{{Redirect|NaschNash|the other character who used the name "NaschNash" as an alias|[[Dumon]]}} {{Redirect|Reginald|the ''[[Yu-Gi-Oh! GX]]'' character|[[Reginald Van Howell III]]}} {{Redirect|Shark|the [[archetype]]series|[[Shark (archetypeseries)]]}} 

| caption =

| nicknames = 

 | ja_name = {{Ruby|神|かみ}}{{Ruby|代|しろ}} {{Ruby|凌|りょぁりょう}}{{Ruby|牙|が}}

| other_names = * Nasch Nash (ナッシュ ''Nasshu'')

* "Shark" Kamishiro<ref>{{cite web|url=http://affiliate.zap2it. com/tv/yu-gi-oh-zexal/cast/EP01482633|accessdate=September 1, 2012|title=''Yu-Gi-Oh! ZEXAL'' Cast|publisher=ktla.com|archive-url=http://web.archive.org/web/20151106193132/https://affiliate.zap2it.com/tv/yu-gi-oh-zexal/cast/EP01482633|archive-date=November 6, 2015}}</ref>

| height = 164 cm<ref>Calculated from {{cite web|url=http://40.media.tumblr.com/536927e46afc80f3421681c5b566354a/tumblr_n37ishvPTv1sitde3o1_1280.png|title=Main Character Comparison Sheet}}</ref>| age = 14 (human form)<ref name="ep53">{{episode|Yu-Gi-Oh! ZEXAL|53|ref}}</ref>

| least_favorite_food = 

 | relatives = * [[Mr. Kastle]] (father; deceased)* [[Mrs. Kastle]] (mother; deceased)

| result1 = Runner-upDisqualified

| result3 = Dropped outSubstituted| team = * Too Cool and The Fool (DubEnglish)<ref name="ep81">{{episode|Yu-Gi-Oh! ZEXAL|81|ref}}</ref>* Irattokuru Kattobingu Team (イラッとくるかっとびんぐチーム ''Irattokuru Kattobingu Chīmu'') <ref name="ep81" />| anime_deck = * Xyz [[WATER]]<ref name="ep53"/>(anime deck name)* [[Shark (archetype)|Shark]]

| en_voice = {{voice actors|en|Gary Mack}}<ref>{{cite web |title=Reginald "Shark" Kastle Character Profile |url=https://yugioh.com/characters/shark |website=Official Yu-Gi-Oh! Site |access-date=15 June 2022 |language=en}}</ref>

'''Reginald Kastle''', known as '''Ryoga Kamishiro''' ({{Ruby|神|かみ}}{{Ruby|代|しろ}} {{Ruby|凌|りょぁEりょう}}{{Ruby|牙|が}}, ''Kamishiro Ryōga'') in the manga and Japanese version and nicknamed "'''"Shark"''' " (シャーク, ''Shāku'') in all versions, is one of the main characters in ''[[Yu-Gi-Oh! ZEXAL]]''. He is one of [[Yuma Tsukumo]]'s close friends and rivals. He was originally an arrogant and callous person, but has grown quite humble. He is later revealed to be the reincarnation of '''NaschNash''' (ナッシュ, ''Nasshu''), the leader of the [[Seven Barian Emperors]]. Determined to not let tragedies befall his people again, he betrayed Yuma and his friends to safeguard the [[Barian World]]. == Design == === Appearance ===He is the only Barian Emperor not to be absorbed by Don Thousand, as well as the only Barian whose original memories were not altered. He later vanished after losing to Yuma in a Duel that had the Human, Astral and Barian Worlds at stake. He, along with the [[Seven Barian Emperors]], were revived by the [[Numeron Code]].

Shark has dark blue eyes, pale skin and dark purple hair, which resembles tentacles hanging down, referencing his [[Deck]] theme of aquatic creatures. These "tentacles" slightly resemble pigtails, but curl up on the end. He also has a light blue "crown" in front of his forehead. His accessories include a grey, shark tooth-shaped locket, which contains a family photo of his parents, as well as himself and his sister [[Rio Kastle]] as children. He also has a scar on his right shoulder.<ref name="ep114">{{episode|Yu-Gi-Oh! ZEXAL|114|ref}}</ref> He also wears [[Kastle twins' rings|two grey rings]] on his right hand, but he later gives one to Rio.<ref name="ep78" /> He also owns a grey and green [[Duel Gazer]] with a red lens and a yellow spike as well as a blue [[D-Pad]]. Upon regaining his Barian identity as NaschNash, he threw away the locket and replaced it with his own [[Barian Emblem]] pendant, though he regained the locket after his revival.<div style="float:right">[[File:NashLineart.jpg|thumb|140px|right|Nash's lineart]]</div>

[[File:True nasch1nash1.png|thumb|180px|left|Shark's true form as '''NaschNash'''.]]As a Barian, he has a magenta skin tone and red and blue heterochromatic eyes with aqua markings on his face. He wears a crimson cape and copper-colored guards on the wrists, shoulders, and his legs are tipped with red stones and also wears a 'H'-shaped belt. The Barian Emblem pendant, becomes larger and is engraved onto his chest. His tentacle-like hair gains more volume and he also wears a copper-colored crown piece with a red jewel on his forehead.

During his past life, Nasch Nash wore golden armor over a mesh shirt, gauze on his left arm, a light brown shirt, silver pants, a blue cape, and the original [[Barian Emblem]] on his chest in the form of a pendant.

<div style="float: right; ">{{triple image| right<!-- -->|SharkfullKing Nasch.png jpg | 106<!--145 -->|King NaschSharkfull.jpg png | 145<!--106 -->|Nasch FullForm.jpg | 144<!-- |Full-->|body view of Shark in his past, present, past, and Barian forms.

=== Personality === Shark can be classified as a typical loner, being indifferent and cool about most things, usually sporting a stoic face or scowl. He prefers to be alone and doesn't follow a crowd, as his encounters with Yuma and others are often brief before he walks off. He also has displayed little interest in school, having had stopped going to [[Heartland Academy]] after his loss to Yuma.<ref name="ep10" /> He still skipped class regardless when he decided to come back and would idly spend his time on the school's roof, but is said to be good at studying.<ref name="ep22" /> Despite Shark's aloof and cold nature, many students at school respect his Dueling skills and he's secretly popular with female students,<ref name="ep50" /> however Rio mentions that he is still disliked and feared by other students.<ref name="ep79">{{episode|Yu-Gi-Oh! ZEXAL|79|ref}}</ref> Shark is shown to have a soft side, but has only shown it to two people - his sister and Yuma. Regardless of this, he can be insensitive and callous to both, causing fighting and arguing between them, especially when Rio brings up his strange fear of onions.

After being disqualified from the [[National Duel Circuit]], Shark became bitter and uncaring, the way he held himself at the beginning of the series. Cold and malicious, Shark flaunts his power by taking the Decks of the people he defeats, making them squirm in the process, such as when he defeated [[Bronk Stone]].<ref name="ep1" /> When he becomes possessed by the "[[Number]]s", he becomes quite violent, destroying the scenery surrounding him throughout his first Duel against Yuma, and also defeating several Duelists brutally when he was briefly possessed by "[[Number 32: Shark Drake (anime)|Number 32: Shark Drake]].<ref name="ep2" /><ref name="ep46">{{episode|Yu-Gi-Oh! ZEXAL|46|ref}}</ref>

Shark's friendship with Yuma also helped him in handling the "Numbers" cards. When "[[Number 17: Leviathan Dragon (anime)|Number 17: Leviathan Dragon]]" came in contact with him, it easily took hold of him.<ref name="ep1" /> However, he was able to fight off the influence of "[[Number 32: Shark Drake]]" because of his bond with Yuma, making him the first known person to be able to resist the influence of the "Numbers" without a special item or power. Despite being able to initially resist the influence, [[Vetrix]] said that it did infect him and it will amplify his darkness caused by his desire to take revenge against [[Quattro]].<ref name="ep33" /> However, after a Duel with Yuma, and seeing his bumbling antics, the darkness had disappeared.<ref name="ep46" />

However, after accepting his fate as a Barian, he adopted his cold personality again, saying that fate drew him and Yuma together to fight against one another. Unable to consider peace as an option despite his friendships with Astral and Yuma, he attacked Earthwith the other Barian Emperors. He is shown to act ruthless when Dueling, as shown during his Duel with Quattro. Throwing himself fully into his Barian persona, he incited his opponent's anger, wanting to be hated and aiming to make both himself and Quattro forget about his time as "Reginald".<ref name="ep125" /> However, it was shown he was doing this to protect the people of the Barian World. Also when [[Girag]] appeared to be in danger, Nasch Nash immediately attempted to rescue him, showing he cares for many, if not all of the Barian Emperors (with the obvious exception of Vector).<ref name="ep128">{{episode|Yu-Gi-Oh! ZEXAL|128|ref}}</ref> He even burst into tears at witnessing Dumon's death.<ref name="ep132">{{episode|Yu-Gi-Oh! ZEXAL|132|ref}}</ref> He also expresses sadness at Mizar's death.<ref name="ep138">{{episode|Yu-Gi-Oh! ZEXAL|138|ref}}</ref>

After ===Abilities===During his Duel against Quattro in the World Duel against [[Vector]]Carnival, Shark gained the ability to see [[Astral]].<ref name="ep72">{{episode|Yu-Gi-Oh! ZEXAL|72|ref}}</ref> Shark also merges his soul with his "[[Number]]", gaining the ability to perform [[Chaos Xyz Evolution]] with "[[Number 32: Shark Drake (anime)|Number 32: Shark Drake]]", acquiring a purple aura while doing so.<ref name="ep58">{{episode|Yu-Gi-Oh! ZEXAL|58|ref}}</ref><ref name="ep70">{{episode|Yu-Gi-Oh! ZEXAL|70|ref}}</ref> After the Duel against [[Vector]], Shark gained the ability to see [[Astral]].<ref name="ep72">{{episode|Yu-Gi-Oh! ZEXAL|72|ref}}</ref> He is also able to resist the "Numbers" influence after repeated exposure, no longer feeling the effects even from a "[[Number C32: Shark Drake Veiss(anime)|Chaos Number]]".<ref name="ep75ep78">{{episode|Yu-Gi-Oh! ZEXAL|7578|ref}}</ref><ref name="ep78ep75">{{episode|Yu-Gi-Oh! ZEXAL|7875|ref}}</ref>

[[File:NaschLightningBolt.png|left|200px|thumb|Nash fires a lightning bolt.]]Shark has also demonstrated a few unique abilities: like his sister, he could generate a red aura around his body. The power of this aura fixed [[Dumon]]'s [[Baria Crystal (jewelry)|Baria Lapris Crystal]] and allowed him to regain his Barian form.<ref name="ep99">{{episode|Yu-Gi-Oh! ZEXAL|99|ref}}</ref> After recovering his Barian identity and powers, Nasch Nash no longer uses his mechanical Duel Gazer when he Duels; instead, his left eye acts as one. He can travel and teleport between dimensions almost instantly. He can also generate viewing screens connected to various places. Like all other Barians, he has the ability to perform a [[Barian Battlemorph]].<ref name="ep124">{{episode|Yu-Gi-Oh! ZEXAL|124|ref}}</ref> He can also perform a [[Barian's Chaos Draw]], a power which he also granted to the other Barian Emperors. Unlike the other Emperors, he is shown to be able to perform more than one Barian's Chaos Draw in a single Duel.<ref name="ep125">{{episode|Yu-Gi-Oh! ZEXAL|125|ref}}</ref><ref name="ep136">{{episode|Yu-Gi-Oh! ZEXAL|136|ref}}</ref><ref name="ep137">{{episode|Yu-Gi-Oh! ZEXAL|137|ref}}</ref> As the leader of the Barians he is extremely powerful, being able to even break free from the area Don Thousand bound him in after he got sufficiently enraged.<ref name="ep133">{{episode|Yu-Gi-Oh! ZEXAL|133|ref}}</ref> He is also able to fire electric bolts, as seen when he attempted to hit Vector with it.<ref name="ep136">{{episode|Yu-Gi-Oh! ZEXAL|136|ref}}</ref>

=== Etymology ===His Japanese name "Ryouga" is homophone with the word "superior" and also contains the word "fang"(牙) which may reflects his nickname "Shark" while his surname means "Age of the gods". His English dub name "Reginald" means "powerful ruler" while his surname is corruption of the word "castle".

== Biography == === History === ==== Past life ====[[File:Ryoga & Rio.png|right|200px|thumb|Reginald and Rio as Nash and Marin, respectively, in their past lives.]]Originally born as Nash, he was once the ruler of the [[United Lands of the Poseidon Ocean]] alongside his sister, [[Rio Kastle|Marin]] and was well-loved by his people. One day, his kingdom was attacked by [[Vector]], who led a [[Vector's army|fleet of ships]] and several "[[Gorgonic Guardian (anime)|Gorgonic Guardian]]s" to lay waste to it and loot it.<ref name="ep108">{{episode|Yu-Gi-Oh! ZEXAL|108|ref}}</ref> Nash ordered a counterattack, arming his soldiers with [[mirror shield]]s which turned the gorgons' abilities against them. Vector performed a blood sacrifice in response, calling forth the ocean god, [[Abyss (character)|Abyss]], turning the tide of the battle again. Marin rode up to Abyss and was grabbed by him. Despite the intervention of Nash's friend, a knight named [[Dumon]], Marin did not want to be saved and sacrificed herself to call forth [[Number 94: Crystalzero (character)|another god]] to purify Abyss.<ref name="ep109">{{episode|Yu-Gi-Oh! ZEXAL|109|ref}}</ref>

[[File:Ryoga & Rio.png|right|200px|thumb|Reginald and Rio as Nasch and MeragAfter Marin's funeral, respectivelyNash declared an attack on Vector's kingdom in retribution, in their past lives.]]Originally born as Nasch, he was once the ruler of latter has fled with the [[United Lands of the Poseidon Ocean]] alongside his sister, [[Rio Kastle|Merag]] and was well-loved by his peoplegod turned to Nash's side. One day, his kingdom was attacked Once they got to a town ravaged by [[Vector]], who led a [[Vector's army|fleet of ships]] and several "[[Gorgonic Guardian]]s" to lay waste to it and loot it, Nash noticed a little girl crying, who strongly resembled Marin.<ref name="ep108ep119">{{episode|Yu-Gi-Oh! ZEXAL|108119|ref}}</ref> Nasch ordered a counterattackNash took the young girl, arming his soldiers with [[mirror shieldIris]], under his care and wondered if she was his deceased sister's which turned reincarnation or if she was sent by Marin herself. As Nash and his army pursued Vector, Nash grew close to Iris and planned to confront Vector by himself once the gorgons' abilities against thembattle started. On war front, Nash followed Vector performed to a blood sacrifice secret tunnel in response, calling forth the ocean godwhat would eventually become a [[Number ruins]], where Vector challenged him to a [[Abyss (character)|AbyssShadow Game]]. Per the Duel's rules, turning the tide more monsters of either ruler that were sent to the Graveyard, the battle againmore soldiers their army would lose. Merag rode up Though Nash was victorious, his entire army was lost due to Abyss and was grabbed by him. Despite the intervention of NaschVector's friend, a knight named [[Dumonmill]], Merag did not want strategy. Their souls were sent to be saved and sacrificed herself to call forth the [[Number 94: Crystal Zero (character)|another godBarian World]] to purify Abyss.<ref name="ep109ep120">{{episode|Yu-Gi-Oh! ZEXAL|109120|ref}}</ref> Vector barely survived and limped back to his own country, prompting Nash to follow him. There, he found Vector had killed all of his own people.<ref name="ep136" /> He also witnessed Vector being dragged to the afterlife by the people he murdered.<ref name="ep138" />

After Merag's funeral, Nasch declared an attack on Vector's kingdom in retribution, as the latter has fled with the god turned to Nasch's side. Once they got to a town ravaged by Vector's army, Nasch noticed a little girl crying, who strongly resembled Merag.<ref name="ep119">{{episode|Yu-Gi-Oh! ZEXAL|119|ref}}</ref> Nasch took the young girl, [[Iris]], under his care and wondered if she was his deceased sister's reincarnation or if she was sent by Merag herself. As Nasch and his army pursued Vector, Nasch grew close to Iris and planned to confront Vector by himself once the battle started. On war front, Nasch followed Vector to a secret tunnel in what would eventually become a [[Number's Ruins]], where Vector challenged him to a [[Shadow Game]]. Per the Duel's rules, the more monsters of either ruler that were sent to the Graveyard, the more soldiers their army would lose. Though Nasch was victorious, his entire army was lost due to Vector's [[mill]] strategy. Their souls were sent to the [[Barian World]].<ref name="ep120">{{episode|Yu-Gi-Oh! ZEXAL|120|ref}}</ref> [[File:Merag And Nasch Souls Reborn.png|thumb|left|200px|NaschNash's and [[MeragRio Kastle|Marin]]'s souls being sent to Earth in the bodies of [[Reginald Kastle (original)|Reginald]] and [[Rio Kastle (original)|Rio]].]]An unknown number of years later, [[Don Thousand]] reincarnated both he and his sister as two of the [[Seven Barian Emperors]], as their souls were each connected to a [[Legendary Mythyrian Number|Legendary Mythyrian "Number"]] card, which had sealed Thousand's power.<ref name="ep129">{{episode|Yu-Gi-Oh! ZEXAL|129|ref}}</ref> Nasch Nash then became the leader of the [[Seven Barian Emperors]], much to Vector's chagrin disdain (also having been reborn as a Barian Emperor). After Nasch Nash had annoyed him enough to score 100,000,000 (1,000,000 in the dub) points, Vector enacted his revenge by taking Merag Marin hostage. When Nasch Nash intervened, Vector used "[[Great Giant Sky Sword of the Heavens]]" to open a bottomless rift. He and then pushed Merag Marin from the cliff, forcing Nasch Nash to follow dive after her , only for the two to be sucked into the rift. The two were rescued by Abyss, who informed them that he would send them to the Human World without their memories, where their souls were then revived in the bodies of [[Reginald Kastle (original)|Reginald]] and [[Rio Kastle (original)|Rio Kastle]], both who had recently died were pronounced dead in a car accident.<ref name="ep131">{{episode|Yu-Gi-Oh! ZEXAL|131|ref}}</ref> While Vector believed them dead,<ref name="ep109" />, Dumon believes believed they had simply disappeared and assumed leadership of the group from them in the interim, waiting for their return.<ref name="DurbeInfo">{{citewebcite web|url=http://www.tv-tokyo.co.jp/anime/yugioh-zexal/images/chara_barian.png|title=TV Tokyo's Barian profile|publisher=tvtokyo.com}}</ref>

At another time, Reginald and Rio visited a theme park. While there, Rio obtained [[Kastle twins' rings|a pair of matching rings]] they could wear together. Reginald refused her offer to wear one, and she walked off in anger, calling him an "idiot" and tossing the rings to the ground.<ref name="ep78">{{episode|Yu-Gi-Oh! ZEXAL|78|ref}}</ref>

After this ban, Reginald became a delinquent and began to steal the Decks of his opponents once he beat them. It is known by most students within [[Heartland Academy]] that Reginald was not only a skilled Duelist, but also a bully.<ref name="ep1">{{episode|Yu-Gi-Oh! ZEXAL|1|ref}}</ref> He obtained the nickname "Shark", due to the fact that he used an ocean-themed Deck and because he ripped his opponents' Decks out of their hands swiftly and with malice. Despite Shark's actions, [[Yuma Tsukumo]] defended him, as he believes that everyone has done something in their past which they regret.<ref name="ep12">{{episode|Yu-Gi-Oh! ZEXAL|12|ref}}</ref> === Yu-Gi-Oh! ZEXAL === ==== Pre-World Duel Carnival ==== 

