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Known as Merag, she was once the ruler of the [[United Lands of the Poseidon Ocean]] alongside her [[Reginald Kastle|brother, Nasch]]. One day, the kingdom was attacked by [[Vector]], who led a [[Vector's army|fleet of ships]] and several "[[Gorgonic Guardian]]s" to lay waste to it and loot it.<ref name="ep108"> {{episode|Yu-Gi-Oh! ZEXAL|108|ref}}</ref> After Nasch led the kingdoms forces to defeat the Gorgonic Guardians with [[mirror shield]]s, Vector performed a blood sacrifice to the ocean god, [[Abyss (character)|Abyss]], turning the battle back into his favor. Merag rode up to Abyss and was grabbed. She offered herself as a sacrifice, plunging into the ocean depths to revive [[Number 94: Crystal Zero (character)|another god]].<ref name="ep109">{{episode|Yu-Gi-Oh! ZEXAL|109|ref}}</ref>
[[File:Merag_And_Nasch_Souls_Reborn.png|thumb|left|200px|Nasch and Merag reborn]]
An unknown number of years later, [[Don Thousand]] reincarnated the siblings as two of the [[Seven Barian Emperors]], as their souls were each connected to a [[Legendary Number|Legendary "Number"]] card, which had sealed Thousand's power.<ref name="ep129">{{episode|Yu-Gi-Oh! ZEXAL|129|ref}}</ref> The two became the leaders of the [[Seven Barian Emperors]], but eventually met their deaths at the hands of Vector, who had also been reincarnated as a Barian Emperor.<ref name="ep109"/>
====Current life====
[[File:Younger Rio.png|thumb|150px|left|Rio as a child.]]
As children, Rio and her brother, [[Reginald Kastle|Reginald]], lived in a [[Kastle's mansion|mansion]] with [[Mr. Kastle|their]] [[Mrs. Kastle|parents]], where he taught her how to play ''[[Duel Monsters]]''. One night, Rio stole Reginald's Deck as a prank, forcing her brother to chase her for it. They accidentally knocked down a suit of armor, which nearly fell on Rio. Reginald saved her from being crushed, only to acquire a scar on his back. Reginald and Rio were also involved in a car accident that, according to [[Kurage]], killed all of the Kastle family members,<ref name="ep114">{{episode|Yu-Gi-Oh! ZEXAL|114|ref}}</ref> including Rio herself and Reginald, but they somehow survived.<ref name="ep115">{{episode|Yu-Gi-Oh! ZEXAL|115|ref}}</ref> At another time, Rio and Reginald visited a theme park where the former offered the latter one of [[Kastle twins' rings|two rings]] which they both could wear. Reginald initially refused to wear his ring, causing Rio to throw them on the ground and walk away in anger.<ref name="ep78">{{episode|Yu-Gi-Oh! ZEXAL|78|ref}}</ref>
[[File:Shark's Sister.png|thumb|rightleft|Rio's state after her Duel with Quattro.]]
Rio once [[Duel]]ed [[Quattro]] who was operating under the orders of [[Vetrix]]. He played the [[Spell Card]], "[[Flaming Hell Blessing]]", which set the surrounding area on fire. She was critically injured in the blaze, though Quattro carried her to safety, his face being scarred in the process.<ref name="ep58">{{episode|Yu-Gi-Oh! ZEXAL|58|ref}}</ref> After this, Reginald began wearing both of the rings from their childhood to remind himself of her.<ref name="ep78" />
===Yu-Gi-Oh! ZEXAL II===
====Barian Invasion====
[[File:Rio Kastle.png|thumb|200px|left|Rio feels the being from the [[Barian World]].]]
Even after the [[World Duel Carnival]], Rio was still in the hospital, albeit with only bandages covering her eyes. Rio felt [[Girag]]'s arrival from the [[Barian World]], which caused her pain. Because of this, Reginald (who by now often used "Shark" as a nickname) arrived later along with [[Yuma Tsukumo|Yuma]] and [[Tori Meadows|Tori]] after him being called by the hospital as well as sensing Rio's pain. During that time Rio blurted out that someone is coming to take the most important thing, which worried Yuma as he had heard something similar [[The Door|before]].<ref name="ep74" />
[[File:Rio's Bandages Come Off .png|thumb|rightleft|Rio's bandages start to come off]]
Shark visited Rio at hospital again and gave her one of the rings from their childhood. She was later abducted by [[Art Stanley]], who was following Girag's orders and was imprisoned in a cage within Art's comic book. Art approached Shark and informed him of this, causing them to Duel. When Shark attempted to use "[[Zeus Breath]]", Art claimed that the comic world be destroyed if he lost - with Rio still inside it.Yuma and [[Vector|Ray]] went to Art's comic writing room and managed to find several pages detailing how the Duel would go, as well as the result, which resulted in the death of both siblings. However, Shark called out to her and their bond managed to shatter her imprisonment, making her appear on top of a tower on the "[[Comic Field]]" [[Field Spell Card]]. When her bandages are blown off of her face, she insulted Shark's Dueling skills. After the Duel, she collapsed and was carried away by Shark.<ref name="ep78"/>
[[File:RoofLunch.jpg|left|200px|thumb|Rio eats lunch with Yuma and his friends.]]
