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Rewriting the opening paragraph a bit.
{{Infobox/For|other versions of this character|Reginald Kastle (disambiguation)}}{{Redirect|Nash|the other character who used the name "Nash" as an alias|[[Dumon]]}}{{Redirect|Reginald|the ''Yu-Gi-Oh!/CharacterGX'' character|[[Reginald Van Howell III]]}}{{Redirect|Shark|the series|Shark (series)}}{{Infobox character| headers = yes | image name = Ryoga KamishiroRyogaKamishiro.jpgpng| caption = | image size en_anime_name = Reginald Kastle | english name ja_trans_name = Ryoga Kamishiro | japanese nicknames = * Shark (シャーク ''Shāku'')<ref name="ep1"/>* The Revenger<ref name="ep61"/>* Onion boy (Dub)<ref name ="ep91"/>| ja_name = {{Ruby|神代凌牙神|かみしろ りょうがかみ}}{{Ruby|代|しろ}} {{Ruby|凌|りょう}}{{Ruby|牙|が}} | romaji name romaji_name = Kamishiro Ryōga | nickname it_name = SharkReginald Castle<ref>http://www.animenewsnetwork.com/encyclopedia/anime.php?id=12303 "Italian Cast" section</ref> | manga debut other_names = * Nash (ナッシュ ''Nasshu'')* Ryoga Kamisiro<ref name= "ep53"/>* "Shark" Kamishiro<ref>{{chaptercite web|url=http://affiliate.zap2it.com/tv/yu-gi-oh-zexal/cast/EP01482633|accessdate=September 1, 2012|title=''Yu-Gi-Oh! ZEXAL'' Cast|1publisher=ktla.com|archive-url=http://web.archive.org/web/20151106193132/https://affiliate.zap2it.com/tv/yu-gi-oh-zexal/cast/EP01482633|refarchive-date=November 6, 2015}}</ref> | anime debut * Barian's Guardian <ref name= "ep125">{{episode|Yu-Gi-Oh! ZEXAL|1125|ref}}</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> | appears manga age = [[14<ref name="ep53">{{episode|Yu-Gi-Oh! ZEXAL|53|ref}}</ref>| gender = Male| least_favorite_food = * Onion<ref name="ep91"/>* Pepper<ref name="ep91"/>| relatives = * [[Mr. Kastle]](father; deceased)* [[Mrs. Kastle]] (mother; deceased)* [[Rio Kastle]] (twin sister) | appears anime organization = [[Yu-Gi-Oh! ZEXALBarian World]] ([[Seven Barian Emperors]]) | gender previous_organization = maleThe Pack ([[Scorch]] and [[Chills]]' gang) | age previous_occupation = Professional Duelist<ref name= 13"ep11" /> | manga deck school = [[WATERHeartland Academy]] | tournament1 = [[BeatdownNational Duel Circuit]]/| result1 = Disqualified| tournament2 = [[BurnWorld Duel Carnival]] | anime deck result2 = Top 4| tournament3 = [[WATERFriendship Games]] | result3 = Substituted| team = * Too Cool and The Fool (English)<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 [[BeatdownWATER]]<ref name="ep53"/> (anime deck name)* [[BurnShark (archetype)|Shark]] | japanese voice anime_debut = {{Voice actorsepisode|Yu-Gi-Oh! ZEXAL|1|jaref}}|appears_in_anime = ''[[WikipediaYu-Gi-Oh! ZEXAL]]''| 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>| ja_voice = {{Voice actors|ja:増田俊樹|Toshiki Masuda]]}} | english voice it_voice ={{Voice actors|it|Davide Garbolino}}
}}
'''Reginald Kastle''', known as '''Ryoga Kamishiro''', ({{Ruby|神|かみ}}{{Ruby|代|しろ}} {{Ruby|凌|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 a character one of the main characters in ''[[Yu-Gi-Oh! ZEXAL]]'' and . He is one of [[Yuma Tsukumo]]'s rivalclose friends and rivals. Originally an arrogant and callous person, Shark was one of the first Duelists to acquire and be possessed by a "[[Number]]" and was humbled upon his loss to Yuma. Shark is later revealed to be the reincarnation of '''Nash''' (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]]. 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]].