 They Dueled in the city square, with Shark quickly gaining an advantage with "[[Big Jaws (anime)|Big Jaws]]" and "[[Aqua Jet (anime)|Aqua Jet]]". He cornered Yuma, but then the "[[Number]]s" were released from [[the door]]. Shark was possessed by "[[Number 17: Leviathan Dragon (anime)|Number 17: Leviathan Dragon]]", which he proceeded to [[Xyz Summon]].<ref name="ep1" /> As the Duel progressed, Shark began to toy with Yuma, taking his [[Life Points]] down to a small fraction. However, Yuma managed to come out of this with the help of [[Astral]], and managed to defeat Shark with his "[[Number 39: Utopia (anime)|Number 39: Utopia]]" at 5000 [[ATK]], which knocked Shark out. When Shark awoke, he gave Yuma Bronk's Deck, keeping his promise. Shark said that Yuma was different than everyone that he has faced before and walked off without another word (in the dub, Shark says "You may have a point till then, Yuma").<ref name="ep2">{{episode|Yu-Gi-Oh! ZEXAL|2|ref}}</ref>

Sometime after the Duel, words of Shark's defeat spread around school and his reputation dropped. Eventually, he stopped going to school and also quit Dueling, and was taken in by a gang led by [[Scorch]] and [[Chills]], who hung out at an [[Heartland Arcade|abandoned arcade]]. One night, Shark was riding on his motorcycle, and stopped after seeing Yuma, staring at him before riding off.<ref name="ep8">{{episode|Yu-Gi-Oh! ZEXAL|8|ref}}</ref> One day, while Yuma was late to school, Shark drove across a road on his motorcycle and nearly hit Yuma. After Yuma is belittled by his friends who believe that his victories over Shark and [[Flip Turner|Flip]] were just because of his "[[Number]]s", he decided to find Shark and challenge him to a rematch, without using the help of [[Astral]] or his Numbers. When Scorch and Chills nearly hurt Yuma and his friends, but Shark told them to stop by saying he knows them. After the gang let Yuma go, he challenged Shark, he refused to Duel as his previous loss to Yuma caused him to give up Dueling. Yuma proceeded to chase Shark and annoy him by requesting a Duel until he accepted, Yuma bet [[Emperor's Key]] on the result. Yuma did not use his "Numbers" and Shark told him to do so, believing a victory over Yuma without "Numbers" would be meaningless. Yuma Summoned "Utopia", which Shark weakened with "[[Friller Rabca(anime)|Friller Shark]]". This let "[[Black Ray Lancer (anime)|Black Ray Lancer]]" [[negate]] its effects and destroy it, which impressed Astral. Shark won with a [[direct attack]] from "[[Submersible Carrier Aero Shark (anime)|Submersible Carrier Aeo Shark]]". Shark took the Emperor's Key, but threw it on the ground as he walked off after he remember what Yuma said about being friends. Before driving away, Shark told Yuma that Scorch and Chills gives him a place to belong and told him not be bother him again.<ref name="ep10">{{episode|Yu-Gi-Oh! ZEXAL|10|ref}}</ref>

Shark soon overheard Scorch and Chills' plot of raiding the Heartland museum in hope of trying to steal a valuable Deck containing "[[Chaos End Ruler -Ruler of the Beginning and the End-]]". He also shocked to discovered that both thugs were possessed by "Numbers". When Chills and Scorch found Shark listening on their plan, he was forced to go along with them, even though he knew this plan was dangerous. Before going, he tells another gang member, [[Weasel]], to run so he doesn't become involved in the dangerous raid, but Weasel went and warned Yuma of the situation instead. Upon arriving at the museum, they found Yuma standing in their way, not allowing them to pass without beating him in a Duel first. He was shocked when Yuma bet his "Number 39: Utopia" on the Duel. Shark warned Yuma not to be concerned for him, but Yuma said he won't leave him alone to rob the Deck. Yuma also pointed out that Scorch and Chills were using him, and that their hideout is not a place for him and insisted that he and Shark were comrades. Shark then decided to Duel with Yuma against Scorch and Chills in a 2-on-2 [[Tag Duel]]. On his first move, he Xyz Summoned "Submersible Carrier Aero Shark" and managed to deal [[effect damage]] to Scorch. Scorch Xyz Summoned "[[Number 61: Volcasaurus (anime)|Number 61: Volcasaurus]]" and [[activate]]d its effect, which destroyed "Submersible Carrier Aero Shark" and dealt Shark damage equal to the ATK of "Aero Shark".<ref name="ep11">{{episode|Yu-Gi-Oh! ZEXAL|11|ref}}</ref>

 Having all their moves countered and with the appearance of "[[Number 19: Freezadon (anime)|Number 19: Freezadon]]", which gave "Volcasaurus" its [[Xyz Material|Overlay Units]] back, Shark and Yuma were pushed into a corner. After Summoning "Utopia" and having it rendered unable to attack by Chills' "[[Avalanche]]", Yuma used its effect to protect Shark from attacks which would have caused Shark to lose. After having "Utopia" and the newly Summoned "Black Ray Lancer" destroyed by "Volcasaurus" (avoiding losing by "[[Damage Diet (anime)|Damage Diet]]"), Shark narrowly avoids losing from a direct attack by using the trap "[[Final Offering]]", ending the [[Battle Phase]] and giving Yuma "[[Armored Xyz (anime)|Armored Xyz]]". After eliminating Chills by forcing him to use his "[[Compensation Exchange]]" Trap, which saved "Volcasaurus" by taking damage equal to its ATK, Yuma used "[[Monster Reborn (anime)|Monster Reborn]]" to bring back Shark's "Black Ray Lancer" and equip it with the "Armored Xyz" Shark had entrusted to him earlier. It allowed him to give "Lancer" the properties of "Utopia", letting it destroy "Volcasaurus" and attack directly for the win. Afterwards, Shark commented that his card was able to improve Yuma's game, allowing him to keep it before smiling and walking off.<ref name="ep12">{{episode|Yu-Gi-Oh! ZEXAL|12|ref}}</ref>

 Just when Orbital 7 was about to kill him with a drill, [[Kite Tenjo]] stepped in and called a halt. Shark and Kite both chatted a little about their connection to Yuma, and Shark refused to give Yuma's key to him. After hearing Kite mention the "[[Numbers]]" cards, Shark realized he is the "Number Hunter" and then lied to Kite about having a "[[Number]]" card, then a Duel is started over the possession over [[Emperor's Key]]. Shark was confident about his Deck's new Anti-"Numbers" strategy, which proved effective against Yuma. However, he still wanted to have a "Number", so he planned to steal Kite's "Numbers", but Kite noticed it and used "[[Number 30: Acid Golem of Destruction (anime)|Number 30: Acid Golem of Destruction]]" so that its negative effects damage Shark when he steals it. Shark remembered that Yuma would never give up, grasped the key and continued the Duel. When Shark lost, he apologized to Yuma being that he failed to protect the [[Emperor's Key]]. Shark's soul was taken by [[Photon Hand]], causing him to he age considerably and become comatose. However, Kite was surprised that the soul didn't possess a "Number" card, but still took his soul when Yuma arrived.<ref name="ep22">{{episode|Yu-Gi-Oh! ZEXAL|22|ref}}</ref>

==== World Duel Carnival Preliminaries ==== 

At the beginning of the [[World Duel Carnival]], he met Yuma, who was panicking because he didn't have a [[Heart Piece]]. When he was asked if he would be participating, Shark replied he didn't feel like it. When he drove down the road a bit further, he caught a thrown "[[Mirror Force (later anime)|Mirror Force]]" card, the card that Shark associated with his ban from the National Circuit, and it turned out to be [[Quattro]], his opponent in his last pro Duel. Quattro explained he purposely put his Deck where Shark could see it, to get him disqualified.<ref name="ep26" />

Quattro also revealed that at that time Shark was not only affected by the pressure of the Finals, but also because of a promise he made to his sister who had an accident and was hospitalized, so he was easily tempted to look at Quattro's Deck,.Quattro also says that maybe his sister's accident was not really a coincidence. Infuriated, Shark demanded to Duel with him again, but Quattro told him to wait for the WDC and tossed him a Heart Piece before departing. Shark then decided to participate after all, to get his rematch with Quattro. He fell into Quattro's trap again as [[Vetrix]] told him to coerce Shark into participating in the carnival.<ref name="ep26" /> After [[Kari Tsukumo]] ordered Yuma to find [[Charlie McCay]], he overheard a crowd cheering. Knowing that it would be a Duel, Yuma ran over to see Shark defeat an unknown Duelist with "[[Submersible Carrier Aero Shark (anime)|Submersible Carrier Aero Shark]]". After the Duel, Yuma congratulated Shark and asked him why he had decided to enter the WDC. Shark told Yuma about how Quattro had mistreated his sister into the hospital to trick him into being kicked out of the nationals, and now he wants a rematch with Quattro, but after that, he will quit the WDC. Shark then told Yuma not to get involved with him and then wandered off, vanishing from sight of Yuma and [[Tori Meadows|Tori]].<ref name="ep31">{{episode|Yu-Gi-Oh! ZEXAL|31|ref}}</ref>

 During the second day of the WDC, after Quattro defeated [[Bronk Stone|Bronk]] and [[Caswell]] in a [[Battle Royal]] Duel, Shark charged into the area on his motorbike, asking him if he remembered the face of his "Number one fan".<ref name="ep33">{{episode|Yu-Gi-Oh! ZEXAL|33|ref}}</ref> Quattro agreed to Duel Shark, but [[Trey]] snared Shark with his [[Duel Anchor]], preventing the Duel and saying that [[Vetrix]]'s orders are absolute. Quattro left in a cloud of dust. In the proceeding Duel, Shark takes control of Trey's "Number" monster, "[[Number 32: Shark Drake (anime)|Number 32: Shark Drake]]". The "Number" pierced his claws into Shark's chest, but Shark's strong will and connection to Yuma overcame the power of the "Number" and he used it to defeat Trey. Trey told him to keep the card and gave him a Heart Piece, revealing that he himself already had a completed heart. When Shark was about to leave, he once again told Yuma not be get involved with him and rode off. Although he was able to withstand the "Numbers" by remembering his time with Yuma, Shark still wanted his revenge against Quattro for his sister, which allowed "Shark Drake" to infect Shark with a small virus (blue in the dub) that will amplify that darkness even further. According to [[Vetrix]], this will help them with their plan to use Shark.<ref name="ep34">{{episode|Yu-Gi-Oh! ZEXAL|34|ref}}</ref>

 When Yuma, Tori, and Astral were looking for [[Hart Tenjo]], Shark saw them from the road above them and stopped. He overheard Yuma calling out for Kite with his [[D-Gazer]], leaving him wondering about situation.<ref name="ep41">{{episode|Yu-Gi-Oh! ZEXAL|41|ref}}</ref> During the third day of the WDC, Shark continued to collect Heart Pieces and brutally defeating many Duelists as the power of "Number 32" began to exert its influence on him, fueling his desire for revenge even more. He was confronted by Yuma, who let Shark take his anger out on him in a Duel. Realizing this, Shark eventually came to his senses, with the darkness of the "Number" disappearing and cancelled the Duel. Before he walked off, he told Yuma that they would meet in the finals and gave him a smile.<ref name="ep46">{{episode|Yu-Gi-Oh! ZEXAL|46|ref}}</ref>

Shark attended the party that [[Mr. Heartland]] threw for the finalists, but he spent the entire time outside the building. He turned to leave when [[Quattro]] caught a glimpse of him through a window. Quattro ran to confront him, with Shark turning his back and telling Quattro he will gamble with everything he has in order to defeat him. After that, he left the party and rode off on his motorcycle.<ref name="ep50">{{episode|Yu-Gi-Oh! ZEXAL|50|ref}}</ref> The next day, the [[Duel Coaster]] began, and Shark easily defeated [[Green Coat Duelist|an opponent]] with "[[Jawsman (anime)|Jawsman]]" before seeing [[Quattro]] Dueling [[Mustached Duelist|another Duelist]] on a nearby track. Quattro told him that he was fighting magnificently, which Shark vowing not to let Quattro get away and chased after him after the latter defeated his own opponent.<ref name="ep51">{{episode|Yu-Gi-Oh! ZEXAL|51|ref}}</ref> The chase continued into the underground section of the Duel Coaster, with Shark and Quattro [[Sultan of Spells|both]] [[Conical Hat Duelist|defeating]] opponents and taunting one another. Quattro used Shark's anger against him by leading him toward the "[[Duel Field|Magma Field]]". Since Shark's Deck was composed of [[WATER]] monsters, he would be at a disadvantage.<ref name="ep53">{{episode|Yu-Gi-Oh! ZEXAL|53|ref}}</ref>

[[File:PreviewZEXAL57SharkvQuattro57.png|thumb|200px|right|Shark vs. Quattro.]] Shark was prepared to counter the field, "[[Magma Field]]", using cards such as "[[Plate Salvage]]" and "[[Adapt to Adversity]]". He brought out "[[Submersible Carrier Aero Shark (anime)|Submersible Carrier Aero Shark]]" on his first turn, inflicting 1200 [[effect damage|damage]] to Quattro before he takes his first turn. Quattro countered with "[[Number 15: Gimmick Puppet Giant Grinder (anime)|Number 15: Gimmick Puppet Giant Grinder]]", which Shark countered with "[[Number 32: Shark Drake (anime)|Number 32: Shark Drake]]". [[Vetrix]] appeared, revealing that he intended to use Shark as an assassin to defeat [[Dr. Faker]]. Shark insisted that won't happen, with Vetrix responding that he'll have no choice - he will become Vetrix's puppet. After Quattro managed to Summon "[[Number 40: Gimmick Puppet of Strings (anime)|Number 40: Gimmick Puppet of Strings]]" and using the effect of "[[String of Destiny]]", Quattro attacked Shark a total of eight times.<ref name="ep57">{{episode|Yu-Gi-Oh! ZEXAL|57|ref}}</ref> Quattro revealed that he had been manipulated by Vetrix and that Shark's sister was hospitalized as a result of a fire caused by "[[Flaming Hell Blessing]]". [[File:Shark's New Power.jpg|thumb|200px|left|Shark gives in to the power of the "Number".]]Shark told him not to act like he was the victim, even if he was used by Vetrix, Quattro was still responsible. Quattro Summoned "[[Number 88: Gimmick Puppet of Leo (anime)|Number 88: Gimmick Puppet of Leo]]", which would let him declare an [[Automatic Win]] on his next turn. Vetrix advised Shark to accept "Shark Drake" in order to win and have his revenge. After some resistance, Shark gave in to and was able to create "[[Number C32: Shark Drake Veiss (anime)|Number C32: Shark Drake Veiss]]" as a result. He defeated Quattro, with Vetrix musing that now he and Shark are friends, mocking Yuma's spirit of "[[kattobingu]]". Quattro apologized for hurting his sister and urged Shark to defeat his [[Vetrix|father]] and save him. Quattro also added that if Shark wanted to hate someone, he should hate Quattro, not Vetrix. Shark watched as Quattro departed through a portal and talked with Yuma. Now wanting revenge against Vetrix as well, Shark told Yuma he would not forgive him if he got in the way. He boarded his Duel Coaster and moved on, having advanced to the semi-finals.<ref name="ep58">{{episode|Yu-Gi-Oh! ZEXAL|58|ref}}</ref> [[File:TronSharkhandface.jpg|right|200px|thumb|Vetrix makes Shark his assassin (this scene is cut from the dub).]]

 Shark turned up for the finals at the [[Duel Tower (ZEXAL)|Duel Tower]] for his Duel against Yuma, but, because of Vetrix's powers, Shark was emotionless. This affected his Dueling as Yuma was able to gain a massive advantage over him by his second turn. However, this was short-lived as Vetrix then began to show Shark visions of Yuma and [[Dr. Faker]] causing his sister, Rio to be hospitalized. With a dark revenge in his heart, Shark began to relentlessly attack Yuma with his "[[Spear Shark (anime)|Spear Shark]]" and "[[Double Shark (anime)|Double Shark]]" in combination with "[[Zeus Breath]]", dropping Yuma's Life Points in an instant. He then managed to Summon "Number 32: Shark Drake", cornering Yuma further while the power of Vetrix's [[crest]] glowed on Shark's hand.<ref name="ep61">{{episode|Yu-Gi-Oh! ZEXAL|61|ref}}</ref> At the climax of the Duel, Yuma took control of "Shark Drake Veiss", causing Vetrix to lose his hold on Shark. Vetrix was about to establish the same control over Yuma, but Shark came to his senses before it could fully happen. Vetrix appeared before Shark and tried to convince him to save Yuma by using his Set "Heraldry Catastrophe", but Shark refused to submit to Vetrix again, and instead used "[[Underwater Snow Prison]]" to banish "Shark Drake Veiss" at the cost of the remainder of his Life Points, conceding victory to Yuma. Afterwards, Shark thanked Yuma for rescuing him and encouraged him to defeat Vetrix. Due to his injuries, Shark is then carried away via helicopter to be treated.<ref name="ep62"/> During Kite's Duel with Vetrix, the latter revealed that Shark was merely a pawn alongside his progeny and [[Dextra]] in order to bolster his "[[Number 69: Heraldry Crest (anime)|Number 69: Heraldry Crest]]" with rage and hatred as he had no emotions to spare.<ref name="e64">{{episode|Yu-Gi-Oh! ZEXAL|64|ref}}</ref>

 Near the end of Yuma's Duel with Vetrix, Shark awoke, witnessing the [[Sphere Field]] through the window of the hospital. He watched the remainder of the Duel with Vetrix on television, worrying about Yuma. After it ended, he escaped the hospital and rushed to the stadium, witnessing the explosion of the [[Duel Tower (ZEXAL)|Duel Tower]] and the Sphere Field moving towards [[Heartland Tower]].<ref name="e67ep67">{{episode|Yu-Gi-Oh! ZEXAL|67|ref}}</ref> Heading there, Shark encountered [[Tori Meadows|Tori]], [[Kite Tenjo|Kite]], and [[Orbital 7]]. He helped Kite escape from rubble that had fallen on him, and told them his reason for being here. After some arguing, the four agreed to work together and headed to the Sphere Field, but they are stopped by [[Mr. Heartland]], who deployed an army of [[litterbot]]s to stop them. After Orbital destroys a few, Shark, Kite and Tori wielded fallen litterbot weapons to destroy more of them. When [[Astral]] rescued Yuma from the Sphere Field and gave him "Utopia" and "Shark Drake", Yuma returns the latter card to Shark. The three Duelists confronted and challenged Dr. Faker, holding their [[signature card|ace cards]] high.<ref name="e68ep68">{{episode|Yu-Gi-Oh! ZEXAL|68|ref}}</ref>

As the Duel with Faker began, Shark began to bleed from his stomach from when a litterbot slashed him with it's scythe (the blood is cut from the dub). He however continued on, managing to Xyz Summon "Shark Drake" as well as protect Yuma's "Utopia" via the [[Equip Spell Card]], "[[Shield Fin]]". This strategy enabled the three to inflict 5600 damage to Dr. Faker despite the effects of Faker's "[[Number 53: Heart-eartH (anime)|Number 53: Heart-eartH]]". However, Kite mocked Shark for carelessly attacking Dr. Faker without thinking of the consequences, as he received 1400 [[effect damage]] from attacking with "Shark Drake". When they thought Kite had defeated Dr. Faker, Shark was shocked to see Dr. Faker had Summoned another "Number" in place of "Heart-eartH".<ref name="e69ep69">{{episode|Yu-Gi-Oh! ZEXAL|69|ref}}</ref>