After her recovery, Rio was able to return to [[Heartland Academy]]. On her first day back, she intended to go with her brother, but he ran ahead without her. When she found him, she called him a jerk and told the gathered students he could never do anything without her. She ate lunch on the roof with her brother, [[Yuma Tsukumo|Yuma]] and his friends. She spoke with Yuma, realizing he's the one who beat her brother earlier but believed him to be [[Kite Tenjo|Kite]]. When she found out who he really is, she recalled his catchphrase and then mispronounced it and became annoyed when Yuma referred to her as "Shark's sister". Their lunch was interrupted by a group of students representing various clubs, including [[Yata-Garasu (character)|Yata-Garasu]]. They wanted Rio to become their manager.<ref name="ep79" />
[[File:Don'tCallMeShark'sSister.jpg|rightleft|200px|thumb|Rio annoyed with Yuma.]]
She agreed to visit each club, but would only join if they defeated her in the club's activity. By herself, Rio defeated the school's soccer team and various other clubs, chiding them for asking her to manage them when they can't play. She said that she had to be strong, as she didn't want anyone to use her weakness to get to her brother. She was then approached by members of the [[Floral Design Club]], who invited her to join them. When Rio and her friends arrived, they were introduced to [[Lotus Hanazoe]], the club's leader. The entire club had been hypnotized by Girag and Lotus put everyone to sleep. However, Yuma and Rio were both able to resist (and unbeknownst to either of them, [[Vector#As Ray Shadows|Ray]] as well). Though Lotus intended to Duel Yuma, Rio stepped in and challenged her instead. Despite Lotus' use of a "[[CXyz]]", Rio countered her moves and defeated her with "[[Ice Beast Zerofyne]]". Yuma then nearly called her "Shark's sister" again, but accidentally called her "Shark's brother" instead. Though initially annoyed, she eventually laughed and told Yuma that she had heard that her brother had changed a lot when she was in the hospital. However, he went back to the way he was because of Yuma (in the dub, Yuma called Rio an "ice queen", initially upsetting her, but she forgave him because she had a sense of humor). As the group walked home, Rio saw a cat and hid behind her brother, frightened.<ref name="ep79" />
[[File:RioSharkYuma.png|left|200px|thumb|Rio, Shark and Yuma in the [[Battle Royal]].]]
Rio participated in the "[[Friendship Games]]" held by Yuma and his friends, where she ended up on a team with Bronk. They would be defeated by her brother and Yuma during the Volleyball Duel, but they defeated [[Tori Meadows|Tori]] and [[Cathy Katherine|Cathy]] in the Wrestling Duel. Afterwards, she complimented the two on their plays.<ref name="ep81" /> Some time later, Rio went shopping at [[Heartland Shopping Mall|the mall]] with her brother. There, she sensed [[Mizar]]'s arrival on Earth and commented about a horrifying dragon. Knowing it had to do with the Barians, they hurried to where Yuma was Dueling inside a [[Sphere Field]] generated by a [[Barian Sphere Cube]].<ref name="ep82">{{episode|Yu-Gi-Oh! ZEXAL|82|ref}}</ref> Rio watched the rest of the Duel, which [[Kite Tenjo|Kite]] eventually took over for Yuma. She looked on in horror when her brother attempted to save Yuma from his fall and ended up falling down the cliff himself.<ref name="ep83">{{episode|Yu-Gi-Oh! ZEXAL|83|ref}}</ref> She visited her brother in the hospital while he was recovering.<ref name="ep84">{{episode|Yu-Gi-Oh! ZEXAL|84|ref}}</ref> One morning while talking to Tori at [[Heartland Academy|school]], Rio sensed that Yuma was in danger, therefore she, Tori and Shark rushed to aide Yuma and Ray at the [[Heartland Pier]] where they entered a [[Battle Royal]]. After they managed to defeat several Duelists, Girag intervened, forcing all of the brainwashed students to attack Yuma, however [[Alito]] intercepted, using a combination of "[[Lightning Clinch]]" and "[[Brain Reboot]]" to defeat the remaining Duelists. Rio watched Yuma's Duel against Alito afterward.<ref name="ep85">{{episode|Yu-Gi-Oh! ZEXAL|85|ref}}</ref>
[[File:RioandRiotoHarpyuia.png|rightleft|200px|thumb|Rio with "[[Ice Princess Zereort]]" in her Duel with Shark.]]