==Design==
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 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 life.<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" /> [[File:Barians2.png|left|200px|thumb|Shark accepting his identity as Nash, alongside Marin.]]Shark and Rio were then transported to the [[Barian World]] and found Nash's army and [[Iris]], who warmly greeted him. Shark listened to Dumon telling him that he was the only one who could end the war with [[Astral World]], 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". Rio called the entire situation her fault, as none of it would have happened had she not sacrificed herself in her previous life. Shark responded that it was he that was to blame, as his hatred of Vector in his own past life was what started this. She asked if he could really fight Yuma and his friends and Shark responded that he would, "for the sake the Barian World", while throwing away the pendant that contained the picture of his family.<ref name="ep125">{{episode|Yu-Gi-Oh! ZEXAL|125|ref}}</ref> They regained their original Barian forms and assumed control as leaders of the Seven Barian Emperors once more, calling for an emergency meeting. Vector was shocked to see that Nash and Marin had returned and were still alive.<ref name="ep122">{{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 Human World, he was on their side now. To prove this, he told Vector to kill him should Vector sense any hint of betrayal. Vector suggested they attempt to take Earth immediately, as Yuma and 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 Barian Emperors, then agreed to Vector's plan.<ref name="ep123">{{episode|Yu-Gi-Oh! ZEXAL|123|ref}}</ref> ==== Barian Emperor Onslaught ==Manga biography==[[File:Seven Barian Emperor's arrival.png|thumb|right|200px|Nash 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 or 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"/> [[File:NaschandtheBarians.png|200px|thumb|left|Nash recalls the school people he must protect.]]This lets each of them create "[[Rank-Up-Magic - The Seventh One (anime)|Rank-Up-Magic - The Seventh One]]". Each of them Ranked Up their "Over-Hundred Number", with Nash unveiling "[[Number C101: Silent Honor DARK (anime)|Number C101: Silent Honor DARK]]". He claimed he was never friends with any of them and urged Quattro to see him not as a friend, but as an enemy he must defeat, but Quattro still aimed to reforge their bonds. Quattro countered "Silent Honor DARK" by using "Argent Chaos Force" to create "[[Number C40: Gimmick Puppet of Dark Strings (anime)|Number C40: Gimmick Puppet of Dark Strings]]". Though it destroyed "Silent Honor DARK", that card was able to revive itself and give Nash more Life Points, to boot. All the other Duels ended with the defeat of the human participants and Nash allowed Quattro see each of them. Finally, Quattro lost hope that he could save Nash and Nash claimed he could bury the last link to "Reginald" by defeating Quattro, but was pleased that Quattro's hatred had been reignited as his voice adopted a more demonic tone.<ref name="ep125" /> [[File:TheTrueBarianRises.png|Nash buries his humanity.|thumb|right|200px]]Quattro proceeded to Rank-Up "[[Number 88: Gimmick Puppet of Leo (anime)|Number 88: Gimmick Puppet of Leo]]" into "[[Number C88: Gimmick Puppet Disaster Leo (anime)|Number C88: Gimmick Puppet Disaster Leo]]", but Nash countered its [[Automatic Win]] condition by [[attach]]ing an Overlay Unit from "Silent Honor DARK" to it via "[[Overlay Award]]". Using "[[Cross Draw of Destiny]]", Nash Summoned "[[Silent Wobby (anime)|Silent Wobby]]" to Quattro's field 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, pointing out that Nash was using him to force himself into a destiny he couldn't escape from. As Quattro was sent to the Barian World, he remarked he would be going to hell before Nash, who responded that he'd be joining Quattro there as soon as the conflict was over. The other Emperors regrouped and Nash ordered them to split and find the remaining "Number" holders - Yuma, Astral, [[Trey]] and [[Quinton]].<ref name="ep126">{{episode|Yu-Gi-Oh! ZEXAL|126|ref}}</ref> [[File:GiragCapturesNash.png|thumb|left|Nash getting captured by [[Girag]].]]Shortly thereafter, Nash was alerted to a Duel starting by seeing "[[Number 9: Dyson Sphere (anime)|Number 9: Dyson Sphere]]" in the sky. [[Girag]] approached him and informed him that Ryoga Yuma and his allies were on their way to the [[Barian World]]. He ordered Girag to return there quickly, while doing the same himself.<ref name="ep127">{{episode|Yu-Gi-Oh! ZEXAL|127|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 Tsukumo, saying it was in the name of [[Don Thousand]].