As the Duel continued, Faker's new "Number", "[[Number 92: Heart-eartH Dragon (anime)|Number 92: Heart-eartH Dragon]]" continued to torment the trio, even banishing Yuma's "[[Number C39: Utopia Ray (anime)|Number C39: Utopia Ray]]". When it comes to Shark's turn, Dr. Faker avoids losing via a direct attack from "Shark Drake Veiss" through the "[[Fake Life]]". After Shark ends his turn, he falls to the floor in pain as the injury he sustained was worsening. As Kite began his turn, Faker's "Number" banished Shark's "Shark Drake Veiss" and Set card, but while they were being banished, Shark laughed, which shocked Faker. This was because he tricked Faker as his Set card was "[[Xyz Dimension Splash (anime)|Xyz Dimension Splash]]", which allowed him to Summon two "[[Hyper-Ancient Shark Megalodon (anime)|Hyper-Ancient Shark Megalodon]]" from his Deck. He then allowed Kite to use them as Overlay Units to Xyz Summon "[[Neo Galaxy-Eyes Photon Dragon (anime)|Neo Galaxy-Eyes Photon Dragon]]" which reduced Dr. Faker down to 150 Life Points. After the attack, Dr. Faker came clean about his actions and why he committed them. After revealing that [[Vector]] was the one which ordered him to do such things in order to save Hart, Yuma, Kite and Shark decided to go after Vector. However, at this moment, Vector emerged from a portal and possessed Dr. Faker, continuing the Duel by resurrecting "Heart-eartH Dragon".<ref name="e70ep70">{{episode|Yu-Gi-Oh! ZEXAL|70|ref}}</ref>

When Hart freed Astral, letting him and Yuma [[ZEXAL (power)|merge]], Shark's "Shark Drake Veiss" was used to boost Yuma's "Utopia Ray" and help defeat Vector. When the Sphere Field Cannon began to explode, Shark pushed Yuma out of the way of a piece of falling rubble, injuring himself further. Orbital 7 was reactivated and got Hart, Shark and Tori out of the place. After Yuma and the others reemerge, Shark is taken to the hospital in a helicopter piloted by [[Nistro]], while [[Dextra]] administered first aide.<ref name="ep71">{{episode|Yu-Gi-Oh! ZEXAL|71|ref}}</ref> During Kite and Yuma's Duel, Astral mentions that Shark should be able to see Astral due the results of the Duel with Vector.<ref name="ep72">{{episode|Yu-Gi-Oh! ZEXAL|72|ref}}</ref> During Yuma and Kite's rematch, Shark was able to leave the hospital (although his chest was heavily bandaged) and witness their Duel. He looked on from a bridge with a smile, muttering "Yuma, Astral" before riding off on his bike (the scene showing him leaving is cut from the dub).<ref name="ep73">{{episode|Yu-Gi-Oh! ZEXAL|73|ref}}</ref> === Yu-Gi-Oh! ZEXAL II === ==== Barian Invasion ====

One day after school, Shark went to visit Rio in the hospital, but ran into Yuma on the way, who suggested they Duel. Shark apologizes and declines Yuma because told him he had to go see Rio, then he sensed the arrival of [[Girag]]. Getting an urgent call from the hospital about Rio, Shark rushed there with Yuma and Tori to find Rio crying out in pain. The doctor told Shark that Rio's condition had worsened thirty minutes prior. Rio claimed that disaster was coming and that "they" were coming to take the most important thing, though Shark was confused who are "they". Yuma was called away to save his friends from [[Fender]], Shark attempted to follow, but Rio clutched his hand and stopped him.<ref name="ep74">{{episode|Yu-Gi-Oh! ZEXAL|74|ref}}</ref> Later, Shark eventually left the hospital and intercepted part of Fender's gang, while Kite intercepted another part of it. The two defeated all of them and then arrived at [[Heartland Academy]] to inform Fender of his gang's failure and give his support to Yuma to battle against the [[Barian World]].<ref name="ep75">{{episode|Yu-Gi-Oh! ZEXAL|75|ref}}</ref>

While leaving school, Shark was approached by [[Art Stanley]], the founder of the [[Comic Book Appreciation Club]], who wish to used him as model for his comic. He showed Shark his hero character designs that he had based off of Shark, but Shark shrugged him off. When visiting Rio, he gave her one of the rings from their childhood, unknown that Art was spying on him. When Shark heard that Rio's operation was successful, he went to get her when she was discharged, but was met by Art again. Art informed him that he had his sister and that they would have to Duel. Unbeknownst to Shark, Art was working for the Barian World, having become [[Girag]]'s most recent pawn. When Shark attempted to counter one of Art's moves with "[[Zeus' Breath]]", Art threatened Rio and Shark chose not to activate his card. Wanting to face a "[[Number]]", Art gave Shark the components he needed to Summon "Shark Drake", which Shark did. Art countered this by [[Rank-Up|Ranking Up]] his "[[Comics Hero King Arthur (anime)|Comics Hero King Arthur]]" into "[[CXyz Comics Hero Legend Arthur (anime)|CXyz Comics Hero Legend Arthur]]". As Shark remembered the rings from his sister, the power of their bond shattered the Barian's magic and Rio was freed. The bandages flew off of her face and she insulted Shark's Dueling skills as soon as she opened her eyes, to his irritation. Now able to Duel at his best, Shark defeated Art with "[[Number C32: Shark Drake Veiss (anime)|Number C32: Shark Drake Veiss]]". Shark then reunited with his sister and carried her away. Later at school, Shark was shown a samurai-drawing of himself by Art, but he still displayed little interest in it and walked off.<ref name="ep78">{{episode|Yu-Gi-Oh! ZEXAL|78|ref}}</ref>

[[File:WaryShark.jpgpng|left|200px|thumb|Shark, wary that his sister is returning to school.]]As Rio began to return to school, Shark left their house without her and rushed to school. Despite trying to remain unseen, he met up with Yuma, who asked him what's wrong. Shark began to explain what was wrong, but was interrupted by Rio's arrival, with her calling him mean for leaving without her. Later, Shark ate lunch with Rio, Yuma, and his friends atop of a roof, although Shark sat apart from the group. When Rio started to talk about him, Shark cut her off and yelled at her, but stopped once Rio glared at him. After seeing a group of boys and [[Bronk Stone|Bronk]] smitten with Rio, Shark warned them that Rio is an "ice woman" and they will find out what he means soon. Later, Shark secretly watched Rio Duel against [[Lotus Hanazoe]] and goes to her after she wins, calling her Duel "so-so" and asked if she needs any advice from him. While walking home, Shark talks with Yuma about Rio, and then teased her that she hid behind him when she got frightened by a cat, resulting in Rio calling him a "meanie".<ref name="ep79">{{episode|Yu-Gi-Oh! ZEXAL|79|ref}}</ref> When Yuma held a "Friendship Games" as way for his friends and Rio to stop fighting with each other, Shark was somehow dragged into it as well, and reluctantly participated in it. He was paired up with Yuma, and was able to put their team in the lead with his skills in Dueling and sports. However, Shark leaves to go home before he and Yuma could face [[Tori Meadows|Tori]] and [[Cathy Katherine|Cathy]] in the final Duel, leaving Rio and [[Caswell]] to explain his unwillingness to be in the tournament any longer.<ref name="ep81">{{episode|Yu-Gi-Oh! ZEXAL|81|ref}}</ref>

[[File:Shark'ssmilesSmile.jpgpng|right|200px|thumb|Shark smiles as Yuma defeats him.]]Shark and Yuma survived the fall, but they were heavily injured and were sent to hospital, with Shark spending most of his time reading. While recuperating, Shark observed a depressed Yuma and became irritated by his behavior, even yelling at him one at night when he was having a nightmare. When Yuma was out of their shared room, he noticed the [[Emperor's Key]] on Yuma's bed and decided to steal it to lure Yuma into a Duel to help him regain his will. Shark immediately brought out "[[Submersible Carrier Aero Shark (anime)|Submersible Carrier Aero Shark]]" and "[[Black Ray Lancer (anime)|Black Ray Lancer]]", but Yuma responded with defensive plays, angering him. Shark Summoned "[[Shark Fortress (anime)|Shark Fortress]]" and broke through Yuma's defenses, nearly winning. Eventually, Astral appeared to help Yuma out his depression and turned the Duel around, making Shark smiled and graciously lose the Duel to Yuma. Astral pointed out that Shark's reason for doing all that was to help Yuma, though Shark denied it and pushed Yuma away when the latter tried to hug him.<ref name="ep84">{{episode|Yu-Gi-Oh! ZEXAL|84|ref}}</ref>

Once he was discharged from the hospital, Shark went to school and heard Rio sensing a Barian presence again and the two rushed to aide Yuma alongside Tori. They found him surrounded by brainwashed Duelists and helped him Duel his way out until [[Alito]] arrived and ended the [[Battle Royal]]. Afterwards, they watched Yuma begin a Duel with Alito within another Sphere Cube.<ref name="ep85">{{episode|Yu-Gi-Oh! ZEXAL|85|ref}}</ref><ref name="ep86">{{episode|Yu-Gi-Oh! ZEXAL|86|ref}}</ref> [[File:TetsuoasksSharkforaDuelTetsuoAsksSharkforaDuel.jpgpng|right|200px|thumb|Shark tells [[Bronk Stone|Bronk]] to be at least at Yuma's level before challenging him.]]Later at school, Shark was asked by Bronk to Duel him, who was trying to gain his blessings to date Rio, but Shark declined since he was no match for him. He also added that Bronk wasn't even at Yuma's level, causing Bronk to jump to the conclusion that Rio was with Yuma. Flip and Caswell overheard this and spread a rumor around the school. Oblivious to the rumor, Shark was challenged by an angry Rio to a Duel and accepts after she insulted him. During the Duel, Shark was able to counter every strategy Rio played and voiced little faith in Rio's confidence as a Duelist. While Shark was proud that Rio was able to gain courage, he proclaimed that she still has a long way to go if she wanted to beat him and defeated Rio with his "[[Shark Caesar (anime)|Shark Caesar]]". Afterwards, Shark learned the rumor from Rio and cleared up the misunderstanding, clarifying that he wasn't the one spreading the rumor.<ref name="ep91">{{episode|Yu-Gi-Oh! ZEXAL|91|ref}}</ref>

During [[Heartland Academy]]'s Fun Fair, Shark observed the play Rio was acting in and displayed irritation watching her with [[Yata-Garasu (character)|Yata-Garasu]]. When Bronk came to him, Shark was shocked by his cosplay as "[[Gogogo Golem (anime)|Gogogo Golem]]" and grew annoyed that he was calling Shark "brother". Shark's irritation prompted Rio to throw her shoe at Shark and telling him to be quiet or leave. Later, Shark took part in the festival by playing bass guitar alongside his fellow students for the famous singer, [[Scarlett Starling]], much to the excitement of his female admirers.<ref name="ep92">{{episode|Yu-Gi-Oh! ZEXAL|92|ref}}</ref> After "Ray Shadows" was kidnapped by [[Vector]], Shark rushed to Yuma's location and watched his conversation with Kite. Inside [[Heartland Tower]], Shark heard Yuma's explanation, and said that he wanted to go with him to save Ray and find Vector. Shark then bickered with Kite about how to get to the Barian World when the tower shook. They ran to the top to see that the [[Different Dimension Airship]] from the [[Emperor's Key]] had crushed the top of the tower and was resting there. Astral told them that they could use the ship to get to the [[Barian World]]. Later, Shark spoke with Rio about his mission with his friends, and was forced to take Rio along when she wanted to go with him. In the morning, Shark and the group entered the ship and took off, but an array of monsters began assaulting the ship. Shark and the others went to the exterior, using their ace monsters to battle with them until a portal sucked them in. [[File:Shark vs. Durbe.png|thumb|right|Shark vs. Dumon.]] At "[[Sargasso the D.D. Battlefield]]", Shark watched Vector taunting a devastated Yuma with Ray's seemingly dead body, when [[Dumon]] challenged him to a Duel. Shark was given the first turn and quickly Summoned "[[Number 32: Shark Drake]]" and took the damage inflicted by the effect of "Sargasso".<ref name="ep95">{{episode|Yu-Gi-Oh! ZEXAL|95|ref}}</ref> Although he was at an disadvantage, Shark was still confident against Dumon and ended his turn, taking "Sargasso's" damage again, even when Dumon brought out his "Over-Hundred Number", "[[Number 102: Star Seraph Sentry]]". He also listened to Vector revealing that he was really "Ray" all along and boasting how it was so he could plan Yuma's downfall, which Shark showed visible disgust to.<ref name="ep96">{{episode|Yu-Gi-Oh! ZEXAL|96|ref}}</ref>

As the Duel continued, Shark Summoned After "Ray Shadows"was kidnapped by [[Number C32: Shark Drake VeissVector]]", but his Life Points whittle down Shark rushed to 900 due "Sargasso" effect. When Yuma was blaming himself for putting 's location and watched his friends in dangerconversation with Kite. Inside [[Heartland Tower]], Shark told heard Yuma 's explanation, and said that he came on his own will wanted to go with him to save Ray and find Vector. Shark then bickered with Kite about how to get to the Barian World when the tower shook. They ran to the top to see that the [[Different Dimension Airship]] from the [[Emperor's Key]] had crushed the top of the tower and encouraged him was resting there. Astral told them that they could use the ship to get to win the [[Barian World]]. Later, Shark spoke with Rio about his Duelmission with his friends, but and was stunned forced to take Rio along when she wanted to go with him. In the morning, Shark and the group entered the ship and took off, but an array of monsters began assaulting the ship. Shark and the others went to the exterior, using their ace monsters to battle with them until a portal sucked them in. [[File:Shark vs. Durbe.png|thumb|right|Shark vs. Dumon.]] At "[[Sargasso the Different Dimension Battlefield (anime)|Sargasso the Different Dimension Battlefield]]", Shark watched Vector taunting a devastated Yuma with Ray's seemingly dead body, when [[Dumon]] challenged him to a Duel. Shark was given the first turn and Astral transformed into quickly Summoned "[[Dark ZEXALNumber 32: Shark Drake (anime)|Number 32: Shark Drake]]" and took the damage inflicted by the effect of "Sargasso".<ref name="ep97ep95">{{episode|Yu-Gi-Oh! ZEXAL|9795|ref}}</ref> After Yuma undid Dark ZEXALAlthough he was at an disadvantage, Shark helped inform Yuma of his status was still confident against Dumon and paused ended his Duel with Dumon to watch Yuma and Vectorturn, taking "Sargasso's. " damage again, even when Dumon asked him if he still believes that Yuma could winbrought out his "Over-Hundred Number", which Shark said he does because that was trust is all about. After the power surge of "[[ZEXAL IINumber 102: Star Seraph Sentry (anime)|Number 102: Star Seraph Sentry]] caused "Sargasso. He also listened to Vector revealing that he was really "Ray" to self-destruct, Sharkall along and boasting how it was so he could plan Yuma's Duel with Dumon was canceleddownfall, and he returned which Shark showed visible disgust to Heartland with everyone else.<ref name="ep98ep96">{{episode|Yu-Gi-Oh! ZEXAL|9896|ref}}</ref>

As the Duel continued, Shark Summoned "Shark Drake Veiss", but his Life Points whittle down to 900 due "Sargasso" effect. When Yuma was blaming himself for putting his friends in danger, Shark told Yuma that he came on his own will and encouraged him to win his Duel, but was stunned when Yuma and Astral transformed into [[Dark ZEXAL]].<ref name="ep97">{{episode|Yu-Gi-Oh! ZEXAL|97|ref}}</ref> After Yuma undid Dark ZEXAL, Shark helped inform Yuma of his status and paused his Duel with Dumon to watch Yuma and Vector's. Dumon asked him if he still believes that Yuma could win, which Shark said he does because that was trust is all about. After the power surge of [[ZEXAL II]] caused "Sargasso" to self-destruct, Shark's Duel with Dumon was canceled, and he returned to Heartland with everyone else.<ref name=== Legendary Number War ===="ep98">{{episode|Yu-Gi-Oh! ZEXAL|98|ref}}</ref>

Later at school, Shark was skipping class when he felt a strong presence of [[Don Thousand]] when he was revived by Vector. On the roof, Shark, Yuma, Tori and Rio were brought aboard the Different Dimension Airship by [[Astral]], who informed them of the seven Legendary "[[Mythyrian Number]]s" scattered across the world. As they headed to their first location, they ended up crashing into Dumon and the ship landed them into a jungle. After Yuma saved a boy named [[Dumon|NaschNash]] from a bear, Shark inquired who he is. He didn't believe the mysterious, injured boy "NaschNash" was just a "traveler" and stated he might be a [[Barian]]. Shark told Yuma not to trust the boy so easily, but the conversation was cut off when the group hears [[Tori Meadows|Tori]]'s scream from some distance. They ran to a temple where she and Rio were, and had to get rid of the snakes surrounding them. As the group traveled further inside the temple, a trap activated and Shark almost got crushed under a wall, but "NaschNash" saved him and they were separated from the others. When a door opened up, Shark and "NaschNash" went down the pathway, leading them to an empty room. Shark thanked "NaschNash" for saving him, but said he still doesn't trust him, though "NaschNash" shrugged it off and said he did it in return for Yuma saving him. When the walls started to close in, they were captured and their lives depended on the outcome of Yuma's Duel with [[Mach]].<ref name="ep99">{{episode|Yu-Gi-Oh! ZEXAL|99|ref}}</ref> Shark and "NaschNash" were forced to work together to survive the collapsing and changing labyrinth. Following Astral's instructions, they tried to interpret the ruins' legend of a hero and his pegasus in order to find a clue to help Yuma win the Duel. Shark suspicions of "NaschNash's" identity deepens when the latter revealed he could translate the legend. When the floor collapsed, Shark was about fall into the hole, but "NaschNash" was able to grasp his arm. When their hands touched, Shark began to glow and "NaschNash's" [[Baria LapisCrystal (jewelry)|Baria Crystal]] was repaired, revealing "NaschNash" to be Dumon. Although Dumon saved him, Shark urged Yuma not to trust Dumon and to destroy "[[Number 39: Utopia (anime)|Number 39: Utopia]]" instead of protecting it. Using Dumon's advice, Yuma was able to win the Duel and allowed a door to open for Shark to regroup with them.<ref name="ep100">{{episode|Yu-Gi-Oh! ZEXAL|100|ref}}</ref>

Going to South America, Shark and the others arrived at an abandoned castle, and listen to Rio speak of legend about a ruthless prince. After Yuma accidentally triggered some traps, Shark and everyone else ended up inside the cages of the central colosseum. With [[Vector]] and [[Number 96: Dark Mist (character)|Number 96: Dark Mist]] focusing solely on Yuma and Astral, Shark was forced to watch Astral Duel Dark Mist Number 96 and worried about Yuma, who has a giant pendulum axe aimed at him.<ref name="ep101">{{episode|Yu-Gi-Oh! ZEXAL|101|ref}}</ref> After Astral tied with Number 96, Shark and the others were released from their cages and escaped the crumbling ruins.<ref name="ep102">{{episode|Yu-Gi-Oh! ZEXAL|102|ref}}</ref> The group then headed to [[Spartan City]], where Shark and friends went to see the [[Pro Duelist Spartancity Tournament]] and reunited with [[Nistro]] and [[Dextra]]. They learned the tale of a gladiator warrior from the duo and deduced that "Number" was in the colosseumcoliseum, which was under a lake. At night, Shark and the others were awoken by explosion coming from the ruins and rushed over there. When Yuma and Dextra began a [[Tag Duel]] against [[Alito]], who brainwashed Nistro, Shark watched the Duel alongside Kite and Rio.<ref name="ep103">{{episode|Yu-Gi-Oh! ZEXAL|103|ref}}</ref> After the Duel ended, Shark and the others returned to the airship the next day and listened to Tori and [[Orbital 7]] complaining to Rio about being left behind.<ref name="ep104">{{episode|Yu-Gi-Oh! ZEXAL|104|ref}}</ref>

On the way to the next location, Shark spoke with Yuma about his daze and knew he was thinking about Alito. Shark told him that Alito's change in personality exposed his "true colors" as a [[Barian]] and was annoyed by how Yuma still seemed so concerned about him. Upon arriving in an mountain range, Shark went with Yuma and Kite to climb a mountain to reach the ruins. As he was struggling to climb, Shark snapped at Yuma, who was giving them pointers to mountain-climbing, and told to shut his mouth. When they came to the [[Number ruins]], they met [[JinlongJinlon]], a [[Number Guardian]]. Shark listened to Jinlong Jinlon and [[Astral]]'s conversation about the person similar to Kite, which the former confirmed the person was named "[[Mizar]]". Astral revealed to Shark and the others that the Barians were humans once, but Shark found his statement ridiculous. Shark then watched Kite Duel against Jinlong Jinlon along with Yuma and Astral.<ref name="ep105">{{episode|Yu-Gi-Oh! ZEXAL|105|ref}}</ref> After Kite won the Duel, Shark and the others listened to JinlongJinlon's tale about Mizar and how he died. When Mizar arrived at the ruins and clashed with Kite's dragon aura, the group ended up on a mountain peak after the [[Number ruins]] vanished. They listened to Jinlong Jinlon explaining that when people searching for "Numbers" come to the ruins, huge changes will occur in the world and about the "two lights" battling in the sky long ago.<ref name="ep106">{{episode|Yu-Gi-Oh! ZEXAL|106|ref}}</ref>