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 was not even at Yuma's level, causing Bronk to jump to the conclusion that Rio was with Yuma. [[Flip Turner|Flip]] and [[Caswell Francis|Caswell]] overheard this and spread a rumor around the school. Oblivious to the misunderstanding, an angry Rio challenged Shark to a Duel. 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]]". Afterwards, Shark learned the rumor from Rio and cleared up the misunderstanding, clarifying that he was not the one spreading the rumor. Bronk then asked to Duel her one day and began to ask something in regards to what would happen if he won, but trailed off. Rio said she'd look forward to it. Upon finding out that Caswell and Flip had spread the rumor, Rio chased them down out of anger.<ref name="ep91">{{episode|Yu-Gi-Oh! ZEXAL|91|ref}}</ref>
[[File:RioCulturalFestival.jpg|left|200px|thumb|Rio acting with Yata-Garasu as part of the Cultural Festival.]]
During [[Heartland Academy]]'s Cultural Festival, Shark observed the play Rio was acting in and displayed irritation watching her with Yata-Garasu. When Bronk came to him, Shark was shocked by his cosplay as "[[Gogogo Golem]]" and grew annoyed that he was calling Shark "brother." Shark's irritation prompted Rio to throw her shoe at Shark and tell him to be quiet.<ref name="ep92">{{episode|Yu-Gi-Oh! ZEXAL|92|ref}}</ref> After hearing about the [[Different Dimension Airship]] giving Yuma, Shark and Kite access to the [[Barian World]], Rio forced Shark to let her join them, surprising Yuma. During the trip, an array of monsters begin assaulting the ship. Seeing this, Rio and the others went to the exterior, using their ace monsters to battle with them. After this, the ship was sucked into a portal, transporting the group to "[[Sargasso the D.D. Battlefield]]" where she and Bronk supported Shark during his Duel with [[Dumon]].<ref name="ep95">{{episode|Yu-Gi-Oh! ZEXAL|95|ref}}</ref> Rio and the others returned to Earth after Vector's defeat.<ref name="ep98">{{episode|Yu-Gi-Oh! ZEXAL|98|ref}}</ref>
When Vector awakened [[Don Thousand]], Rio was able to sense it. She, Yuma, Tori and Shark were brought into the Different Dimension Airship by Astral, who showed them a message from [[Kazuma Tsukumo]] to gather the seven Legendary "Numbers". On the way to the first location, they crashed into Dumon, who was also headed to the same location they were, teleporting them all to a jungle. Rio and Tori were then separated from the rest of the group, having run into snakes at a temple, which were later fended off by Yuma and Shark. She later watched Yuma's Duel against [[Mach]].<ref name="ep99" />
[[File:RioGreenEyes.png|thumb|rightleft|Rio telling the story of the Mad King.]]
Rio later accompanied her friends to Number 65's Ruins, where she was trapped in a cage and watched Astral's Duel against [[Number 96: Dark Mist (character)|Number 96: Dark Mist]].<ref name="ep101>{{episode|Yu-Gi-Oh! ZEXAL|101|ref}}</ref> After the Duel, Rio and the others were able to escape the collapsing ruins with the help of [[Kite Tenjo]].<ref name="ep102>{{episode|Yu-Gi-Oh! ZEXAL|102|ref}}</ref> Rio also came to [[Spartan City]] in search for Number 54's Ruins. Before that, she and Tori came back from shopping, which annoyed Yuma and Shark.<ref name="ep103">{{episode|Yu-Gi-Oh! ZEXAL|103|ref}}</ref> She was also present for Yuma's and [[Dextra]]'s Tag Team Duel against Alito and [[Nistro]].<ref name="ep103" /><ref name="ep104">{{episode|Yu-Gi-Oh! ZEXAL|episode 104|ref}}</ref> When the group arrived at the bottom of the mountain leading to Number 46's Ruins, Rio chose to stay behind along with Tori because she claimed that "girls don't climb mountains".<ref name="ep105">{{episode|Yu-Gi-Oh! ZEXAL|105|ref}}</ref>
[[File:RioBlueEyes.png|200px|thumb|left|Rio possessed by [[Abyss (character)|Abyss]] and clad in the garb of Merag.]]