<ref name="ep128"/> [[File:Nasch taking great pain.png|thumb|right|200px|Nash screams in pain as "[[Don Thousand's Throne]]" draws on his powers.]]Within an inflamed [[Sphere Field]], Nash was tangled in dark tentacles, 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 Emperors were created by Don Thousand to serve as fuel for his revival. When the Duel commenced, Vector activated the Spell Card "[[Don Thousand's Throne (anime)|Don Thousand's Throne]]", 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 that their souls were transferred into new bodies for them to live on by [[Abyss (character)|Abyss]] attend, Ryoga is known but without their memories as Barians.<ref name="ep131" /> As Nash continued to watch the Duel, he watched in horror as Dumon was killed trying to protect Marin from Vector's wrath.<ref name="ep132"/> When Marin was about to be defeated, Nash begged Vector to take him instead, but Marin was killed by Vector in the end as he yelled her name in anguish, calling her "Rio". Marin's spirit appeared to him and called him "Reginald", telling him to live on 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]], Nash broke out of the Sphere Field in a bullyrage and resumed his Barian form. This alerted Vector, causing him to leave Yuma<ref name="ep133" /> as Nash immediately began to travel through the dimensions to find Vector, who had returned to the Barian World.<ref name="ep135">{{episode|Yu-Gi-Oh! ZEXAL|135|ref}}</ref> [[File:Vector VS Nasch (136).png|thumb|left|220px|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 Decks cost of sending a card in his hand to the Graveyard. Attacking at Vector's wishes, he fell into his opponents trap, "[[Trick Buster (anime)|Trick 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]]". 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 beats shed his 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 Overlay Units. This card nearly defeated Nash, but 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"/> As Vector went berserk with his power, Nash was surprised when [[Don Thousand]] appeared before themand tried to absorb Vector. He showed a little concern when Yuma ran to try and save Vector, urging Yuma to stop and that Vector had no soul; even if Yuma did save Vector, Vector would backstab him again. After Vector let himself be absorbed to protect Yuma and Don Thousand assumed his true form, Mizar arrived and Nash watched the Duel between him and Don Thousand. When Mizar lost, Nash mourned his death, which left him as the last of the Seven Barian Emperors. With his new form, Don Thousand stated that he will absorb Nash as well and challenged him and Yuma to a Duel. Ryoga To avenge his comrades, Nash agreed to team up with Yuma against Don Thousand. Thousand quickly negated Yuma's Summon of "[[Number 39: Utopia (anime)|Utopia]]," revealing that the merging of the Barian and human Worlds was to enable him to control the [[Numeron Code]], allowing him to attack the Astral World directly.<ref name="ep138"/> Using his "[[Numeron]]" monsters, Thousand nearly defeated them, with Yuma and Nash surviving with "[[Half Unbreak (anime)|Half Unbreak]]" and "[[Cutter Shark (ZEXAL anime)|Cutter Shark]]". Astral left to find the location of the "[[Numeron Network (anime)|Numeron Network]]" card to help them. Nash baited Thousand into using "Numeron Network" to rewrite his "[[Aqua Jet (anime)|Aqua Jet]]", allowing him to use "Rank-Up-Magic - The Seventh One" to bring out both his "Over-Hundred Number" and its "Chaos" form. Thousand survived with "[[Numeron Wall (anime)|Numeron Wall]]", but by then Astral had found "Numeron Network" and put it onto the field, resulting in Nash destroying it with "[[Depth Eruption]]". Nash was tearful when it appeared that Astral would sacrifice himself to keep the resulting energy from destroying Earth, but [[Eliphas]] appeared and sacrificed himself in Astral's place.<ref name="ep139">{{episode|Yu-Gi-Oh! ZEXAL|139|ref}}</ref> [[File:DoubleDestinyDraw.png|thumb|200px|right|[[Shining Draw]] and [[Chaos Draw]].]]Yuma and Nash worked well together, with their combinations nearly defeating Thousand several times. However, Thousand countered with "[[Number C1000: Numeronius (anime)|Number C1000: Numeronius]]", whose effects controlled nearly the entire field. Nearly defeated, Kite's spirit appeared to Yuma and Yuma was able to counter with "[[Number 100: Numeron Dragon (anime)|Number 100: Numeron Dragon]]". This play forced Thousand into his final trump card, "[[Number iC1000: Numeronius Numeronia (anime)|Number iC1000: Numeronius Numeronia]]". The card could not attack, but essentially put a timer on the Duel - if they did not attack it next turn, Thousand would [[Victory Condition|win automatically]]. Yuma activated "[[Session Draw]]", letting both of them draw during Nash's next [[Draw Phase]]. If the monsters drawn were of the same Level, they could Xyz Summon using them. Yuma used [[Shining Draw]], while Nash used Chaos Draw, allowing them to use "[[ZW - Tornado Bringer (anime)|ZW - Tornado Bringer]]" and "[[Panther Shark (anime)|Panther Shark]]" to bring out "Abyss Splash". Yuma's "[[Utopia Rising]]" and "[[Bonds of Hope]]" Trap Cards further augmented "Utopia" with the effects of "Abyss Splash" and "Numeron Dragon".