As the [[Different Dimension Airship]] headed to the final two Number ruins in the oceanFile:SharkMirrorSmash.png|left|200px|thumb|Shark, Shark overheard Yuma angry and Astral speaking confused about the Barians about being humansrevelations of his past incarnation. He warned the duo that over thinking the situation was a bad idea and they should not get emotions involved. Yuma asked ]]As he continued to see visions of his past, Sharkdefeated "Gorgonic Guardian" by turning its own effect against it with Rio's reason for fighting against the Barians"Freezing Point" card, he replied that what reflecting how it was defeated in the Barians done to him and Rio was enough for him to seek revenge. When Yuma mentioned Shark forgave [[Vetrix]] and past with [[Dr. Fakermirror shield]] for their transgressions, Shark clarified he never did forgave them and that he only stopped fighting them because they lost the will to fight. Astral inquired not involving emotions in a Duel was Shark's philosophy, but he stated that he was fighting for his own sake and proclaimed himself a "lone wolfAbyss brought forth the ". In the midst of a storm, [[Number 73: Abyss Splash (characteranime)|Number 73: AbyssSplash]] possessed . After Shark saw how Rio and Shark witnessed had died in her plunging into the water below and quickly followedpast life, with Yuma Abyss insisted that Shark would lose his sister and Astral close behind. Following Rio's footprintseverything important to him in this life just as in the past, they entered saying it was because of the labyrinth-like ruin and weakness in Shark noticed Rio's "[[Freezing Point]]" card lying on the ground and went to examine it, but the labyrinth suddenly generated new walls to separate them. Shark eventually reached the heart of the temple and found still Rio possessed by Abyss. When Abyss claimed he and released his control over Rio, Shark were destined to fight and urged him was able to contact the other "awakenNumber", as he is in the one who will inherit Abyss' powers. Shark began a Duel to get Rio backruin, but Abyss gained a significant advantage over him with "[[Gorgonic GuardianNumber 94: Crystalzero (anime)|Number 94: Crystalzero]]". Using the "Number", he defeated Abyss used his powers to allow and entrusted both "Numbers". Afterwards, Shark access to his past life's memories and he recalled Vector's attack on [[United Lands of the Poseidon Ocean|his kingdom]] and expressed confusion over others was transported back to the whole situationairship, but Rio remained unconscious.<ref name="ep108ep109" />

[[File:SharkMirrorSmashShark With Rio.jpg|thumb|200px|right|Shark visiting Rio.]]Returning to [[Heartland]], Shark visited his comatose sister at the hospital when she had another premonition, saying a great darkness was surrounding Yuma and that a great tragedy would soon happen. Worried, Shark rode off to find Yuma with Tori and asked if Yuma was alright.pngAs ashes began to fall from the sky, the group was transported by [[Number 96 (character)|Number 96]] to another location, alongside Kite and Orbital 7. Shark and group listened to Number 96's goal of destroying all three worlds and observed Yuma Dueling against Number 96.<ref name="ep110">{{episode|Yu-Gi-Oh! ZEXAL|110|ref}}</ref> As events came to a climax, they witnessed Astral destroying Number 96 and forced to parted ways with a tearful Yuma. Shark and the others were transported back to Heartland and stood silently as a heartbroken Yuma cried for his lost friend.<ref name="ep111">{{episode|Yu-Gi-Oh! ZEXAL|111|ref}}</ref> Sometime later, an anguished Shark visited Rio again when Tori also came by with flowers. She tried to talk to Shark about Yuma's current painful state, but he told her that things are already bad and that he does not want to talk to Yuma now because he doesn't know what to say to him and doesn't know how to. After Tori left, Shark reflected how the "current [him]" had done and said everything he could say and do, but wished that there was a chance to fix everything.<ref name="ep112">{{episode|200pxYu-Gi-Oh! ZEXAL|thumb112|ref}}</ref> As he continued to visit Rio, Sharkstruggled to accept what he had learned in the temple, angry causing him to think of his own past and the death of his parents. When Shark returned to his old house and reflected on the memories of his childhood, he determined he couldn't be a Barian. Suddenly, he was ambushed by [[Chironex]], who attempted to sting Shark with jellyfish poison, chasing Shark out of the house. Eventually, Shark was infected by the poison and Chironex wagered the poison's antidote on a Duel, pointing out they had already infected Rio as well. When [[Quattro]] intervened, calling himself Shark's "biggest fan", Shark was shocked to see his old rival and stubbornly rejected his help. However, with poison quickly taken affect on his body, Shark grudgingly teamed up with Quattro to Duel Chironex.<ref name="ep114" /> After the Duel, Shark learned that Chironex was responsible for the car crash and stated that even Shark died, which confused him. Shark then noticed that a fountain in the backyard of the [[Kastle's mansion]] had the same crest that his past life did, making him realize that his entire family are descendants from his past life. With his previous resolve shaken, Shark started to wonder if he really was a Barian.<ref name="ep115">{{episode|Yu-Gi-Oh! ZEXAL|115|ref}}</ref> At the hospital, Shark reflected on what he had learned after his duel with Chironex, especially about how he and Rio were supposedly killed in the revelations car crash. When he turned around he was shocked to see [[Dumon]], who called him "Nash" and told him it was time to realize his identity.<ref name="ep118">{{episode|Yu-Gi-Oh! ZEXAL|118|ref}}</ref> Shark and his comatose sister were transported back the [[Number ruins]] by Dumon and he experienced more memories of his past incarnationlife.<ref name="ep119" /> As Shark experienced his past life's events, Shark met Rio's spirit, who told him that she was also watching those memories. They spoke about the war and how Shark will choose a kind decision to minimize the causalities, even if he will suffer from it. Shark told Rio that he remembered that someone taught him how hatred would spread if he didn't, and smiled once Rio correctly guessed that "someone" was Yuma. After Shark saw how tragic the war between Nash and Vector ended, Shark accepted that he was indeed a Barian and he was Nash.Dumon stated that the Barian World originally did not have many residents in it due to the actions of Astral World, but Shark's legendary battle with Vector caused all the perished souls to enter the Barian World; that connection alone was why Shark was the leader of the [[Seven Barian Emperors]]. With bitter tearful eyes and his sister trying to comfort him, Shark lamented on how destiny can be so cruel and ironic, realizing that the enemy Yuma, Astral and Kite should be fighting is him.<ref name="ep120" />

As he continued to see visions of [[File:Barians2.png|left|200px|thumb|Shark accepting his pastidentity as Nash, alongside Marin.]]Shark defeated "Gorgonic Guardian" by turning its own effect against it with and Riowere then transported to the [[Barian World]] and found Nash's "army and [[Freezing PointIris]]" card, reflecting how it who warmly greeted him. Shark listened to Dumon telling him that he was defeated in the past only one who could end the war with [[mirror shieldAstral World]]s, but Abyss brought forth even if it meant breaking his bond with Yuma and his friends. As Shark remembered his times with Yuma, his friends and rivals, Shark ruefully chose to follow his destiny and settle the war his way, accepting his identity as the Barian, Nash.<ref name="ep121">{{episode|Yu-Gi-Oh! ZEXAL|121|ref}}</ref> Later, he told Rio to stop calling him "Reginald"[[Number 73: Abyss Splash]]. After Shark saw how Rio called the entire situation her fault, as none of it would have happened had died she not sacrificed herself in her past previous life. Shark responded that it was he that was to blame, Abyss insisted that Shark would lose as his sister and everything important to him hatred of Vector in his own past life was what started this life just as in . She asked if he could really fight Yuma and his friends and Shark responded that he would, "for the sake the pastBarian World", saying it was because while throwing away the pendant that contained the picture of the weakness in Shark's hearthis family. When Abyss released his <ref name="ep125">{{episode|Yu-Gi-Oh! ZEXAL|125|ref}}</ref> They regained their original Barian forms and assumed control over Rioas leaders of the Seven Barian Emperors once more, Shark calling for an emergency meeting. Vector was able shocked to contact the other see that Nash and Marin had returned and were still alive.<ref name="Numberep122" >{{episode|Yu-Gi-Oh! ZEXAL|122|ref}}</ref> Dumon revealed that they ended up on Earth as humans. Nash confirmed that though they were enemies in the ruinHuman World, "[[Number 94: Crystal Zero]]"he was on their side now. Using the "Number"To prove this, he defeated Abyss and entrusted both "Numbers"told Vector to kill him should Vector sense any hint of betrayal. AfterwardsVector suggested they attempt to take Earth immediately, Shark as Yuma and the others was transported Astral weren't around. Nash told Vector not to underestimate Yuma - there is no way he won't be back . He bestowed new power to each of the airshipBarian Emperors, but Rio remained unconsciousthen agreed to Vector's plan.<ref name="ep109ep123" >{{episode|Yu-Gi-Oh! ZEXAL|123|ref}}</ref>

==== Barian Emperor Onslaught ====[[File:Shark With RioSeven Barian Emperor's arrival.jpgpng|thumb|right|200px|rightNash along with other [[Seven Barian Emperors|Barian Emperors]] arriving on Earth.]]After [[Mr. Heartland]] was defeated, the Seven Barian Emperors arrived together on Earth in front of [[Yuma Tsukumo|Yuma]], who was pleased to see Shark. Shark responded that he was no longer Shark visiting Rioor Reginald, but Nash of the Barians. The seven proceeded to [[Barian Battlemorph]] and revealed that he was the leader of the Barians. When Yuma asked why that had to battle, Nash responded that this is what fate had decided, which Yuma found to be ridiculous and promised to revive their bond through Dueling. Suddenly, his [[Barian Emblem]] reacted with the [[Emperor's Key]], letting Yuma see Nash's past life and Nash see the events that Yuma had been involved with in the [[Astral World]], making him comment that they both carried the responsibility of a world on their shoulders. After Yuma fainted, they were about to attack when [[Roku]] and [[Kaze]] arrived and pelted the Emperors with smoke bombs, allowing Yuma's entire group to escape. Nash ordered a chase, but each of the other Emperors except [[Vector]] were blocked by Yuma's companions and forced to Duel. Nash caught up with the car they had used to flee and found himself confronted by [[Quattro]] as the car sped away again. Quattro vowed to do what Yuma would do - reforge the bonds of friendships with a Duel, but Nash proclaimed they can never understand each other no matter how many times they Duel. Although, Quattro gained the advantage, Nash revealed his "[[Number 10X|Over-Hundred Number]]" card, "[[Number 101: Silent Honor ARK (anime)|Number 101: Silent Honor ARK]]".In response, Quattro used what he called the "trump card of humanity" - "[[Rank-Up-Magic Argent Chaos Force (anime)|Rank-Up-Magic Argent Chaos Force]]" - to create "[[Number C15: Gimmick Puppet Giant Hunter (anime)|Number C15: Gimmick Puppet Giant Hunter]]" and destroyed "Silent Honor ARK". Nash then initiated a [[Chaos Draw]] at the same time as the other Emperors.<ref name="ep124"/>

Returning to [[HeartlandFile:NaschandtheBarians.png|200px|thumb|left|Nash recalls the people he must protect.]], Shark visited his comatose sister at the hospital when she had another premonition, saying a great darkness was surrounding Yuma and that a great tragedy would soon happenThis lets each of them create "[[Rank-Up-Magic - The Seventh One (anime)|Rank-Up-Magic - The Seventh One]]". WorriedEach of them Ranked Up their "Over-Hundred Number", Shark rode off to find Yuma with Tori and asked if Yuma was alright. As ashes began to fall from the sky, the group was transported by Nash unveiling "[[Number 96C101: Dark Mist Silent Honor DARK (characteranime)|Number 96C101: Silent Honor DARK]] ". He claimed he was never friends with any of them and urged Quattro to another locationsee him not as a friend, but as an enemy he must defeat, alongside Kite and Orbital 7but Quattro still aimed to reforge their bonds. Shark and group listened Quattro countered "Silent Honor DARK" by using "Argent Chaos Force" to create "[[Number 96's goal C40: Gimmick Puppet of destroying all three worlds and observed Yuma Dueling against Dark Strings (anime)|Number 96C40: Gimmick Puppet of Dark Strings]]".<ref name=Though it destroyed "ep110Silent Honor DARK">{{episode|Yu-Gi-Oh! ZEXAL|110|ref}}</ref> As events came , that card was able to a climaxrevive itself and give Nash more Life Points, they witnessed Astral destroying Number 96 and forced to parted ways boot. All the other Duels ended with a tearful Yumathe defeat of the human participants and Nash allowed Quattro see each of them. Shark Finally, Quattro lost hope that he could save Nash and Nash claimed he could bury the others were transported back last link to Heartland and stood silently "Reginald" by defeating Quattro, but was pleased that Quattro's hatred had been reignited as his voice adopted a heartbroken Yuma cried for his lost friendmore demonic tone.<ref name="ep111ep125"/>{{episode[[File:TheTrueBarianRises.png|Nash buries his humanity.|thumb|right|Yu200px]]Quattro proceeded to Rank-Gi-Oh! ZEXALUp "[[Number 88: Gimmick Puppet of Leo (anime)|111Number 88: Gimmick Puppet of Leo]]" into "[[Number C88: Gimmick Puppet Disaster Leo (anime)|ref}}</ref> Sometime laterNumber C88: Gimmick Puppet Disaster Leo]]", but Nash countered its [[Automatic Win]] condition by [[attach]]ing an anguished Shark visited Rio again when Tori also came by with flowersOverlay Unit from "Silent Honor DARK" to it via "[[Overlay Award]]". She tried Using "[[Cross Draw of Destiny]]", Nash Summoned "[[Silent Wobby (anime)|Silent Wobby]]" to talk to Shark about YumaQuattro's current painful statefield and absorbed it with "Silent Honor DARK", defeating Quattro with a boost from "[[Power Stream]]". After the Duel, Nash returned to his human form while Quattro shared his final words with him, but he told her pointing out that things are already bad and that he does not want Nash was using him to talk to Yuma now because force himself into a destiny he doesncouldn't know what escape from. As Quattro was sent to say the Barian World, he remarked he would be going to him hell before Nash, who responded that he'd be joining Quattro there as soon as the conflict was over. The other Emperors regrouped and doesn't know how Nash ordered them to. After Tori left, Shark reflected how split and find the remaining "current Number" holders - Yuma, Astral, [[himTrey]]" had done and said everything he could say and do, but wished that there was a chance to fix everything[[Quinton]].<ref name="ep112ep126">{{episode|Yu-Gi-Oh! ZEXAL|112126|ref}}</ref>

As he continued to visit Rio, Shark struggled to accept what he had learned in the temple, causing him to think of his own past and the death of his parents[[File:GiragCapturesNash. When Shark returned to his old house and reflected on the memories of his childhood, he determined he couldn't be a Barian. Suddenly, he was ambushed png|thumb|left|Nash getting captured by [[KurageGirag]], who attempted to sting Shark with jellyfish poison, chasing Shark out of the house. Eventually]]Shortly thereafter, Shark Nash was infected alerted to a Duel starting by seeing "[[Number 9: Dyson Sphere (anime)|Number 9: Dyson Sphere]]" in the poison and Kurage wagered the poison's antidote on a Duel, pointing out they had already infected Rio as wellsky. When [[QuattroGirag]] intervened, calling himself Shark's "biggest fan", Shark was shocked to see his old rival approached him and informed him that Yuma and stubbornly rejected his help. However, with poison quickly taken affect allies were on his body, Shark grudgingly teamed up with Quattro their way to Duel Kurage.<ref name="ep114" /> After the Duel, Shark learned that Kurage was responsible for the car crash and stated that even Shark died, which confused him. Shark then noticed that a fountain in the backyard of the [[Kastle's mansionBarian World]] had . He ordered Girag to return there quickly, while doing the same crest that his past life did, making him realize that his entire family are descendants from his past life. With his previous resolve shaken, Shark wondered if he really was a Barianhimself.<ref name="ep115ep127">{{episode|Yu-Gi-Oh! ZEXAL|115127|ref}}</ref> Partway through the trip, Girag pretended to be trapped by dark tentacles, prompting Nash to try to save them. The tentacles snared Nash and Girag told him he couldn't be allowed to Duel Yuma, saying it was in the name of [[Don Thousand]].<ref name="ep128"/>

At the hospital, Shark reflected [[File:Nasch taking great pain.png|thumb|right|200px|Nash screams in pain as "[[Don Thousand's Throne]]" draws on what he had learned after his duel with Kuragepowers.]]Within an inflamed [[Sphere Field]], especially about how he and Rio were supposedly killed Nash was tangled in the car crash. When he turned around he was shocked to see dark tentacles, being confined by [[DumonDon Thousand]]. A screen appeared before him, who called letting him "witnessed his sister and [[NaschDumon]]" being confronted by Vector and told him it was time Don Thousand. They revealed that the Seven Barian Emperors were created by Don Thousand to realize serve as fuel for his identityrevival.<ref name=When the Duel commenced, Vector activated the Spell Card "ep118">{{episode|Yu-Gi-Oh! ZEXAL|118|ref}}</ref> Shark and his comatose sister were transported back the [[NumberDon Thousand's RuinsThrone (anime)|Don Thousand's Throne]] by ", which drew power from Nash, causing him great pain. As the Duel continued, Nash, Marin and Dumon finally learned what happened to the Barian leaders long ago as Vector revealed he killed them and he experienced more that their souls were transferred into new bodies for them to live on by [[Abyss (character)|Abyss]], but without their memories of his past lifeas Barians.<ref name="ep119ep131" /> As Shark experienced his past life's eventsNash continued to watch the Duel, Shark met Riohe watched in horror as Dumon was killed trying to protect Marin from Vector's spirit, who told him that she wrath.<ref name="ep132"/> When Marin was also watching those memories. They spoke about the war and how Shark will choose a kind decision to minimize the causalitiesbe defeated, even if he will suffer from it. Shark told Rio that he remembered that someone taught Nash begged Vector to take him how hatred would spread if instead, but Marin was killed by Vector in the end as he didn'tyelled her name in anguish, and smiled once calling her "Rio correctly guessed that "someone" was Yuma. After Shark saw how tragic the war between Nasch Marin's spirit appeared to him and Vector endedcalled him "Reginald", Shark accepted telling him to live on and that he she was indeed a Barian and he was Nasch. Dumon stated that the Barian World originally did not glad to have many residents in it due to walked the actions of Astral World, but Shark's legendary battle with same path as him. When Vector caused all left to absorb the perished souls to enter the Barian World; that connection alone was why Shark was the leader of the Girag, [[Seven Barian EmperorsAlito]]. With bitter tearful eyes and his sister trying to comforted him[[Ponta]], Shark lamented on how destiny can be so cruel Nash broke out of the Sphere Field in a rage and ironicresumed his Barian form. This alerted Vector, realizing that causing him to leave Yuma<ref name="ep133" /> as Nash immediately began to travel through the enemy Yumadimensions to find Vector, Astral and Kite should be fighting is himwho had returned to the Barian World.<ref name="ep120ep135" >{{episode|Yu-Gi-Oh! ZEXAL|135|ref}}</ref>