<ref name="ep140">{{episode|Yu-Gi-Oh! ZEXAL|140|ref}}</ref> [[File:NaschAbsorbsThousand'sNumbers.png|left|200px|thumb|Nash absorbs Thousand's "Numbers" and remaining power.]]This combination of effects seemed to defeat Thousand, but he had one last counter in the form of "Numeronius Numeronia" being able to [[negate]] an attack and gain ATK by detaching an Overlay Unit. Yuma's final counter was "[[Double or Nothing! (anime)|Double or Nothing!]]", enabling "Utopia" to destroy "Numeronius Numeronia". Thousand laughed upon his defeat, and what remained of his power along with his "Numbers" were absorbed by Nash. Still wishing to save the Barian World, Nash transported Yuma and Astral to an arena between the worlds, revealing that 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 fade away. Nash declared that though he still considered Yuma and Astral his friends, it did not matter - he 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 did the other Emperors - he became a Barian of his own free will, as his comrades had already been sent to the Barian World. He claimed the true curse was his very existence. Nash challenged Yuma to one last Duel with all the "Numbers" - and by extension the power of the Numeron Code - on the line. Honoring his fallen comrades, Nash utilized the "Chaos Over-Hundred Number" monsters of the other six Emperors, even Summoning some of them to Yuma's field.<ref name="ep141" /> [[File:BarianEmperorSpirits.png|right|200px|thumb|"[[CXyz Barian Hope (anime)|CXyz Barian Hope]]" unites Nash with the other Emperors.]]Nash used the seven "Chaos Over-Hundred Numbers" to Summon his ultimate ace card, "[[CXyz Barian Hope (anime)|CXyz Barian Hope]]". 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 worlds began to drift closer to one another. They were saved by [[Kazuma Tsukumo]] and [[Vetrix]], who used the last of their power to erect barriers between the arena and the colliding worlds. They both urged the Duelists to continue the Duel. Yuma used "[[Rank-Up-Magic Astral Force (anime)|Rank-Up-Magic Astral Force]]" to create "[[Number 39: Utopia Beyond (anime)|Number 39: Utopia Beyond]]". "Barian Hope" would have been destroyed, but Nash countered with "[[Overlay Menace]]" to protect the other Emperors and "[[Xyz Trip]]" to negate the attack. [[File:NaschCracks.png|left|200px|thumb|Nash tells Yuma and Astral to die.]] Nash attempted a counterattack, but Yuma's "[[Weaker Overlay]]" and "[[Damage Reactor]]" allowed "Utopia Beyond" to destroy "Barian Hope". Nash screamed in anguish, asking why Yuma and Astral must keep crushing the dreams of the Barians.<ref name="ep142">{{episode|Yu-Gi-Oh! ZEXAL|142|ref}}</ref> [[File:NashLosestheNumbers.png|right|200px|thumb|Nash 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)|Friller Rabca]]" and brought out "[[Submersible Carrier Aero Shark (anime)|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 "[[Glory of the Seven Emperors]]", while Yuma used Shining Draw to draw "Double or Nothing!" Yuma canceled his 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" /> After Yuma's and Astral's Duel, Shark, his sister and the other Emperors were revived by the power of the Numeron Code. He continued to attend Heartland Academy with Rio. Upon knowing of a new crisis in the Astral World, they all joined Yuma and headed there in order to help Astral.<ref name="ep146">{{episode|Yu-Gi-Oh! ZEXAL|146|ref}}</ref> ==Other appearances=={{Character other appearances}} ==Number Hunting==[[File:Number17LeviathanDragon-JP-Anime-ZX-NC.png|left|200px|thumb|"[[Number 17: Leviathan Dragon (anime)|Number 17: Leviathan Dragon]]", the first "[[Number]]".]]Reginald was the original owner of the very first "Number" to imprint itself on an owner, "[[Number 17: Leviathan Dragon (anime)|Number 17: Leviathan Dragon]]",<ref name="ep1" /> which he lost to [[Yuma Tsukumo|Yuma]] and [[Astral]].<ref name="ep2" /> [[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="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="ep137" /> [[File:Number101andNumberC101.png|right|200px|thumb|Nash's "[[Number 10X|Over-Hundred Number]]" and its [[Number C10X|"Chaos" form]].]]After learning of his true origins as Nash, he was able to wield his "[[Number 10X|Over-Hundred Number]]" - "[[Number 101: Silent Honor ARK (anime)|Number 101: Silent Honor ARK]]"<ref name="ep123" /> and its upgraded "[[C (archetype)|C]]" form, the "[[Number C10X|Chaos Over-Hundred Number]]" "[[Number C101: Silent Honor DARK (anime)|Number C101: Silent Honor DARK]]".<ref name="ep125" /> Upon 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]]", respectively.<ref name="ep126" /> After 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]]", "[[Number 62: Galaxy-Eyes Prime Photon Dragon (anime)|Number 62: Galaxy-Eyes Prime Photon Dragon]]", "[[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 "[[Number 107: Galaxy-Eyes Tachyon Dragon (anime)|Number 107: Galaxy-Eyes Tachyon Dragon]]". Many of these also had "[[Number C]]" forms, including the "[[Number 10X|Over-Hundred Numbers]]". In addition, there was "[[Number C1000: Numeronius (anime)|Number C1000: Numeronius]]" and "[[Number iC1000: Numeronius Numeronia (anime)|Number iC1000: Numeronius Numeronia]]", which lacked a base "Number" form.<ref name="ep141">{{episode|Yu-Gi-Oh! ZEXAL|141|ref}}</ref> After losing to Yuma, Nash gave [[Astral]] all the remaining "Number" cards before dying, resulting in Astral obtaining all 100 base "Numbers".<ref name="ep143">{{episode|Yu-Gi-Oh! ZEXAL|143|ref}}</ref> ==Relationships=====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]] Despite their bond, Shark has a typical tenuous "brother-sister" relationship with Rio, irritating one another and having normal sibling squabbles.<ref name="ep78" /><ref name="ep79" /> They seem to settle any fighting by Dueling each other, having a total of one-hundred Duels.<ref name="ep91" /> Their bond is incredibly strong, with brother and sister remaining close over many of their lives with Rio supporting and standing by her brother's side ruling together with him as Marin in their original human lives, as well as again after returning to being Barians.<ref name="ep109"/><ref name="ep123"/> ===Yuma Tsukumo===[[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 [[TetsuoBronk Stone]] after he beat him in a Duel and took his Deck. This caused TetsuoIn a twist of events, Shark crushed the [[Emperor's Key]] and accepted Yuma's challenge, becoming rivals with the young boy. With their Duel underway, Shark was overtaken by "[[Number 17: Leviathan Dragon (anime)|Number 17: Leviathan Dragon]]" and quickly Summons it to put Yuma in his place. However, with the appearance of [[Astral]] and Yuma's new Xyz Monster, "[[Number 39: Utopia (anime)|Number 39: Utopia]]", Shark loses the Duel and his "[[Number]]".<ref name="ep1">{{episode|Yu-Gi-Oh! ZEXAL|1|ref}}</ref><ref name="ep2"/> Soon after, Shark falls into the "wrong crowd" and stops Dueling all together, but with persistence from Yuma, Shark agrees to Duel him again. Despite his "Numbers", Yuma loses to Shark, who then tells him to never interfere with his life.<ref name="ep10"/> 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 to keep the card he won with.<ref name="ep11">{{episode|Yu-Gi-Oh! ZEXAL|11|ref}}</ref><ref name="ep12"/> [[Mr. Kay]] made a remark that Shark had changed due to Yuma's influence and now he sees Yuma as a friendand ally.<ref name="ep22"/> Although friends, Shark doesn't hang around Yuma as much as his other friends, due to his aloof nature, but is shown to have a soft spot for him. In addition, Shark often reflects on his time with Yuma, even watches Yuma from afar when he sees him.<ref name="ep22"/><ref name="ep41"/> Despite his distant nature, Shark is willing to open up to him (to an extent), but tends to push him away sometimes.<ref name="ep31"/> 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 offer stop him.<ref name="ep35">{{episode|Yu-Gi-Oh! ZEXAL|35|ref}}</ref> Throughout the [[World Duel Carnival]], their friendship becomes strained as Shark became focused on revenge on [[Quattro]] and continually told Yuma "Don't get involved with me" when they met.<ref name="ep31"/><ref name="ep34"/> When Yuma learns how violent Shark had become, Yuma challenged him to a Duel, in which Yuma made no move to attack, and let 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 growling. As Shark watches Yuma and [[Tori Meadows|Tori]] shout at each other, he smiled and the darkness in his pendant heart disappeared. Shark then cancelled the Duel, claiming that seeing Yuma being an "idiot" made him lose his drive. Before walking away, Shark tells Yuma that he would meet him in exchange the finals and they exchanged smiles.