[[File:Barians2Vector VS Nasch (136).png|thumb|left|200px220px|Vector vs. Nash]]When Nash arrived, he fired a lightning bolt at Vector in a rage. They began their Duel, with Vector having brought the [[Number ruins|ruins]] from his past life into the Barian World to serve as their arena. Vector used "[[Contract with Don Thousand]]" to give Nash a handicap, with Nash proceeding to fall into his trap and attack with "Silent Honor DARK" after Summoning it with "The Seventh One". Using a combination of "[[Chaos Rising]]" and "[[Chaos Caller]]", Vector brought out "[[Number C65: King Overfiend (anime)|Number C65: King Overfiend]]", "[[Number C104: Umbral Horror Masquerade (anime)|Number C104: Umbral Horror Masquerade]]", "[[Number C102: Archfiend Seraph (anime)|Number C102: Archfiend Seraph]]" and "[[Number C103: Ragnafinity (anime)|Number C103: Ragnafinity]]". Yuma arrived to support Nash at this point, but Nash persisted that they were enemies now. Vector used the power he had gained from the other Emperors to gain a new form. Nash survived Vector's assault with 100 Life Points and launched a counterattack using "[[Split Defender]]" and "[[Xyz Charge Up]]", ultimately resulting in him taking control of "King Overfiend" and using it to destroy "Umbral Horror Masquerade". This triggered Vector's true memories.<ref name="ep136"/> Once he remembered, Vector claimed to have realized the error of his ways, and activated "[[Xyz Discharge]]", allowing Nash to seize control of his comrades' "[[Number C10X|Chaos Over-Hundred Number]]s" at the cost of sending a card in his hand to the Graveyard. Attacking at Vector's wishes, he fell into his trap, "[[Trick Buster (anime)|thumbTrick Buster]]", which destroyed all of Nash's monsters and dealt him 300 damage for each monster destroyed. However, Nash avoided the damage by activating the effect of his "[[Dream Shark (anime)|Dream Shark accepting ]]". Vector, who was surprised to see him survive, accused Nash of not trusting him to start with, with Nash responding that he discarded the ability to trust when he shed his identity humanity. As the battle waged on, Vector performed a direct [[Chaos Xyz Evolution]], Summoning "[[Number C5: Chaos Chimera Dragon (anime)|Number C5: Chaos Chimera Dragon]]" with the effect of "[[Rank-Up-Magic Admiration of the Thousands (anime)|Rank-Up-Magic Admiration of the Thousands]]", using "Chaos Numbers" in the Graveyard as NaschOverlay Units. This card nearly defeated Nash, alongside Meragbut he survived with "[[Depth Gardna]]" and then used "[[Infinity Tooth]]" to counter Vector's manipulation of his draws.He performed a second Chaos Draw and used the resulting "[[Depth Biter]]" to Summon "[[Number 73: Abyss Splash (anime)|Number 73: Abyss Splash]]". Though Vector countered with "[[Overlay Burglary]]", Nash revealed a second "[[Rank-Up-Magic]]" in the form of "[[Rank-Up-Magic Quick Chaos (anime)|Rank-Up-Magic Quick Chaos]]", creating "[[Number C73: Abyss Supra Splash (anime)|Number C73: Abyss Supra Splash]]" and defeating Vector.<ref name="ep137"/>

Shark and Rio were then transported to the As Vector went berserk with his power, Nash was surprised when [[Barian WorldDon Thousand]] appeared before them and found Nasch's army tried to absorb Vector. He showed a little concern when Yuma ran to try and [[Iris]]save Vector, who warmly greeted him. Shark listened urging Yuma to Dumon telling him stop and that he was the only one who could end the war with [[Astral World]], Vector had no soul; even if it meant breaking his bond with Yuma and his friendsdid save Vector, Vector would backstab him again. As Shark remembered his times with After Vector let himself be absorbed to protect Yuma, and Don Thousand assumed his friends and rivalstrue form, Shark ruefully chose to follow his destiny Mizar arrived and settle Nash watched the war Duel between him and Don Thousand. When Mizar lost, Nash mourned his waydeath, accepting his identity which left him as the last of the Seven Barian, NaschEmperors.<ref name="ep121">{{episode|Yu-Gi-Oh! ZEXAL|121|ref}}</ref> LaterWith his new form, Don Thousand stated that he told Rio will absorb Nash as well and challenged him and Yuma to stop calling him "Reginald"a Duel. Rio called the entire situation her faultTo avenge his comrades, as none of it would have happened had she not sacrificed herself in her previous life. Shark responded that it was he that was Nash agreed to blame, as his hatred of Vector in his own past life was what started thisteam up with Yuma against Don Thousand. She asked if he could really fight Thousand quickly negated Yuma and his friends and Shark responded that he would's Summon of "[[Number 39: Utopia (anime)|Utopia]], "for revealing that the sake merging of the Barian World"and human Worlds was to enable him to control the [[Numeron Code]], while throwing away allowing him to attack the pendant that contained the picture of his familyAstral World directly.<ref name="ep125ep138"/>{{episodeUsing his "[[Numeron]]" monsters, Thousand nearly defeated them, with Yuma and Nash surviving with "[[Half Unbreak (anime)|Yu-Gi-Oh! Half Unbreak]]" and "[[Cutter Shark (ZEXALanime)|125|ref}}</ref> They regained their original Barian forms and assumed control as leaders Cutter Shark]]". Astral left to find the location of the Seven Barian Emperors once more, calling for an emergency meeting. Vector was shocked "[[Numeron Network (anime)|Numeron Network]]" card to see that Nasch and Merag had returned and were still alivehelp them.<ref name=Nash baited Thousand into using "Numeron Network"ep122to rewrite his ">{{episode[[Aqua Jet (anime)|YuAqua Jet]]", allowing him to use "Rank-Up-Magic -GiThe Seventh One" to bring out both his "Over-Oh! ZEXALHundred Number" and its "Chaos" form. Thousand survived with "[[Numeron Wall (anime)|122|ref}}</ref> Dumon revealed that they ended up on Earth as humans. Nasch confirmed that though they were enemies in Numeron Wall]]", but by then Astral had found "Numeron Network" and put it onto the Human Worldfield, he resulting in Nash destroying it with "[[Depth Eruption]]". Nash was on their side now. To prove this, he told Vector tearful when it appeared that Astral would sacrifice himself to kill him should Vector sense any hint of betrayal. Vector suggested they attempt to take keep the resulting energy from destroying Earth immediately, as Yuma but [[Eliphas]] appeared and sacrificed himself in Astral aren't around. Nasch told Vector not to underestimate Yuma - there is no way he won't be back. He bestowed new power to each of the Barian Emperors, then agreed to Vector's planplace.<ref name="ep123ep139">{{episode|Yu-Gi-Oh! ZEXAL|123139|ref}}</ref>

==== Barian Emperor Onslaught ====[[File:Seven Barian Emperor's arrivalDoubleDestinyDraw.png|thumb|200px|right|200px|Nasch along with other [[Seven Barian Emperors|Barian EmperorsShining Draw]] arriving on Earth.and [[Chaos Draw]]After [[Mr. Heartland]] was defeated, the Seven Barian Emperors arrived Yuma and Nash worked well together on Earth in front of [[Yuma Tsukumo|Yuma]], who was pleased to see Sharkwith their combinations nearly defeating Thousand several times. Shark responded that he was no longer Shark or ReginaldHowever, but Nasch of the Barians. The seven proceeded to Thousand countered with "[[Barian BattlemorphNumber C1000: Numeronius (anime)|Number C1000: Numeronius]] and revealed that he was ", whose effects controlled nearly the leader of the Bariansentire field. When Yuma asked why that had Nearly defeated, Kite's spirit appeared to battle, Nasch responded that this is what fate had decided, which Yuma found to be ridiculous and promised Yuma was able to revive their bond through Dueling. Suddenly, his [[Barian Emblem]] reacted counter with the "[[Emperor's KeyNumber 100: Numeron Dragon (anime)|Number 100: Numeron Dragon]]". This play forced Thousand into his final trump card, letting Yuma see Nasch's past life and Nasch see the events that Yuma had been involved with in the "[[Astral WorldNumber iC1000: Numeronius Numeronia (anime)|Number iC1000: Numeronius Numeronia]]". The card could not attack, making him comment that they both carried the responsibility of but essentially put a world timer on their shoulders. After Yuma fainted, the Duel - if they were about to did not attack when it next turn, Thousand would [[RokuVictory Condition|win automatically]] and . Yuma activated "[[KazeSession Draw]] arrived and pelted the Emperors with smoke bombs", allowing Yumaletting both of them draw during Nash's entire group to escape. Nasch ordered a chase, but each of the other Emperors except next [[VectorDraw Phase]] . If the monsters drawn were blocked by Yuma's companions and forced to Duel. Nasch caught up with of the car same Level, they had could Xyz Summon using them. Yuma used to flee and found himself confronted by [[QuattroShining Draw]] as the car sped away again. Quattro vowed to do what Yuma would do - reforge the bonds of friendships with a Duel, but Nasch proclaimed they can never understand each other no matter how many times they Duel. Althoughwhile Nash used Chaos Draw, Quattro gained the advantage, Nasch revealed his allowing them to use "[[Number 10XZW - Tornado Bringer (anime)|ZW - Tornado Bringer]]" card, and "[[Number 101: Silent Honors Ark KnightPanther Shark (anime)|Panther Shark]]". In response, Quattro used what he called the to bring out "trump card of humanityAbyss Splash" - . Yuma's "[[Rank-Up-Magic Argent Chaos ForceUtopia Rising]]" - to create and "[[Number C15: Gimmick Puppet Serial KillerBonds of Hope]]" Trap Cards further augmented "Utopia" with the effects of "Abyss Splash" and destroyed "Ark KnightNumeron Dragon". Nasch then initiated a [[Barian's Chaos Draw]] at the same time as the other Emperors.<ref name="ep124ep140">{{episode|Yu-Gi-Oh! ZEXAL|124140|ref}}</ref>

[[File:NaschandtheBariansNaschAbsorbsThousand'sNumbers.png|left|200px|thumb|left|Nasch recalls the people he must protectNash absorbs Thousand's "Numbers" and remaining power.]]This lets each of them create "[[Rank-Up-Magic The Seventh One]]". Each of them Ranked Up their "Number 10X", with Nasch unveiling "[[Number C101: Silent Honors Dark Knight]]". He claimed he was never friends with any combination of them and urged Quattro effects seemed to see him not as a frienddefeat Thousand, but as an enemy he must defeat, but Quattro still aimed to reforge their bonds. Quattro countered had one last counter in the form of "Dark Knight" by using "Argent Chaos ForceNumeronius Numeronia" being able to create "[[Number C40: Gimmick Puppet Devil's Stringsnegate]]". Though it destroyed "Dark Knight", that card was able to revive itself an attack and give Nasch more Life Points, to bootgain ATK by detaching an Overlay Unit. All the other Duels ended with the defeat of the human participants and Nasch allowed Quattro see each of them. Finally, Quattro lost hope that he could save Nasch and Nasch claimed he could bury the last link to "Reginald" by defeating Quattro, but was pleased that QuattroYuma's hatred had been reignited as he voice adopted a more demonic tone.<ref name=final counter was "ep125" /> [[File:TheTrueBarianRises.pngDouble or Nothing! (anime)|Nasch buries his humanity|thumb|right|200px]]Quattro proceeded to Rank-Up "[[Number 88: Gimmick Puppet of Leo]]" into "[[Number C88: Gimmick Puppet Disaster LeoDouble or Nothing!]]", but Nasch countered its [[Automatic Win]] condition by [[attach]]ing an Overlay Unit from enabling "Dark KnightUtopia" to it via destroy "[[Overlay Award]]Numeronius Numeronia". Using "[[Cross Draw of Destiny]]"Thousand laughed upon his defeat, Nasch Summoned "[[Silent Wobbe]]" to Quattro's field and absorbed it what remained of his power along with his "Dark Knight", defeating Quattro with a boost from "[[Power Stream]]Numbers"were absorbed by Nash. After Still wishing to save the DuelBarian World, Nasch returned Nash transported Yuma and Astral to his human form while Quattro shared his final words with himan arena between the worlds, pointing out revealing that Nasch was using the worlds would collide soon, resulting in the Astral World's destruction. Yuma insisted the worlds could coexist, but even Astral told him this could not be, as a merging of all the worlds would simply cause the weakened Astral World to force himself into a destiny fade away. Nash declared that though he still considered Yuma and Astral his friends, it did not matter - he couldn't escape from. As Quattro was sent to would fight for the sake of the Barian World, to protect his other friends. He also revealed that Thousand has never cursed Nash as he remarked did the other Emperors - he would be going to hell before Naschbecame a Barian of his own free will, who responded that he'd be joining Quattro there as soon as his comrades had already been sent to the Barian World. He claimed the conflict true curse was overhis very existence. The other Emperors regrouped and Nasch ordered them Nash challenged Yuma to split one last Duel with all the "Numbers" - and find by extension the power of the Numeron Code - on the line. Honoring his fallen comrades, Nash utilized the remaining "Chaos Over-Hundred Number" holders - monsters of the other six Emperors, even Summoning some of them to Yuma, Astral, [[Trey]] and [[Quinton]]'s field.<ref name="ep126ep141">{{episode|Yu-Gi-Oh! ZEXAL|126|ref}}</ref>

[[File:Girag captures NaschBarianEmperorSpirits.jpgpng|right|200px|thumb|left|Nasch getting captured by "[[GiragCXyz Barian Hope (anime)|CXyz Barian Hope]]" unites Nash with the other Emperors.]]Shortly thereafterNash used the seven "Chaos Over-Hundred Numbers" to Summon his ultimate ace card, Nasch was alerted to a Duel starting by seeing "[[Number 9: Dyson SphereCXyz Barian Hope (anime)|CXyz Barian Hope]]" in . This monster wielded the power of all seven of the "Chaos Over-Hundred Numbers" and allowed Nash to use each of their effects once per turn by either detaching an Overlay Unit or paying 400 Life Points. Nash continually paid his Life Points, as he did not wish to sacrifice his comrades again, as their souls were bound to the Overlay Units. Though Nash used the effect of every "Chaos Over-Hundred Number", Yuma and Astral narrowly avoided defeat. Yuma and Astral performed ZEXAL Morph, but at that point, the skyworlds began to drift closer to one another. They were saved by [[GiragKazuma Tsukumo]] approached him and informed him that Yuma and his allies were on their way to the [[Barian WorldVetrix]], who used the last of their power to erect barriers between the arena and the colliding worlds. He ordered Girag They both urged the Duelists to return there quickly, while doing continue the same himselfDuel.<ref name=Yuma used "ep127">{{episode[[Rank-Up-Magic Astral Force (anime)|YuRank-GiUp-Oh! ZEXALMagic Astral Force]]" to create "[[Number 39: Utopia Beyond (anime)|127|ref}}</ref> Partway through the tripNumber 39: Utopia Beyond]]". "Barian Hope" would have been destroyed, Girag pretended but Nash countered with "[[Overlay Menace]]" to be trapped by dark tentacles, prompting Nasch protect the other Emperors and "[[Xyz Trip]]" to try negate the attack. [[File:NaschCracks.png|left|200px|thumb|Nash tells Yuma and Astral to save themdie. The tentacles snared Nasch ]] Nash attempted a counterattack, but Yuma's "[[Weaker Overlay]]" and Girag told him he couldn't be "[[Damage Reactor]]" allowed "Utopia Beyond" to Duel destroy "Barian Hope". Nash screamed in anguish, asking why Yuma, saying it was in and Astral must keep crushing the name dreams of [[Don Thousand]]the Barians.<ref name="ep128ep142">{{episode|Yu-Gi-Oh! ZEXAL|128142|ref}}</ref>

[[File:Nasch taking great painNashLosestheNumbers.png|right|200px|thumb|rightNash loses the "Numbers" to Astral.]]Nash set up the return of "Barian Hope" with "[[Reincarnation of the Seven Emperors (anime)|Reincarnation of the Seven Emperors]]" before Summoning "[[Black Ray Lancer (anime)|Black Ray Lancer]]" in an attempt to defeat Yuma. Yuma countered with the effect of "Utopia Beyond", Summoning "Utopia" again. Nash weakened "Utopia" with "[[Friller Rabca (anime)|200pxFriller Rabca]]" and brought out "[[Submersible Carrier Aero Shark (anime)|Nasch takes great pain Submersible Carrier Aero Shark]]" as well, but Yuma survived with "[[Damage Take-Over]]". Using ZEXAL, Yuma and Astral created "[[ZW - Sylphid Wing (anime)|ZW - Sylphid Wing]]", but Nash revived "Barian Hope" using "[[Rebirth of the Seven Emperors (anime)|Rebirth of the Seven Emperors]]" at the expense of his Rank 3 monsters. Yuma pushed the attack, but Nash used "[[Draw of Fate (anime)|Draw of Fate]]" to negate the attack and force both players to draw a card. If the player did not use the drawn card by the end of this turn, they would [[Victory Condition|automatically lose]]. Nash used Chaos Draw to draw "[[Don Thousand's ThroneGlory of the Seven Emperors]]" , while Yuma used Shining Draw to draw "Double or Nothing!" Yuma canceled his powers.attack after activating "Double or Nothing!", knowing that defeating Nash would be to sacrifice who Yuma had been, just as [[the Door]]had predicted. Nash had known he would "Double or Nothing!", but this action was not predicted. "Glory of the Seven Emperors" would have allowed him defeat Yuma had Yuma done anything else, but canceling his attack resulted in Nash's Life Points becoming 0. Nash told Yuma never to lose what was most important to him - his ability to believe in others and his pure heart. He mused that he'd not see the future they would create though. The "Numbers" flooded from Nash's body and were absorbed by Astral. Nash told Tori to never let Yuma out of her sight and called Yuma and Astral the best friends he'd ever had. He informed them that he considered this final Duel to be his greatest - and also the most enjoyable. Nash succumbed to his wounds after this, fading away.<ref name="ep143" />

Within an inflamed [[Sphere Field]]After Yuma's and Astral's Duel, Nasch was tangled in dark tentaclesShark, being confined by [[Don Thousand]]. A screen appeared before him, letting him witnessed his sister and [[Dumon]] being confronted by Vector and Don Thousand. They revealed that the Seven Barian other Emperors were created revived by Don Thousand to serve as fuel for his revival. When the Duel commenced, Vector activated the Spell Card "[[Don Thousand's Throne]]", which drew power from Nasch, causing him great pain. As the Duel continued, Nasch, Merag and Dumon finally learned what happened to of the Barian leaders long ago as Vector revealed he killed them and that their souls were transferred into new bodies for them to live on by [[Abyss (character)|Abyss]], but without their memories as BariansNumeron Code.<ref name="ep131" /> As Nasch He continued to watch the Duel, he watched in horror as Dumon was killed trying to protect Merag from Vector's wrathattend Heartland Academy with Rio.<ref name="ep132">{{episode|Yu-Gi-Oh! ZEXAL|132|ref}}</ref> When Merag was about to be defeated, Nasch begged Vector to take him instead, but Merag was killed by Vector Upon knowing of a new crisis in the end as he yelled her name in anguishAstral World, calling her "Rio". Merag's spirit appeared to him and called him "Reginald", telling him to live on they all joined Yuma and that she was glad to have walked the same path as him. When Vector left to absorb the souls of Girag, [[Alito]] and [[Ponta]], Nasch broke out of the Sphere Field headed there in a rage and resumed his Barian form. This alerted Vector, causing him order to leave Yuma<ref name="ep133" /> as Nasch immediately began to travel through the dimensions to find Vector, who had returned to the Barian Worldhelp Astral.<ref name="ep135ep146">{{episode|Yu-Gi-Oh! ZEXAL|135146|ref}}</ref>

== Other appearances =={{Character other appearances}}

<gallery>==Number Hunting==Manga Ryoga[[File:Number17LeviathanDragon-JP-Anime-ZX-NC.jpg png|left| 200px|thumb|"[[Ryoga Kamishiro Number 17: Leviathan Dragon (mangaanime)|Number 17: Leviathan Dragon]]", the first "[[Number]]".]]DTeam Reginald.jpg | was the original owner of the very first "Number" to imprint itself on an owner, "[[Ryoga Kamishiro Number 17: Leviathan Dragon (D Teamanime)|Ryoga Kamishiro (''D Team'')Number 17: Leviathan Dragon]]ReginaldKastle-Clash.png | ",<ref name="ep1" /> which he lost to [[Reginald Kastle (Clash! Duel Carnival!)Yuma Tsukumo|Reginald Kastle (''Clash! Duel Carnival!'')Yuma]]ReginaldKastleDT.jpg | and [[Shark (Duel Terminal)Astral]].<ref name="ep2" /gallery>