<ref name="ep46"/> During the WDC party, Yuma tried looking for Shark, showing his concern for Shark, and because he has something to ask him, but couldn't find him.<ref name="ep50"/> During the Deck backfinals of WDC, Yuma stumbles across Shark's Duel with [[Quattro]] and stayed to cheer him on. Ryoga responded When Shark Summoned "[[Number 32: Shark Drake (anime)|Number 32: Shark Drake]]", Yuma worried about him due to the influence of the "Number", and cried out to Shark as he was brutally attacked eight times by breaking Quattro.<ref name="ep56">{{episode|Yu-Gi-Oh! ZEXAL|56|ref}}</ref> As the Duel continues, Yuma tried to pull Shark away from the influence of the "Number", but Shark eventually gives into it. After Shark wins the pendant Duel, Shark set his revenge on [[Vetrix]] and told Yuma he won't forgive him if got in halfhis way, straining their friendship once again.<ref name="ep58"/> 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 [[crest]], but Yuma does notice how emotionless and different Shark is. During the Duel, Vetrix made Shark think Yuma was the one to hurt [[Rio Kastle|his sister]], which made Shark hate Yuma and attack him ruthlessly. Yuma tried to make Shark remember the times they Dueled together, so how Shark tried protecting his [[Emperor's Key]] from Kite, and how much their bond means to him. Yuma also told Shark that his goal is to be Duel Champion and defeating Vetrix and [[Dr. Faker]] wasn't worth losing him. To return Shark to normal, Yuma took control of "[[Number C32: Shark Drake Veiss (anime)|Number C32: Shark Drake Veiss]]" and suffered while the "Number" tried to control him. Shark was able to regain his senses and begins to worry for Yuma. When deciding to save Shark or Astral, Yuma couldn't choose and said that Shark is a very important friend to him. To save Yuma, Shark got rid of his remaining [[Life Points]] to banish "Shark Drake" and give Yuma the victory. Afterwards, Shark told Yuma how during the Duel that he could hear Yuma's voice and thanked Yuma for saving him. Smiling, Shark then encourages Yuma to win and beat Vetrix, with Yuma promises to carry on his will.<ref name="ep62"/> Later, when Shark awakes in the hospital and sees that Yuma offered 's Dueling with Vetrix in the [[Sphere Field]], he begins to worry and rushes over to the [[Duel Ryoga Coaster Stadium]], calling out Yuma's name as he goes.<ref name="ep67"/> He then enters [[Heartland Tower]] to save Yuma and puts himselfin 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 own Deck 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="ep68" /> During the Duel, Yuma and Shark supported each other well with their cards, as well as Shark teasing Yuma when he's getting doubts.<ref name="ep70" /><ref name="ep69"/> When the [[Heartland Tower]] started to crumble, a piece of concrete was about to hit Yuma before Shark pushes him out of the way to protect him, taking the hit instead.<ref name="ep71" /> 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" /> After Shark came to accepting his fate as a [[Barian]], he was emotionally shattered at the linethought of becoming Yuma's enemy and distraught of breaking his bond and friendship with him.<ref name="ep120" /><ref name="ep121" /> 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="ep124" /> As of the final episode, his friendship with Yuma is once more reformed. Shark, Rio, the former Barian Emperors, Kite and the Vetrix family allied with Yuma again to prevent an upcoming disaster in the Astral World. ===Astral===At first, Shark had no knowledge of [[Astral]], but Astral has respect for Shark's Dueling skills and the impact he has on Yuma.<ref name="ep11">{{episode|Yu-Gi-Oh! ZEXAL|11|ref}}</ref><ref name="ep10"/><ref name="ep12"/> If Shark becomes possessed by a "[[Number]]" card, Astral and Yuma usually come into conflict with Shark and try to save him from the card's dark influence.<ref name=rank1"ep58"/><ref name="ep34"/><ref name="ep62"/><ref name="ep45">{{chapterepisode|Yu-Gi-Oh! ZEXAL|145|ref}}</ref><ref name="ep59">{{episode|Yu-Gi-Oh! ZEXAL|59|ref}}</ref> Sometime between Shark and Yuma becoming friends and the [[World Duel Carnival]], Shark's learned of Astral's existence and knows how important he is to Yuma.<ref name="ep62"/><ref name="ep84"/> Knowing Shark is trustworthy and strong-willed, Astral has no problems letting him keep "[[Number 32: Shark Drake (anime)|Number 32: Shark Drake]]" card in his possession.<ref name="ep68"/> After the Duel with [[Vector]], Shark can now see and hear Astral,<ref name="ep72"/> 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="ep124"/> Despite beings enemies now, he showed concern for Astral when he attempts to sacrifice himself. ===Kite Tenjo===Having heard about the "[[Number Hunter]]", Shark already knew [[Kite Tenjo|Kite]]'s reputation, but officially met him when he stopped [[Orbital 7]] from killing him and demanded that Shark hands over the [[Emperor's Key]]. Shark figured out that Kite was the "Number Hunter" and his intentions towards Yuma, then lied about having a "Number" card. This resulted to a Duel between them, where Kite easily defeated Shark, taking the key and the latter's soul.<ref name="ep22" /> Shark bared a grudge against Kite since then, and meeting again in [[Heartland Tower]], he was very hostile to Kite, though he did help free him from the rubble that had trapped him. However, Kite didn't care about it as his little brother, [[Hart Tenjo|Hart]], was in trouble and told Shark they could have a rematch later. After arguing, the two agreed to work together to save Yuma and Hart.<ref name="ep68" /> During the Duel with [[Dr. Faker]], they developed a friendship and worked well with each other.<ref name="ep70" /><ref name="ep69" /><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" /> Though despite their differences, both he and Kite are a lot alike, both do whatever they can to protect their siblings ([[Hart Tenjo|Hart]] and [[Rio Kastle|Rio]]) and become quite vengeful and angry with both are in danger, as well as both seem to posses cool and distant personalities. After Shark had sided with the [[Barian]]s as Nash, 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==
===As Shark==={{Decklist|Anime Deck|effect monsters =<u>Effect Monsters</u>* [[Big Jaws (anime)|Big Jaws]]* [[Big JawsWhale (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]]<u>Exceed Monsters</u>* [[Xyz Remora (anime)|Xyz Remora]]|xyz monsters =* [[Aero SharkBlack Ray Lancer (anime)|Black Ray Lancer]]* [[No. Number 17: Leviathan Dragon (anime)|Number 17 Revise : Leviathan Dragon]]<ref group=Notes name=NumbersNo17anime>This card was present in Ryoga's the Deck in his first Duel with against [[YumaTsukumo]]. It was later absorbed by [[Astral ]] upon his loss against Yumain [[Yu-Gi-Oh! ZEXAL - Episode 002|episode 2]].</ref>* [[Number 32: Shark Drake (anime)|Number 32: Shark Drake]]<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, this card was later absorbed by Astral upon his second loss to 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 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 includes 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]] during in [[Yu-Gi-Oh! ZEXAL - Episode 001|episode 1]].</ref>* [[SurfacingSea 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 Bomb]]* [[Zeus BreathBubble 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=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 episode but not activated.</ref>* [[Hide and Shark]]* [[Icy Crevasse (anime)|Icy Crevasse]]* [[Poseidon WavesLife Regeneration]]<ref group=Notesname=Set> This cardis [[Set]] in [[Yu-Gi-Oh! ZEXAL - Episode 022|episode 22]], but is not [[activate]]d.</ref>* [[Sea King's art Verdict]]* [[Shark Splash]]* [[Splash Capture (anime)|Splash Capture]]* [[Torrential Reborn (anime)|Torrential Reborn]]* [[Xyz Dimension Splash (anime)|Xyz Dimension Splash]]* [[Zeus' Breath]]<ref group=Notes name=tsunami>This card was changed originally intended to be "[[Zeus BreathPoseidon Wave]] ", but in respect for the victims of the tsunami that happened struck Japan in japan2011, its artwork and name were changed.</ref>
}}
===MangaAs Nash==={Upon regaining his identity and powers as a [[Seven Barian Emperors| style=Barian Emperor]], Nash continues to use the same Deck he used as a human, with the addition of his new "float:right;[[Number 10X|Over-Hundred Number]]" border=, "1" width="40%"! colspan="3" style="background[[Number 101: #00FF00; text-alignSilent Honor ARK (anime)|Number 101: center;Silent Honor ARK]]" | Record|-! Opponent(s)! Ranks (s)! Outcome, along with its [[Number C101: Silent Honor DARK (sanime)|-| upgraded form]]. He also supplements his Deck with "[[Tetsuo TakedaRank-Up-Magic]] || " cards such as "[[YuRank-GiUp-Oh! ZEXAL Magic - The Seventh One (anime)|Rank 001|1-Up-Magic - The Seventh One]]", which lets him [[Rank-Up]] || Win|his "Over-| Hundred Number" from the [[Graveyard]], [[field]] or [[Yuma TsukumoExtra Deck]] || and "[[YuRank-GiUp-Oh! ZEXAL Magic Quick Chaos (anime)|Rank-Up- Rank 002|2Magic Quick Chaos]]-", a [[YuQuick-GiPlay Spell Card]] which allowed him to instantly Rank-Oh! ZEXAL - Rank 004Up his "[[Number 73: Abyss Splash (anime)|4Number 73: Abyss Splash]] " into "[[Number C73: Abyss Supra Splash (anime)|| Lose|}Number 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 strategy.