[[File:Number32SharkDrake-JP-Anime-ZX-NC.jpg|right|200px|thumb|Shark faces [[Trey]] and "[[Number 32: Shark Drake (anime)|Number 32: Shark Drake]]".]]Sometime later, [[Trey]] gave him "[[Number 32: Shark Drake (anime)|Number 32: Shark Drake]]" after their Duel during the [[World Duel Carnival]].<ref name="ep34" /> He would eventually lose this card to Yuma as well, but later regain it after Yuma recovered it from the [[Sphere Field]] and allowed him to keep it.<ref name= Relationships ="ep68" /> He also learned to evolve it into "[[Number C32: Shark Drake Veiss (anime)|Number C32: Shark Drake Veiss]]" just as Yuma had done with his own ace card.<ref name="ep58" />

[[File:Number73AbyssSplash-JP-Anime-ZX-NC.png|left|200px|thumb|"[[Number 73: Abyss Splash (anime)|Number 73: Abyss Splash]]", the [[Mythyrian Number|Mythyrian "Number"]] that connects Shark to his past lives as Nash.]]Reginald acquired two of the [[Mythyrian Number|Mythyrian "Numbers"]] from [[Abyss (character)|Abyss]] - "[[Number 73: Abyss Splash (anime)|Number 73: Abyss Splash]]" and "[[Number 94: Crystalzero (anime)|Number 94: Crystalzero]]".<ref name="ep109" /> He would eventually obtain an upgrade for "Abyss Splash" in the form of "[[Number C73: Abyss Supra Splash (anime)|Number C73: Abyss Splash]]"<ref name== Rio Kastle ==="ep137" />

Shark [[File:Number101andNumberC101.png|right|200px|thumb|Nash's "[[Number 10X|Over-Hundred Number]]" and its [[Rio KastleNumber C10X|Rio"Chaos" form]].]] are twins and share a strong bond ever since they were childrenAfter learning of his true origins as Nash, symbolized by he was able to wield his "[[Number 10X|Over-Hundred Number]]" - "[[Kastle twins' ringsNumber 101: Silent Honor ARK (anime)|matching ringsNumber 101: Silent Honor ARK]] that Rio obtained."<ref name="ep78ep123" /> Following Rio's Duel with and its upgraded "[[QuattroC (archetype)|C]]" form, in which she was critically injured and wound up in a hospital bed wrapped in bandages, Shark Dueled in the "[[National Duel CircuitNumber C10X|Chaos Over-Hundred Number]] for her sake, but pressure was escalated to such an extent that he peeped at his opponent's Deck before the final match, an action that caused him to be disqualified and banned" "[[Number C101: Silent Honor DARK (anime)|Number C101: Silent Honor DARK]]".<ref name="ep26ep125" /> During the time Rio was in the hospital to recover from her injuriesUpon defeating Quattro, he acquired "[[Number 15: Gimmick Puppet Giant Grinder (anime)|Number 15: Gimmick Puppet Giant Grinder]]", "[[Number 40: Gimmick Puppet of Strings (anime)|Number 40: Gimmick Puppet of Strings]]" and "[[Number 88: Gimmick Puppet of Leo (anime)|Number 88: Gimmick Puppet of Leo]]" and possibly their upgraded forms - "[[Number C15: Gimmick Puppet Giant Hunter (anime)|Number C15: Gimmick Puppet Giant Hunter]]", "[[Number C40: Gimmick Puppet of Dark Strings (anime)|Number C40: Gimmick Puppet of Dark Strings]]" and "[[Number C88: Gimmick Puppet Disaster Leo (anime)|Number C88: Gimmick Puppet Disaster Leo]]", Shark often visited herrespectively.<ref name="ep75ep126" />

Despite their bondAfter defeating [[Don Thousand]] alongside Yuma, Nash absorbed all of Thousand's "Numbers". Among them were "[[Number 1: Numeron Gate Ekam (anime)|Number 1: Numeron Gate Ekam]]", "[[Number 2: Numeron Gate Dve (anime)|Number 2: Numeron Gate Dve]]", "[[Number 3: Numeron Gate Trini (anime)|Number 3: Numeron Gate Trini]]", "[[Number 4: Numeron Gate Catvari (anime)|Number 4: Numeron Gate Catvari]]", "[[Number 5: Doom Chimera Dragon (anime)|Number 5: Doom Chimera Dragon]]", "[[Number 6: Chronomaly Atlandis (anime)|Number 6: Chronomaly Atlandis]]", "[[Number 9: Dyson Sphere (anime)|Number 9: Dyson Sphere]]", "[[Number 33: Chronomaly Machu Mech (anime)|Number 33: Chronomaly Machu Mech]]", "[[Number 43: Manipulator of Souls (anime)|Number 43: Manipulator of Souls]]", "[[Number 46: Dragluon (anime)|Number 46: Dragluon]]", "[[Number 58: Burner Visor (anime)|Number 58: Burner Visor]]", Shark has a typical tenuous "brother[[Number 62: Galaxy-Eyes Prime Photon Dragon (anime)|Number 62: Galaxy-sisterEyes Prime Photon Dragon]]" relationship with Rio, irritating one another "[[Number 64: Ronin Raccoon Sandayu (anime)|Number 64: Ronin Raccoon Sandayu]]", "[[Number 65: Djinn Buster (anime)|Number 65: Djinn Buster]]", "[[Number 80: Rhapsody in Berserk (anime)|Number 80: Rhapsody in Berserk]]", "[[Number 96: Dark Mist (anime)|Number 96: Dark Mist]]", "[[Number 102: Star Seraph Sentry (anime)|Number 102: Star Seraph Sentry]]", "[[Number 103: Ragnazero (anime)|Number 103: Ragnazero]]", "[[Number 104: Masquerade (anime)|Number 104: Masquerade]]", "[[Number 105: Battlin' Boxer Star Cestus (anime)|Number 105: Battlin' Boxer Star Cestus]]", "[[Number 106: Giant Hand (anime)|Number 106: Giant Hand]]" and having normal siblings squabbles"[[Number 107: Galaxy-Eyes Tachyon Dragon (anime)|Number 107: Galaxy-Eyes Tachyon Dragon]]".<ref name=Many of these also had "[[Number C]]" forms, including the "[[Number 10X|Over-Hundred Numbers]]". In addition, there was "ep78[[Number C1000: Numeronius (anime)|Number C1000: Numeronius]]" /><ref name=and "ep79[[Number iC1000: Numeronius Numeronia (anime)|Number iC1000: Numeronius Numeronia]]" /> They seem to settle any fighting by Dueling each other, having which lacked a total of one-hundred Duelsbase "Number" form.<ref name="ep91ep141" >{{episode|Yu-Gi-Oh! ZEXAL|141|ref}}</ref>

Their bond is incredibly strongAfter losing to Yuma, with brother and sister Nash gave [[Astral]] all the remaining close over many of their lives with Rio supporting and standing by her brother's side ruling together with him as Merag "Number" cards before dying, resulting in their original human lives, as well as again after returning to being Barians.<ref name=Astral obtaining all 100 base "ep109Numbers">{{episode|Yu-Gi-Oh! ZEXAL|109|ref}}</ref>.<ref name="ep123ep143">{{episode|Yu-Gi-Oh! ZEXAL|123143|ref}}</ref>

==Relationships= Yuma Tsukumo ====Rio Kastle===Shark and [[Rio Kastle|Rio]] are twins and share a strong bond ever since they were children, symbolized by [[Kastle twins' rings|matching rings]] that Rio obtained.<ref name="ep78" /> Following Rio's Duel with [[Quattro]], in which she was critically injured and wound up in a hospital bed wrapped in bandages, Shark Dueled in the [[National Duel Circuit]] for her sake, but pressure was escalated to such an extent that he peeped at his opponent's Deck before the final match, an action that caused him to be disqualified and banned.<ref name="ep26" /> During the time Rio was in the hospital to recover from her injuries, Shark often visited her.<ref name="ep75" /> [[File:Rio and Shark.jpg|thumb|Rio and Shark]]

[[File:ZLx001 Shark and Yuma.jpg|200px|thumb|left|Shark and Yuma's first encounter.]]Shark first met [[Yuma Tsukumo]] when he came to defend [[Bronk Stone]] after he beat him in a Duel and took his Deck. In a twist of events, Shark crushed the [[Emperor's Key]] and accepted Yuma's challenge, becoming rivals with the young boy. With Despite their Duel underwaybond, Shark was overtaken by has a typical tenuous "[[Number 17: Leviathan Dragon]]brother-sister" and quickly Summons it to put Yuma in his place. However, relationship with the appearance of [[Astral]] and Yuma's new Xyz MonsterRio, "[[Number 39: Utopia]]", Shark loses the Duel irritating one another and his "[[Number]]"having normal sibling squabbles.<ref name="ep1ep78">{{episode|Yu-Gi-Oh! ZEXAL|1|ref}}</ref><ref name="ep2ep79"/>{{episode|YuThey seem to settle any fighting by Dueling each other, having a total of one-Gi-Oh! ZEXAL|2|hundred Duels.<ref}}<name="ep91" /ref>

Soon afterTheir bond is incredibly strong, Shark falls into the "wrong crowd" with brother and sister remaining close over many of their lives with Rio supporting and stops Dueling all standing by her brother's side ruling together, but with persistence from Yumahim as Marin in their original human lives, Shark agrees to Duel him as well as again. Despite his "Numbers", Yuma loses to Shark, who then tells him to never interfere with his life.<ref name="ep10">{{episode|Yu-Gi-Oh! ZEXAL|10|ref}}</ref> However, Yuma disobeys this after learning of why Shark was the way he was. The two then have a [[Tag Duel]] against [[Scorch]] and [[Chills]], also carried "Numbers" that supported each other. Despite that, Shark was able to aid Yuma, who protected him from any damage, and give him the final trump card that would defeat the two brothers. As a sign of respect for Yuma, he allowed him returning to keep the card he won withbeing Barians.<ref name="ep11ep109">{{episode|Yu-Gi-Oh! ZEXAL|11|ref}}</ref><ref name="ep12ep123">{{episode|Yu-Gi-Oh! ZEXAL|12|ref}}</ref>

===Yuma Tsukumo===[[Mr. Kay]] made a remark that File:ZLx001 Shark had changed due to Yuma's influence and now he sees Yuma as a friend and ally.<ref name="ep22">{{episodejpg|200px|Yu-Gi-Oh! ZEXALthumb|22left|ref}}</ref> Although friends, Shark doesnand Yuma't hang around s first encounter.]]Shark first met [[Yuma as much as his other friends, due Tsukumo]] when he came to defend [[Bronk Stone]] after he beat him in a Duel and took his aloof nature, but is shown to have a soft spot for himDeck. In additiona twist of events, Shark often reflects on his time with crushed the [[Emperor's Key]] and accepted Yuma's challenge, even watches Yuma from afar when he sees himbecoming rivals with the young boy.<ref name=With their Duel underway, Shark was overtaken by "ep22">{{episode[[Number 17: Leviathan Dragon (anime)|Yu-Gi-Oh! ZEXAL|22|ref}}</ref><ref name=Number 17: Leviathan Dragon]]"ep41">{{episode|Yu-Gi-Oh! ZEXAL|41|ref}}</ref> Despite and quickly Summons it to put Yuma in his distant natureplace. However, Shark is willing to open up to him with the appearance of [[Astral]] and Yuma's new Xyz Monster, "[[Number 39: Utopia (to an extentanime)|Number 39: Utopia]]", but tends to push him away sometimesShark loses the Duel and his "[[Number]]".<ref name="ep31ep1">{{episode|Yu-Gi-Oh! ZEXAL|311|ref}}</ref> In turn, Yuma admires Shark and worries about him if he does anything he thinks is wrong or dangerous. When knowing things concerning Shark, Yuma would focus his attention on helping him and putting himself in harm's way, even sometimes ignoring or lashing out on his friends or Astral if they tried to stop him.<ref name="ep35ep2">{{episode|Yu-Gi-Oh! ZEXAL|35|ref}}</ref>

Throughout the [[World Duel Carnival]]Soon after, their friendship becomes strained as Shark became focused on revenge on [[Quattro]] falls into the "wrong crowd" and continually told stops Dueling all together, but with persistence from Yuma , Shark agrees to Duel him again. Despite his "Don't get involved Numbers", Yuma loses to Shark, who then tells him to never interfere with me" when they methis life.<ref name="ep31ep10">{{episode|Yu-Gi-Oh! ZEXAL|31|ref}}</ref><ref name="ep34">{{episode|Yu-Gi-Oh! ZEXAL|34|ref}}</ref> When Yuma learns how violent Shark had becomeHowever, Yuma challenged him to a Duel, in which Yuma made no move to attack, and let disobeys this after learning of why Shark take his anger out on him. He was angry at Yuma's persistence and the Number's influence causes him grow more aggressive. Eventually, Yuma tells Shark he doesn't want to see the way he is now, shocking him, and is followed by his stomach growlingwas. As Shark watches Yuma The two then have a [[Tag Duel]] against [[Scorch]] and [[Tori Meadows|ToriChills]] shout at , also carried "Numbers" that supported each other. Despite that, Shark was able to aid Yuma, who protected him from any damage, he smiled and give him the final trump card that would defeat the darkness in his heart disappearedtwo brothers. Shark then cancelled the Duel, claiming that seeing As a sign of respect for Yuma being an "idiot" made him lose his drive. Before walking away, Shark tells Yuma that he would meet allowed him in to keep the finals and they exchanged smilescard he won with.<ref name="ep46ep11">{{episode|Yu-Gi-Oh! ZEXAL|4611|ref}}</ref><ref name="ep12"/>

During the WDC party, [[Mr. Kay]] made a remark that Shark had changed due to Yuma tried looking for Shark, showing his concern for Shark, 's influence and because now he has something to ask him, but couldn't find himsees Yuma as a friend and ally.<ref name="ep50ep22">{{episode|Yu-Gi-Oh! ZEXAL|50|ref}}</ref> During the finals of WDCAlthough friends, Yuma stumbles across Sharkdoesn's Duel with [[Quattro]] and stayed t hang around Yuma as much as his other friends, due to his aloof nature, but is shown to cheer have a soft spot for him on. When In addition, Shark Summoned "[[Number 32: Shark Drake]]"often reflects on his time with Yuma, even watches Yuma worried about from afar when he sees him due to the influence of the "Number", and cried out to Shark as he was brutally attacked eight times by Quattro.<ref name="ep56ep22"/>{{episode|Yu-Gi-Oh! ZEXAL|56|<ref}}<name="ep41"/ref> As the Duel continuesDespite his distant nature, Yuma tried Shark is willing to open up to him (to an extent), but tends to pull Shark push him away from the influence of the sometimes.<ref name="Numberep31"/> In turn, but Yuma admires Shark eventually gives into itand worries about him if he does anything he thinks is wrong or dangerous. After When knowing things concerning Shark wins the Duel, Shark set Yuma would focus his revenge attention on [[Vetrix]] helping him and told Yuma he wonputting himself in harm't forgive him if got in his s way, straining their friendship once againeven sometimes ignoring or lashing out on his friends or Astral if they tried to stop him.<ref name="ep58ep35">{{episode|Yu-Gi-Oh! ZEXAL|5835|ref}}</ref>

In Throughout the semi finals, Yuma and Shark were matched-up to Duel each other, with Yuma eager to settle their rivalry. Unknown to Yuma, [[VetrixWorld Duel Carnival]] was influencing , their friendship becomes strained as Shark through the power of his became focused on revenge on [[crestQuattro]], but and continually told Yuma "Don't get involved with me" when they met.<ref name="ep31"/><ref name="ep34"/> When Yuma does notice learns how emotionless and different violent Shark is. During the Duelhad become, Vetrix made Shark think Yuma was the one challenged him to hurt [[Rio Kastle|his sister]]a Duel, in which Yuma made no move to attack, and let Shark hate Yuma and attack take his anger out on him ruthlessly. He was angry at Yuma tried to make Shark remember 's persistence and the times they Dueled together, how Shark tried protecting his [[EmperorNumber's Key]] from Kite, and how much their bond means to influence causes himgrow more aggressive. Eventually, Yuma also told tells Shark that his goal is to be Duel Champion and defeating Vetrix and [[Dr. Faker]] wasnhe doesn't worth losing want to see the way he is now, shocking him, and is followed by his stomach growling. To return As Shark to normal, watches Yuma took control of "and [[Number C32: Shark Drake VeissTori Meadows|Tori]]" shout at each other, he smiled and suffered while the "Number" tried to control him. Shark was able to regain darkness in his senses and begins to worry for Yumaheart disappeared. When deciding to save Shark or Astralthen cancelled the Duel, Yuma couldn't choose and said claiming that Shark is a very important friend to him. To save seeing Yuma, Shark got rid of his remaining [[Life Points]] to banish being an "Shark Drakeidiot" and give Yuma the victorymade him lose his drive. AfterwardsBefore walking away, Shark told tells Yuma how during the Duel that he could hear Yuma's voice and thanked Yuma for saving would meet him. Smiling, Shark then encourages Yuma to win in the finals and beat Vetrix, with Yuma promises to carry on his willthey exchanged smiles.<ref name="ep62ep46">{{episode|Yu-Gi-Oh! ZEXAL|62|ref}}</ref>

LaterDuring the WDC party, Yuma tried looking for Shark, when showing his concern for Shark awakes in the hospital , and sees that Yuma's Dueling with Vetrix in the [[Sphere Field]], because he begins has something to worry and rushes over to the [[Duel Coaster Stadium]]ask him, calling out Yumabut couldn's name as he goest find him.<ref name="ep67ep50">{{episode|Yu-Gi-Oh! ZEXAL|67|ref}}</ref>He then enters [[Heartland Tower]] to save Yuma and puts himself in danger in During the processfinals of WDC, showing how much he cares for him. Yuma stumbles across Shark was even willing to team up 's Duel with Kite and [[Orbital 7Quattro]] and stayed to rescue Yuma, despite his hostility towards themcheer him on. When Yuma challenges [[Dr. Faker]] to a Duel, Yuma gave back Shark Summoned "[[Number 32: Shark Drake (anime)|Number 32: Shark Drake]]", asking Yuma worried about him due to help him, and the latter joins Yuma with a smile.<ref name=influence of the "ep68Number" /> During the Duel, Yuma and cried out to Shark supported each other well with their cards, as well as Shark teasing Yuma when he's getting doubtswas brutally attacked eight times by Quattro.<ref name="ep69ep56">{{episode|Yu-Gi-Oh! ZEXAL|6956|ref}}</ref><ref name=As the Duel continues, Yuma tried to pull Shark away from the influence of the "ep70Number" /> When , but Shark eventually gives into it. After Shark wins the Duel, Shark set his revenge on [[Heartland TowerVetrix]] started to crumble, a piece of concrete was about to hit and told Yuma before Shark pushes he won't forgive him out of the if got in his way to protect him, taking the hit insteadstraining their friendship once again.<ref name="ep71ep58" />