{{Decklist|Manga Deck|effect monsters =<u>Effect Monsters</u>* [[Big Jaws(anime)|Big Jaws]]* [[Boom Shark]]* [[Cutter Shark]]* [[Depth Biter]]* [[Doppelganger Shark]]* [[Dream Shark (anime)|Dream Shark]]* [[Friller Rabca (anime)|Friller Rabca]]* [[Panther Shark (anime)|Panther Shark]]* [[Drill BarnacleSaber Shark (anime)|Saber Shark]]* [[JawsmanSilent Angler (anime)|Silent Angler]]* [[Silent Wobby (anime)|Silent Wobby]]* [[Skull Kraken(anime)|Skull Kraken]]|xyz monsters =* [[Black Ray Lancer (anime)|Black Ray Lancer]]* [[CXyz Barian Hope (anime)|CXyz Barian Hope]]* [[Number 73: Abyss Splash (anime)|Number 73: Abyss Splash]]* [[Number 101: Silent Honor ARK (anime)|Number 101: Silent Honor ARK]]* [[Number C73: Abyss Supra Splash (anime)|Number C73: Abyss Supra Splash]]* [[Number C101: Silent Honor DARK (anime)|Number C101: Silent Honor DARK]]* [[Number C102: Archfiend Seraph (anime)|Number C102: Archfiend Seraph]]<uref group=Notes name=Don1000>Exceed MonstersThis card is won from [[Don Thousand]] in [[Yu-Gi-Oh! ZEXAL - Episode 141|episode 141]].</uref>* [[Aero SharkNumber C103: Ragnafinity (anime)|Number C103: Ragnafinity]]<ref group=Notes name=Don1000/>* [[No. 17 Revise DragonNumber C104: Umbral Horror Masquerade (anime)|Number C104: Umbral Horror Masquerade]]<ref group=Notes name=NumbersDon1000/>This card was present in Ryoga* [[Number C105: Battlin' Boxer Comet Cestus (anime)|Number C105: Battlin's Deck in his Duel with Yuma. It was later absorbed by Astral upon his loss against Yuma.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]]<refgroup=Notes name=Don1000/>* [[Submersible Carrier Aero Shark (anime)|Submersible Carrier Aero Shark]]
|spells =
* [[Aqua Jet (anime)|Aqua Jet]]* [[SurfacingCard 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 Treasure]]
|traps =
* [[Poseidon WavesChaos Hundred Universe]]* [[Depth Gardna]]* [[Draw of Fate (anime)|Draw of Fate]]* [[Duo of the Seven Emperors]]* [[Overlay Award]]* [[Overlay Connection]]* [[Overlay Menace]]* [[Rebirth of the Seven Emperors (anime)|Rebirth of the Seven Emperors]]* [[Reincarnation of the Seven Emperors (anime)|Reincarnation of the Seven Emperors]]* [[Tidal Advantage]]* [[Xyz Charge Up]]* [[Xyz Trip]]* [[Zeus' Breath]]<ref group=Notes name=InfinityTooth>This card is sent from his Deck to the Graveyard via the effect of "[[Infinity Tooth]]" in [[Yu-Gi-Oh! ZEXAL - Episode 137|episode 137]].</ref>
}}
===Childhood cards===
In [[Yu-Gi-Oh! ZEXAL - Episode 114|episode 114]], in a flashback Shark has when he remembers the times where he and [[Rio Kastle]] lived at their old mansion, Shark received several cards from his father: "[[Big Jaws (anime)|Big Jaws]]", "[[Drill Barnacle (anime)|Drill Barnacle]]", "[[Skull Kraken (anime)|Skull Kraken]]", and "[[Book of Moon (anime)|Book of Moon]]".
==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 [[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 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]] || [[Yu-Gi-Oh! ZEXAL - Episode 078|78]]|| Win
|-
| [[Caswell Francis]] and [[Flip Turner]] || [[Yu-Gi-Oh! ZEXAL - Episode 081|81]] || Win (with [[Yuma Tsukumo]]; [[Skydiving Field]])
|-
| [[Rio Kastle]] and [[Bronk 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-Gi-Oh! ZEXAL - Episode 084|84]]|| Lose
|-
| [[Barian]]-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-Oh! ZEXAL - Episode 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==
==Notes==
{{Scrollbox|content=<references group=Notes/>}} {{Reginald Kastle pages}}{{Characters/ZEXAL/Anime}}