When In the semi finals, Yuma and Shark were matched-up to Duel each other, with Yuma eager to settle their rivalry. Unknown to Yuma, [[Vetrix]] was influencing Shark through the power of his [[Barian Worldcrest]] began to target , but Yuma for does notice how emotionless and different Shark is. During the "Numbers"Duel, Vetrix made Shark worried for think Yuma's well-being and chases after him when he goes was the one to Duel hurt [[FenderRio Kastle|his sister]], even leaving his sister to go after which made Shark hate Yuma and attack himruthlessly.<ref name="ep74" /> When talking Yuma tried to Riomake Shark remember the times they Dueled together, Yuma learned that how Shark often talked about him to hertried protecting his [[Emperor's Key]] from Kite, and how much their bond means to his surprisehim. She Yuma also told Yuma Shark that she believed it's because of Yuma that her brother hadnhis goal is to be Duel Champion and defeating Vetrix and [[Dr. Faker]] wasn't changed and thanked worth losing him for being a good influence on Shark. Also, To return Shark began to spend more time with normal, Yuma as they started took control of "[[Number C32: Shark Drake Veiss (anime)|Number C32: Shark Drake Veiss]]" and suffered while the "Number" tried to walk home together after schoolcontrol him.<ref name="ep79">{{episode|Yu-Gi-Oh! ZEXAL|79|ref}}</ref> When Yuma fell towards a cliff ledge, Shark once again put was able to regain his life in danger senses and begins to try worry for Yuma. When deciding to save Yuma from falling,.<ref name="ep83" /> Recuperating in the hospitalShark or Astral, Shark was extremely upset how downhearted Yuma was acting couldn't choose and, in his typical gruff fashion, snapped at said that Shark is a very important friend to him. In order to get through to himTo save Yuma, Shark swiped the got rid of his remaining [[Emperor's KeyLife Points]] to banish "Shark Drake" and lured give Yuma into a Duelthe victory. With help from Astral, Yuma got his fighting spirit backAfterwards, much to Shark's happiness. When Astral told Yuma what Sharkhow during the Duel that he could hear Yuma's true purpose wasvoice and thanked Yuma for saving him. Smiling, Shark denied it, but then encourages Yuma was greatly touched. Trying to show his gratitudewin and beat Vetrix, with Yuma tried promises to give Shark a hug, only to be pushed away by himcarry on his will.<ref name="ep84ep62" />

After Later, when Shark came to accepting his fate as a awakes in the hospital and sees that Yuma's Dueling with Vetrix in the [[BarianSphere Field]], he was emotionally shattered at begins to worry and rushes over to the thought of becoming [[Duel Coaster Stadium]], calling out Yuma's enemy and distraught of breaking his bond and friendship with himname as he goes.<ref name="ep120ep67" />He then enters [[Heartland Tower]] to save Yuma and puts himself in danger in the process, showing how much he cares for him. Shark was even willing to team up with Kite and [[Orbital 7]] to rescue Yuma, despite his hostility towards them. When Yuma challenges [[Dr. Faker]] to a Duel, Yuma gave back Shark "Shark Drake", asking him to help him, and the latter joins Yuma with a smile.<ref name="ep121ep68" /> NeverthelessDuring the Duel, Yuma and Shark severed his friendship supported each other well with Yuma and claimed that it was their fate to become enemies. Howevercards, as well as Shark teasing Yuma didnwhen he't see him as an enemys getting doubts.<ref name="ep70" /><ref name="ep69"/> When the [[Heartland Tower]] started to crumble, but he a piece of concrete was willing about to fight hit Yuma before Shark pushes him out of the way to restore their bonds of friendshipprotect him, taking the hit instead.<ref name="ep124ep71" />

When the [[Barian World]] began to target Yuma for the "Numbers", Shark worried for Yuma's well-being and chases after him when he goes to Duel [[Fender]], even leaving his sister to go after him.<ref name="ep74" /> When talking to Rio, Yuma learned that Shark often talked about him to her, to his surprise. She told Yuma that she believed it's because of Yuma that her brother hadn't changed and thanked him for being a good influence on Shark. Also, Shark began to spend more time with Yuma as they started to walk home together after school.<ref name="ep79"/> When Yuma fell towards a cliff ledge, Shark once again put his life in danger to try to save Yuma from falling,.<ref name= "ep83" /> Recuperating in the hospital, Shark was extremely upset how downhearted Yuma was acting and, in his typical gruff fashion, snapped at him. In order to get through to him, Shark swiped the [[Emperor's Key]] and lured Yuma into a Duel. With help from Astral , Yuma got his fighting spirit back, much to Shark's happiness. When Astral told Yuma what Shark's true purpose was, Shark denied it, but Yuma was greatly touched. Trying to show his gratitude, Yuma tried to give Shark a hug, only to be pushed away by him.<ref name==="ep84" />

At first, After Shark had no knowledge of came to accepting his fate as a [[AstralBarian]], but Astral has respect for Sharkhe was emotionally shattered at the thought of becoming Yuma's Dueling skills enemy and the impact he has on Yumadistraught of breaking his bond and friendship with him.<ref name="ep10ep120">{{episode|Yu-Gi-Oh! ZEXAL|10|ref}}</ref><ref name="ep11ep121">{{episode|Yu-Gi-Oh! ZEXAL|11|ref}}</ref>Nevertheless, Shark severed his friendship with Yuma and claimed that it was their fate to become enemies. However, Yuma didn't see him as an enemy, but he was willing to fight him to restore their bonds of friendship.<ref name="ep12ep124"/>{{As of the final episode|Yu-Gi-Oh! ZEXAL|12|ref}}</ref>, his friendship with Yuma is once more reformed. If Shark becomes possessed by a "[[Number]]" card, Astral Rio, the former Barian Emperors, Kite and the Vetrix family allied with Yuma usually come into conflict with Shark and try again to save him from prevent an upcoming disaster in the card's dark influenceAstral World.<ref name="ep34">{{episode|Yu-Gi-Oh! ZEXAL|34|ref}}</ref><ref name="ep45">{{episode|Yu-Gi-Oh! ZEXAL|45|ref}}</ref><ref name="ep58">{{episode|Yu-Gi-Oh! ZEXAL|58|ref}}</ref><ref name="ep59">{{episode|Yu-Gi-Oh! ZEXAL|59|ref}}</ref><ref name="ep62">{{episode|Yu-Gi-Oh! ZEXAL|62|ref}}</ref>

Sometime between ===Astral===At first, Shark and Yuma becoming friends and the had no knowledge of [[World Duel CarnivalAstral]], but Astral has respect for Shark's learned of Astral's existence Dueling skills and knows how important the impact he is to has on Yuma.<ref name="ep62ep11">{{episode|Yu-Gi-Oh! ZEXAL|6211|ref}}</ref> <ref name="ep84ep10"/>{{episode|Yu-Gi-Oh! ZEXAL|84|<ref}}<name="ep12"/ref> Knowing If Shark is trustworthy and strong-willed, Astral has no problems letting him keep becomes possessed by a "[[Number 32: Shark Drake]]" card in his possession, Astral and Yuma usually come into conflict with Shark and try to save him from the card's dark influence.<ref name="ep68ep58"/><ref name="ep34"/><ref name="ep62"/><ref name="ep45">{{episode|Yu-Gi-Oh! ZEXAL|6845|ref}}</ref> After the Duel with [[Vector]], Shark can now see and hear Astral<ref name="ep72ep59">{{episode|Yu-Gi-Oh! ZEXAL|7259|ref}}</ref>, but they still have little contact with each other.

Once Sometime between Shark and Yuma becoming friends and the [[World Duel Carnival]], Shark's learned of Astral's theories about existence and knows how important he is to Yuma.<ref name="ep62"/><ref name="ep84"/> Knowing Shark is trustworthy and Rio being Nasch and Merag were confirmed truestrong-willed, he readily accepted that Astral has no problems letting him keep "[[Number 32: Shark Drake (anime)|Number 32: Shark was Drake]]" card in his enemy when he saw him possession.<ref name="ep68"/> After the Duel with the [[BarianVector]]s., Shark can now see and hear Astral,<ref name="ep124ep72"/>but they still have little contact with each other.

Once Astral's theories about Shark and Rio being Nash and Marin were confirmed true, he readily accepted that Shark was his enemy when he saw him with the [[Barian]]s.<ref name=== Kite Tenjo ==="ep124"/> Despite beings enemies now, he showed concern for Astral when he attempts to sacrifice himself.

During the Duel with [[Dr. Faker]], they developed a friendship and worked well with each other.<ref name="ep69ep70" /><ref name="ep70ep69" /><ref name="ep71" /> Although Shark holds little contact with Kite, they come together if the [[Barian World]] poses a big enough threat, but they have a tendency to argue with one other.<ref name="ep75" /><ref name="ep83" /><ref name="ep95" /> Initially, Kite refereed to Shark by his first name, but as they were around each other more often, he began using Shark's nickname just as others do.<ref name="ep105" />

After Shark had sided with the [[Barian]]s as NaschNash, Kite readily accepted that he was now his enemy and was resolved to fight him if he had to.<ref name="ep126" />However, as of the final episode, they became friends and allies once again.

=== Quattro ===Shark's earliest acquaintance with [[Quattro]] was at the [[National Duel Circuit]], where he was Shark's opponent in the final match, which he won by disqualification. He becomes Shark's target of revenge when he revealed that he set Shark up for disqualification by placing his Deck so that Shark could see it, and was the one responsible for Rio's injuries.<ref name="ep26" /> Shark entered the [[World Duel Carnival]] in order to get revenge on Quattro, spending most of the time pursuing him. When they do meet, Quattro takes pleasure out of mocking Shark and provoking him, as it was part of the his family's plans to use Shark and make his hatred grow.<ref name="ep33" /><ref name="ep34" /> However, Quattro developed jealously towards Shark once he found out that [[Vetrix]] wanted Shark to defeat [[Dr. Faker]] instead of him. At the WDC party, Quattro confronted Shark out of anger, only to grow more irritated when Shark mocked him before leaving.<ref name="ep50" /> In the finals, they continued to provoke one another as Quattro led Shark to the "[[Magma Field]]" for their rematch Duel.<ref name="ep53" /><ref name="ep51" /> Out of frustration, Quattro brutally Dueled against Shark to show his father that he was better than him.<ref name="ep57" /> After Quattro lost to Shark, he apologized for his misdeeds and entrusted Shark with the task of defeating Vetrix, which only annoyed Shark. His revenge and anger then shifts to Vetrix, as he was the one who orchestrated the whole thing.<ref name="ep58" /> Shark later reunited with Quattro when he came to help him with Duel against [[Chironex]] and teamed up him. The two rivals developed a level of camaraderie, although they often traded insults to each other, which made [[Trey]] commented that it was hard to figure out if they were on good or bad terms.<ref name="ep114" /><ref name="ep115" /> When Shark sided with the [[Barian]]s as Nash and broke his bonds with humanity, Quattro was determined to Duel against the only person he called a friend in order restore the bonds Nash once had.<ref name="ep124" /> After Nash showed how Quattro's allies perished in their Duels with the Barians, Quattro was disgusted at how far Nash had fallen and accepted that he was no longer Reginald.<ref name="ep125" /> Although Quattro tried one last time to get "Reginald", back he was unsuccessful, and as his soul headed to the Barian World, the rivals bid a sad farewell to each other, with Nash promising to join Quattro in Hell after the war concluded.<ref name="ep126" /> However, they become friends once again after Yuma and Astral's duel. ===Dumon===During his tenure as Emperor of the [[United Lands of the Poseidon Ocean]], he had befriended a knight from another kingdom. This knight, Dumon, had become close with Nash, swearing to defend and fight alongside him and his [[Vector|enemies]].<ref name="ep120"/> Their friendship even continued on to their next lives, when the two men had been reincarnated as [[Barian]]s where Dumon would continue to serve Nash once again. Even after Nash had supposedly disappeared from the Barian world, Dumon (now leader of the [[Seven Barian Emperors|other Barians]]) held on to the hope their leader would return one day. Once [[Vector]] had mentioned the possibility of their lost leader being on Earth, Dumon became absolutely determined to find and bring his leader back.<ref name="ep99"/><ref name="ep108"/> Once it became apparent that Nash was indeed the human Shark, Dumon was able to convince him it was his destiny to join the Barians, and finally Nash had joined up with him once again.<ref name="ep121"/> ===Vector===Shark and Vector are arguably arch-enemies; having a mutual hatred spanning far back into the ancient past. In their past lives, Vector was the Prince of the nation that invaded the [[United Lands of the Poseidon Ocean]], which was ruled by Shark's past life– Nash. This made Vector personally responsible for slaughtering Nash's Kingdom using his monster army. On a more personal level, Vector's invasion forced Nash's sister [[Rio Kastle|Marin]] to sacrifice herself to summon [[Number 94: Crystalzero (character)|the Ocean God Crystalzero]], which was a source of enormous grief for Nash. When the two were eventually revived as Barians, their true memories were sealed away by [[Don Thousand]], so the duo did not recognize one another right away. However, their mutual hatred permitted even into their new identities, Nash disliking Vector for his constant defiance. Vector eventually went so far as to establish a "Point system" for every time Nash annoyed him (and absolutely everything Nash said or did annoyed him), finally deciding to betray his leader at 100,000,000 points.<ref name="ep131"/> Following his obtaining of "[[Number 73: Abyss Splash (anime)|Number 73: Abyss Splash]]" and the recovery of his memories, Shark eventually returned to the Barian side as Nash. At that point, he was well aware of his and Vector's previous relationship and menaces Vector from the start. Nash's distrust of Vector and his involvement with Don Thousand proved fortuitous when Vector eventually betrayed his leadership. Nash eventually fought Vector one final time in revenge for Vector's murder of the other Barian Emperors, especially [[Rio Kastle|Marin]]. Having witnessed many of his atrocities, he believed Vector to be soulless. However during his Duel against Yuma and Astral, Nash referred to the fallen Emperors, including Vector, as the friends he could not save. He also used Vector's "Number C10X" and even refused to detach the Xyz Material that was linked to Vector's soul, suggesting Nash saw him in a new light after his self-sacrifice.

==Decks==Sharkplays a 's earliest acquaintance with ''Xyz [[QuattroWATER]] was at the [[National Duel Circuit]], where he was SharkDeck's opponent in the final match, which he won by disqualification. He becomes Shark's target of revenge when he revealed that he set Shark up for disqualification by placing his Deck so that Shark could see it, and was the one responsible for Rio's injuries.<ref name="ep26ep53" /> Shark entered the consisting of monstrous looking sea creatures such as various races of sharks. He utilizes a [[World Duel CarnivalBurn]] strategy in order to get revenge on Quattro, spending most of quickly gain the time pursuing him. When they do meet, Quattro takes pleasure out of mocking advantage through cards such as "[[Submersible Carrier Aero Shark and provoking him, as it was part of the his family's plans to use (anime)|Submersible Carrier Aero Shark ]]" and make his hatred grow.<ref name="ep33[[Booming Urchin]]" /><ref name=, with a focus on using [[Level]] 3 [[Monster Card|monsters]], such as "ep34[[Big Jaws (anime)|Big Jaws]]" />to [[Xyz Summon]] [[Rank]] 3 [[Xyz Monster]]s.

HoweverShark uses cards that can counter "[[Number]]s", Quattro developed jealously towards Shark once he found out whether that be [[Vetrixnegate|negating]] wanted Shark to defeat their effects with "[[Black Ray Lancer (anime)|Black Ray Lancer]]" or taking [[Dr. Fakercontrol]] instead of himthem with "[[Splash Capture (anime)|Splash Capture]]". At the WDC partyAs his Xyz Monsters are Rank 3, Quattro confronted Shark out of anger, only their [[ATK]] tends to grow more irritated when Shark mocked him before leavingbe on the lower side.<ref name=He includes cards to decrease the [[ATK]] of his opponent's monsters such as "ep50[[Needle Sunfish (anime)|Needle Sunfish]]" /> In the finals, they continued to provoke one another as Quattro led Shark to the and "[[Magma FieldFriller Rabca (anime)|Friller Rabca]]" field to make up for their rematch Duelthis.<ref name=A cautious Duelist, he includes many cards to counter Spells and Traps, such as "ep51[[Sea King's Verdict]]" /><ref name=, "ep53[[Mystical Space Typhoon (anime)|Mystical Space Typhoon]]" /> Out of frustration, Quattro brutally Dueled against Shark to show his father that he was better than him.<ref name="ep57[[Plate Salvage]]" /> After Quattro lost to Shark, he apologized for his misdeeds and entrusted Shark with the task of defeating Vetrix, which only annoyed Shark. His revenge and anger then shifts to Vetrix, as he was the one who orchestrated the whole thing.<ref name="ep58[[Skull Kraken (anime)|Skull Kraken]]" />.

Shark later reunited with Quattro when he came to help him with Duel against After acquiring "[[KurageNumber C32: Shark Drake Veiss (anime)|Number C32: Shark Drake Veiss]] and teamed up him. The two rivals developed a level of camaraderie", although they often trade insults Shark's Deck shifted to include more Level 4 monsters in order to each other, which made Summon "[[TreyNumber 32: Shark Drake (anime)|Number 32: Shark Drake]] commented that it was hard to figure out if they were " and became more focused on good or bad terms.<ref name=the "ep114[[Shark (archetype)|Shark]]" /><ref name="ep115" /> When Shark sided with the [[Barianarchetype]]s as Nasch and broke all his bonds he had. Similarly, Quattro was determined to Duel against the only person he called a friend in order restore the bonds Nasch once had.<ref name=after acquiring "ep124[[Number 94: Crystalzero (anime)|Number 94: Crystalzero]]" /> After Nasch showed how Quattro's allies perished in their Duels with the Barians, Quattro was disgusted at how far Nasch had fallen and accepted that he was no longer Reginald.<ref name="ep125" /> Although Quattro tried one last time to get back "Reginald[[Number 73: Abyss Splash (anime)|Number 73: Abyss Splash]]", but was unsuccessful. With Quattro's soul going the Barian World, the rivals bid sadly farewell his Deck shifted to each other and Nasch promised to join Quattro in Hell after the war was finishedinclude more Level 5 monsters.<ref name="ep126" />

During ===Ancient Deck===In his tenure past life as King Nash, ruler of the [[United Lands of the Poseidon Ocean]], he had befriended Reginald Dueled [[Vector]] in a knight from another kingdom. This knight, Dumon, had become close with Nasch, swearing to defend and fight alongside him and his [[Vector|enemiesShadow Duel]]using stone tablet cards.<ref name="ep120">{{episode|Yu-Gi-Oh! ZEXAL|120|ref}}</ref>

Their friendship even continued on to their next lives, {{Decklist|Ancient Deck|effect monsters =* [[Eagle Shark (anime)|Eagle Shark]]<ref group=Notes name=search120>This card is seen in his Deck when the two men had been reincarnated as [[BarianVector]]s where Dumon would continue searches it to serve Nasch once againSummon "[[Mermaid Shark (anime)|Mermaid Shark]]" in [[Yu-Gi-Oh! ZEXAL - Episode 120|episode 120]]. Even after Nasch had supposedly disappeared from the Barian world, Dumon </ref>* [[Gazer Shark (now leader of the anime)|Gazer Shark]] x2* [[Seven Barian EmperorsMermaid Shark (anime)|other BariansMermaid Shark]]* [[Panther Shark (anime) held on to the hope their leader would return one day. Once |Panther Shark]]<ref group=Notes name=search120 />* [[VectorSaber Shark (anime)|Saber Shark]] had mentioned the possibility of their lost leader being on Earth, Dumon became absolutely determined to find and bring his leader back.<ref group=Notes name="ep99"search120 />{{episode* [[Silent Angler (anime)|Silent Angler]] x2* [[Spear Shark (anime)|Spear Shark]]|Yu-Gi-Oh! ZEXALxyz monsters =* [[Number 73: Abyss Splash (anime)|99Number 73: Abyss Splash]]|spells =* [[Edict of Atlantis]] x2<ref}}group=Notes name=searchhand120>One copy can be seen when Vector searches his Deck to Summon "Mermaid Shark" and another can be seen in his hand as he Summons "[[Number 73: Abyss Splash (anime)|Number 73: Abyss Splash]]", both in episode 120.</ref>* [[Sea Lord's Amulet (anime)|Sea Lord's Amulet]]<ref group=Notes name=search120 />* [[Shark Lair]]<ref group=Notes name=hand>This card can be seen in his hand as he Summons "ep108[[Number 73: Abyss Splash (anime)|Number 73: Abyss Splash]]"in episode 120.</ref>{{episode|Yu-Gi-Oh! ZEXAL|108|traps =* [[Overlay Wedge]]* [[Zeus' Breath]] x2<refgroup=Notes name=searchhand120 />}}</ref>

Once it became apparent that Nasch ===As Shark==={{Decklist||effect monsters =* [[Big Jaws (anime)|Big Jaws]]* [[Big Whale (anime)|Big Whale]]* [[Deep Sweeper (anime)|Deep Sweeper]]* [[Depth Shark (anime)|Depth Shark]]* [[Double Fin Shark (anime)|Double Fin Shark]]* [[Double Shark (anime)|Double Shark]]* [[Drill Barnacle (anime)|Drill Barnacle]]* [[Eagle Shark (anime)|Eagle Shark]]* [[Friller Rabca (anime)|Friller Shark]]* [[Hammer Shark (anime)|Hammer Shark]]* [[Hyper-Ancient Shark Megalodon (anime)|Hyper-Ancient Shark Megalodon]] x2* [[Jawsman (anime)|Jawsman]]* [[Needle Sunfish (anime)|Needle Sunfish]]* [[Panther Shark (anime)|Panther Shark]]* [[Saber Shark (anime)|Saber Shark]]* [[Shark Stickers (anime)|Shark Stickers]]* [[Sharkraken (anime)|Sharkraken]]* [[Shocktopus (anime)|Shocktopus]]* [[Silent Angler (anime)|Silent Angler]]* [[Spear Shark (anime)|Spear Shark]]* [[Starfish (anime)|Starfish]] x3* [[Skull Kraken (anime)|Skull Kraken]]* [[Tripod Fish (anime)|Tripod Fish]]* [[Xyz Remora (anime)|Xyz Remora]]|xyz monsters =* [[Black Ray Lancer (anime)|Black Ray Lancer]]* [[Number 17: Leviathan Dragon (anime)|Number 17: Leviathan Dragon]]<ref group=Notes name=No17anime>This card was indeed present in the human Deck in his first Duel against [[Yuma Tsukumo]]. It was later absorbed by [[Astral]] upon his loss against Yuma in [[Yu-Gi-Oh! ZEXAL - Episode 002|episode 2]].</ref>* [[Number 32: Shark Drake (anime)|Number 32: SharkDrake]]<ref group=Notes name=No32>This card is received from [[Trey]] in [[Yu-Gi-Oh! ZEXAL - Episode 034|episode 34]]. Though not shown on-screen, Dumon this card was able later absorbed by Astral upon his second loss to convince him Yuma in [[Yu-Gi-Oh! ZEXAL - Episode 062|episode 62]], as it was present among the "Numbers" [[Dr. Faker]] took from Yuma. Yuma subsequently gives this card back to Shark in [[Yu-Gi-Oh! ZEXAL - Episode 068|episode 68]].</ref>* [[Number 73: Abyss Splash (anime)|Number 73: Abyss Splash]]<ref group=Notes name=No73>This card is won from [[Abyss (character)|Abyss]] in [[Yu-Gi-Oh! ZEXAL - Episode 109|episode 109]].</ref>* [[Number 94: Crystalzero (anime)|Number 94: Crystalzero]]<ref group=Notes name=No94>This card is acquired in [[Yu-Gi-Oh! ZEXAL - Episode 109|episode 109]].</ref>* [[Number C32: Shark Drake Veiss (anime)|Number C32: Shark Drake Veiss]]<ref group=Notes name=chaos>This card is acquired in [[Yu-Gi-Oh! ZEXAL - Episode 058|episode 58]] through [[Xyz Evolution#Chaos Xyz Evolution|Chaos Xyz Evolution]].</ref>* [[Shark Caesar (anime)|Shark Caesar]]* [[Shark Fortress (anime)|Shark Fortress]]* [[Submersible Carrier Aero Shark (anime)|Submersible Carrier Aero Shark]]|spells =* [[Aqua Gate]]* [[Aqua Jet (anime)|Aqua Jet]]* [[Aqua Mirage]]* [[Armored Xyz (anime)|Armored Xyz]]<ref group=Notes name=present>This card is given to [[Yuma Tsukumo]] in [[Yu-Gi-Oh! ZEXAL - Episode 012|episode 12]] for having improved as a [[Duelist]].</ref>* [[Book of Moon]]<ref group=Notes name=flashback>This card is given to Shark in a flashback by his destiny to join the Barians, father in episode [[Yu-Gi-Oh! ZEXAL - Episode 114|114]].</ref>* [[Break Stream]]* [[Cascade Barrier]]* [[Deep Sea Attack]]* [[Different Dimension Deepsea Trench (anime)|Different Dimension Deepsea Trench]]* [[Edict of Atlantis]]* [[Falling Current (anime)|Falling Current]]* [[Fish Spawn]]* [[Freezing Point]]<ref group=Notes name=zero>Shark finds this card after [[Rio Kastle|Rio]] dropped it in [[Yu-Gi-Oh! ZEXAL - Episode 108|episode 108]] and finally Nasch had joined up with him once againincludes it in his Deck.</ref>* [[Monster Reborn (anime)|Monster Reborn]]* [[Mystical Space Typhoon (anime)|Mystical Space Typhoon]]* [[Plate Salvage]]* [[Salvage (anime)|Salvage]]<ref group=Notes name=handep1>This card can be seen in his opening [[hand]] in [[Yu-Gi-Oh! ZEXAL - Episode 001|episode 1]].</ref>* [[Sea Lord's Amulet (anime)|Sea Lord's Amulet]]* [[Sharkify]]* [[Shark Lair]]* [[Shark Spark]]* [[Shield Fin]]* [[Surface (anime)|Surface]]* [[Surging Erosion]]* [[Tri-Slice]]* [[Underwater Snow Prison]]* [[Upswell]]* [[Xyz Crown]]* [[Xyz Gift (anime)|Xyz Gift]]|traps =* [[Adapt to Adversity]]* [[Booming Urchin]]* [[Bubble Bringer (anime)|Bubble Bringer]]* [[Deep Current]]* [[Escape Lure]]* [[Extreme Pressure Power]]* [[Final Offering]]* [[Fish Rain (anime)|Fish Rain]]* [[Full Armored Xyz (anime)|Full Armored Xyz]]* [[Ghost Salvage]]* [[Heraldry Catastrophe]]<ref group=Notes name="ep121"Vetrix>{{This card is received from [[Vetrix]] in a flashback in [[Yu-Gi-Oh! ZEXAL - Episode 062|episode 62]]. It is [[Set]] in the same episodebut not activated.</ref>* [[Hide and Shark]]* [[Icy Crevasse (anime)|Icy Crevasse]]* [[Life Regeneration]]<ref group=Notes name=Set>This card is [[Set]] in [[Yu-Gi-Oh! ZEXAL- Episode 022|episode 22]], but is not [[activate]]d.</ref>* [[Sea King's Verdict]]* [[Shark Splash]]* [[Splash Capture (anime)|121Splash Capture]]* [[Torrential Reborn (anime)|Torrential Reborn]]* [[Xyz Dimension Splash (anime)|Xyz Dimension Splash]]* [[Zeus' Breath]]<ref}}group=Notes name=tsunami>This card was originally intended to be "[[Poseidon Wave]]", but in respect for the victims of the tsunami that struck Japan in 2011, its artwork and name were changed.</ref>}}

== Decks =As Nash==={{mainUpon regaining his identity and powers as a [[Seven Barian Emperors|Barian Emperor]], Nash continues to use the same Deck he used as a human, with the addition of his new "[[Number 10X|Over-Hundred Number]]", "[[Number 101: Silent Honor ARK (anime)|Number 101: Silent Honor ARK]]", along with its [[Number C101: Silent Honor DARK (anime)|upgraded form]]. He also supplements his Deck with "[[Rank-Up-Magic]]" cards such as "[[Rank-Up-Magic - The Seventh One (anime)|Rank-Up-Magic - The Seventh One]]", which lets him [[Rank-Up]] his "Over-Hundred Number" from the [[Graveyard]], [[field]] or [[Extra Deck]] and "[[Rank-Up-Magic Quick Chaos (anime)|Rank-Up-Magic Quick Chaos]]", a [[Quick-Play Spell Card]] which allowed him to instantly Rank-Up his "[[Number 73: Abyss Splash (anime)|Number 73: Abyss Splash]]" into "[[Number C73: Abyss Supra Splash (anime)|Reginald KastleNumber C73: Abyss Supra Splash]]". Nash is also able to perform a "[[Chaos Draw]]" which allows him to create and draw cards that allow him to counter his opponent's Decks}}strategy.

Shark plays a '''Xyz After [[WATERDon Thousand]] Deck'''<ref name=s defeat, Nash acquired the other six "Over-Hundred Numbers" and their "ep53Chaos"/> consisting of monstrous looking sea creatures such as various races of sharksversions. He utilizes a [[Burn]] strategy in order to quickly gain used another variant of this Deck, which focused on swarming the advantage through field with those "Numbers", using several support cards such as "[[Submersible Carrier Aero SharkChaos Hundred Universe]]" and , "[[Explosive UrchinDuo of the Seven Emperors]]", with a focus on using and "[[LevelHundred Summon]] 3 " to Summon them. The final goal of this is to Summon "[[Monster CardCXyz Barian Hope (anime)|monstersCXyz Barian Hope]]", such as a monster that can use the effects of all the "[[Big JawsNumber C10X|Chaos Over-Hundred Numbers]]" to [[Xyz Summon]] [[Rank]] 3 [[Xyz Monster]]s.

{{Decklist||effect monsters =* [[Big Jaws (anime)|Big Jaws]]* [[Boom Shark uses cards that can counter "]]* [[Cutter Shark]]* [[Depth Biter]]* [[Doppelganger Shark]]* [[Dream Shark (anime)|Dream Shark]]* [[Friller Rabca (anime)|Friller Rabca]]* [[Panther Shark (anime)|Panther Shark]]* [[Saber Shark (anime)|Saber Shark]]* [[Silent Angler (anime)|Silent Angler]]* [[NumberSilent Wobby (anime)|Silent Wobby]]s", whether that be * [[negateSkull Kraken (anime)|negatingSkull Kraken]] their effects with "|xyz monsters =* [[Black Ray Lancer(anime)|Black Ray Lancer]]* [[CXyz Barian Hope (anime)|CXyz Barian Hope]]" or taking * [[controlNumber 73: Abyss Splash (anime)|Number 73: Abyss Splash]] of them with "* [[Number 101: Silent Honor ARK (anime)|Number 101: Silent Honor ARK]]* [[Number C73: Abyss Supra Splash (anime)|Number C73: Abyss Supra Splash Capture]]"* [[Number C101: Silent Honor DARK (anime)|Number C101: Silent Honor DARK]]* [[Number C102: Archfiend Seraph (anime)|Number C102: Archfiend Seraph]]<ref group=Notes name=Don1000>This card is won from [[Don Thousand]] in [[Yu-Gi-Oh! ZEXAL - Episode 141|episode 141]]. As his </ref>* [[Number C103: Ragnafinity (anime)|Number C103: Ragnafinity]]<ref group=Notes name=Don1000/>* [[Number C104: Umbral Horror Masquerade (anime)|Number C104: Umbral Horror Masquerade]]<ref group=Notes name=Don1000/>* [[Number C105: Battlin' Boxer Comet Cestus (anime)|Number C105: Battlin' Boxer Comet Cestus]]<ref group=Notes name=Don1000/>* [[Number C106: Giant Red Hand (anime)|Number C106: Giant Red Hand]]<ref group=Notes name=Don1000/>* [[Number C107: Neo Galaxy-Eyes Tachyon Dragon (anime)|Number C107: Neo Galaxy-Eyes Tachyon Dragon]]<ref group=Notes name=Don1000/>* [[Submersible Carrier Aero Shark (anime)|Submersible Carrier Aero Shark]]|spells =* [[Aqua Jet (anime)|Aqua Jet]]* [[Card of Ascension]]* [[Chaos Barrier]]* [[Chaos Tempest Draw]]* [[Cross Draw of Destiny]]* [[Depth Eruption]]* [[Glory of the Seven Emperors]]* [[Hundred Summon]]* [[Infinity Tooth]]* [[Power Stream]]* [[Rank-Up-Magic Quick Chaos (anime)|Rank-Up-Magic Quick Chaos]]* [[Rank-Up-Magic - The Seventh One (anime)|Rank-Up-Magic - The Seventh One]]* [[Rank-Up Rising]]* [[Split Defender]]* [[Surface (anime)|Surface]]* [[Xyz Monsters are Rank 3, their Treasure]]|traps =* [[Chaos Hundred Universe]]* [[Depth Gardna]]* [[Draw of Fate (anime)|Draw of Fate]]* [[Duo of the Seven Emperors]]* [[Overlay Award]]* [[Overlay Connection]]* [[ATKOverlay Menace]] tends to be on * [[Rebirth of the lower side. He includes cards to decrease Seven Emperors (anime)|Rebirth of the Seven Emperors]]* [[ATKReincarnation of the Seven Emperors (anime)|Reincarnation of the Seven Emperors]] of his opponent's monsters such as "* [[Needle SunfishTidal Advantage]]" and "* [[Friller RabcaXyz Charge Up]]" to make up for this. A cautious Duelist, he includes many cards to counter Spells and Traps, such as "* [[Sea King's VerdictXyz Trip]]", "* [[Mystical Space TyphoonZeus' Breath]]", <ref group=Notes name=InfinityTooth>This card is sent from his Deck to the Graveyard via the effect of "[[Plate SalvageInfinity Tooth]]" and "in [[Skull KrakenYu-Gi-Oh! ZEXAL - Episode 137|episode 137]]".</ref>}}

After acquiring "===Childhood cards===In [[Number C32: Shark Drake VeissYu-Gi-Oh! ZEXAL - Episode 114|episode 114]]", in a flashback Shark's Deck shifted to include more Level 4 monsters in order to Summon "has when he remembers the times where he and [[Number 32: Shark DrakeRio Kastle]]" and became more focused on the lived at their old mansion, Shark received several cards from his father: "[[Shark Big Jaws (archetypeanime)|SharkBig Jaws]]", " [[archetypeDrill Barnacle (anime)|Drill Barnacle]]. Similarly", after acquiring "[[Number 94: Crystal ZeroSkull Kraken (anime)|Skull Kraken]]" , and "[[Number 73: Abyss SplashBook of Moon (anime)|Book of Moon]]", his Deck shifted to include more Level 5 monsters.

Even after learning he was Nasch, Shark still uses the same Deck he used before, ==Duels=={| class="wikitable card-list"|-! scope="col" | Opponent(s)! scope="col" | Episode(s)! scope="col" | Outcome|-| [[Vector]] || [[Yu-Gi-Oh! ZEXAL - Episode 120|120]] || Win (flashback)|-|[[Quattro]]|[[Yu-Gi-Oh! ZEXAL - Episode 012|12]]|Lose (Disqualified; flashback)|-| [[Bronk Stone]] || [[Yu-Gi-Oh! ZEXAL - Episode 001|1]] || Win|-| [[Yuma Tsukumo]] || [[Yu-Gi-Oh! ZEXAL - Episode 001|1]]-[[Yu-Gi-Oh! ZEXAL - Episode 002|2]] || Lose|-| [[Yuma Tsukumo]] || [[Yu-Gi-Oh! ZEXAL - Episode 010|10]]|| Win|-| [[Scorch]] and [[Chills]] || [[Yu-Gi-Oh! ZEXAL - Episode 011|11]]-[[Yu-Gi-Oh! ZEXAL - Episode 012|12]] || Win (with the addition [[Yuma Tsukumo]])|-| [[Kite Tenjo]] || [[Yu-Gi-Oh! ZEXAL - Episode 022|22]] || Lose|-| [[World Duel Carnival]] Duelist || [[Yu-Gi-Oh! ZEXAL - Episode 031|31]] || Win|-| [[Trey]] || [[Yu-Gi-Oh! ZEXAL - Episode 034|34]] || Win|-| [[World Duel Carnival]] Duelist || [[Yu-Gi-Oh! ZEXAL - Episode 046|46]] || Win|-| [[World Duel Carnival]] Duelist || [[Yu-Gi-Oh! ZEXAL - Episode 046|46]] || Win|-| [[Yuma Tsukumo]] || [[Yu-Gi-Oh! ZEXAL - Episode 046|46]] || No result|-| [[Green Coat Duelist]] || [[Yu-Gi-Oh! ZEXAL - Episode 051|51]] || Win ([[Duel Coaster]])|-| [[Sultan of his own Spells]] || [[Yu-Gi-Oh! ZEXAL - Episode 053|53]] || Win ([[Duel Coaster]])|-| [[Quattro]] || [[Yu-Gi-Oh! ZEXAL - Episode 057|57]]-[[Yu-Gi-Oh! ZEXAL - Episode 058|58]]|| Win ([[Magma Field]])|-| [[Yuma Tsukumo]] || [[Yu-Gi-Oh! ZEXAL - Episode 061|61]]-[[Yu-Gi-Oh! ZEXAL - Episode 062|62]] || Lose|-| [[Dr. Faker]]/[[Vector]] || [[Yu-Gi-Oh! ZEXAL - Episode 069|69]]-[[Yu-Gi-Oh! ZEXAL - Episode 071|71]] || Win (with [[Yuma Tsukumo]] and [[Kite Tenjo]])|-| [[Fender]]'s henchmen || [[Yu-Gi-Oh! ZEXAL - Episode 075|75]]|| Win (off-screen)|-| [[Art Stanley]] || [[Number 101: Silent Honors Ark KnightYu-Gi-Oh! ZEXAL - Episode 078|78]]|| Win|-|Number 10X[[Caswell Francis]] along and [[Flip Turner]] || [[Yu-Gi-Oh! ZEXAL - Episode 081|81]] || Win (with its [[Number C101: Silent Honors Dark KnightYuma Tsukumo]]; [[Skydiving Field]])|-|Number C form[[Rio Kastle]] and a new [[RankBronk Stone]] || [[Yu-Gi-Oh! ZEXAL - Episode 081|81]] || Win (with [[Yuma Tsukumo]]; [[Beach Volleyball Field]])|-| [[Tori Meadows]] and [[Cathy Katherine]] || [[Yu-Gi-Oh! ZEXAL - Episode 081|81]] || Win (with [[Yuma Tsukumo]]; [[Table Tennis Field]])|-| [[Yuma Tsukumo]] || [[Yu-UpGi-Oh! ZEXAL - Episode 084|84]]|| Lose|-Magic The Seventh One|[[Barian Rank]]-brainwashed students || [[Yu-Gi-Oh! ZEXAL - Episode 085|85]] || Win <span>(with [[Yuma Tsukumo]], [[Rio Kastle]], and [[Alito]])|-| [[Rio Kastle]] || [[Yu-Gi-Oh! ZEXAL - Episode 091|91]] || Win|-| [[Dumon]] || [[Yu-Gi-UpOh! ZEXAL -MagicEpisode 095|95]]-[[Yu-Gi-Oh! ZEXAL - Episode 098|98]] || No result ([[Sargasso the D.D. Battlefield (anime)|Sargasso the Different Dimension Battlefield]])|-| [[Rio Kastle]]/[[Abyss (character)|Abyss]] || [[Yu-Gi-Oh! ZEXAL - Episode 108|108]]-[[Yu-Gi-Oh! ZEXAL - Episode 109|109]] || Win|-| [[Chironex]] || [[Yu-Gi-Oh! ZEXAL - Episode 114|114]]-[[Yu-Gi-Oh! ZEXAL - Episode 115|115]] || Win (with [[Quattro]])|-| [[Quattro]] || [[Yu-Gi-Oh! ZEXAL - Episode 124|124]]-[[Yu-Gi-Oh! ZEXAL - Episode 126|126]] || Win|-| [[Vector]] || [[Yu-Gi-Oh! ZEXAL - Episode 136|136]]-[[Yu-Gi-Oh! ZEXAL - Episode 137|137]] || Win|-| [[Don Thousand]] || [[Yu-Gi-Oh! ZEXAL - Episode 138|138]]-[[Yu-Gi-Oh! ZEXAL - Episode 141|141]] || Win (with [[Yuma Tsukumo]])|-| [[Yuma Tsukumo]] || [[Yu-Gi-Oh! ZEXAL - Episode 141|141]]-[[Yu-Gi-Oh! ZEXAL - Episode 143|143]] || Lose|}

== References ==