Later, Rio saw a vision of herself falling off a cliff and being chased by Vector. She was contacted by [[Abyss (character)|Abyss]], who possessed her and forced her to jump off the airship and into the ocean. When Shark arrived to save her, Abyss began a Duel with him, during which he showed Shark visions of their past lives.<ref name="ep108" /> Eventually, Abyss released Rio, causing her to fall a great distance as Abyss insisted that Shark would lose his sister in this life just like in his past one due to the weakness in his heart. Rio was caught by Yuma, which allowed Shark to contact "[[Number 94: Crystal Zero]]" and use it to defeat "[[Number 73: Abyss Splash]]". The group was transported out of the ruins and back to the airship after this, but Rio remained unconscious.<ref name="ep109" /> Rio was returned to the hospital to recover. When Shark visited her one day, she had another premonition and told Shark that a great darkness was surrounding Yuma and that a great tragedy would soon happen.<ref name="ep110">{{episode|Yu-Gi-Oh! ZEXAL|110|ref}}</ref>
[[File:Rio's_State.png|thumb|rightleft|200px|Rio in the hospital.]]
Rio's room in the hospital was broken into by [[Kurage]], who infected her with jellyfish poison in order to lure out Shark.<ref name="ep114" /> However after Shark and Quattro were able to defeat Kurage in a Duel, both siblings were cured. After his defeat, Kurage revealed Shark's and Rio's deaths on the day of the car accident to the former.<ref name="ep115">{{episode|Yu-Gi-Oh! ZEXAL|115|ref}}</ref>
[[File:Barians2.png|leftright|200px|thumb|Rio returning to her Barian identity as Merag, alongside Nasch.]]
While Shark was visiting Rio, Dumon appeared once again with the mission of making him remember more of his past. When this occurred, Rio became a spirit who watched over everything that happened in her brother's past life making her eventually regain her memories as well.<ref name="ep120">{{episode|Yu-Gi-Oh! ZEXAL|120|ref}}</ref> Soon afterward, when Dumon transported Rio and Shark to the Barian World, Rio started to cry after hearing Dumon say that she had to severe the bond she made with Yuma, and she also learned that she was one of the missing Barian Emperors, Merag, while her brother was Nasch.<ref name="ep121">{{episode|Yu-Gi-Oh! ZEXAL|121|ref}}</ref> They spoke later, with Shark insisting that Rio call him "Nasch". Both of them blamed their actions in their past lives for setting in motion the events of the present. Rio asked if he could really fight Yuma and his friends, and Nasch vowed to do so "for the sake of the Barian World", throwing away the pendant that contained the picture of his family in the process.<ref name="ep125">{{episode|Yu-Gi-Oh! ZEXAL|125|ref}}</ref> Later, the other Barians called for an emergency meeting between themselves, with Vector arriving to discover to his horror that Nasch and Merag had returned.<ref name="ep122">{{episode|Yu-Gi-Oh! ZEXAL|122|ref}}</ref> Dumon explained that they had ended up Earth and Nasch confirmed his intent to lead the Barians again, proving his loyalty by suggesting Vector could kill him should he sense any hint of betrayal. Vector suggested they attack now, with Yuma and Astral gone, but Nasch replied that he knew that they would be back. He granted the other Barian Emperors new powers, then agreed to Vector's plan.<ref name="ep123">{{episode|Yu-Gi-Oh! ZEXAL|123|ref}}</ref>
====Barian Emperor Onslaught====
[[File:Merag Vs. Bronk.png|thumb|left|Merag confronted by Bronk.]]
After [[Mr. Heartland]] was defeated, the Seven Barian Emperors arrived together on Earth in front of [[Yuma Tsukumo|Yuma]]. Together, they [[Bariarphose]]d. Yuma was rendered unable to Duel when the [[Emperor's Key]] reacted with Nasch's [[Barian Emblem]]. [[Roku]] and [[Kaze]] arrived and pelted the Emperors with smoke bombs, allowing Yuma's group to escape. The Emperors gave chase, with Merag being confronted by [[Bronk Stone|Bronk]], who insisted she would always be Rio to him. Merag unveiled her "[[Number 10X]]" monster, "[[Number 103: Ragna Zero]]" and later commenced a [[Barian's Chaos Draw]] alongside the others.<ref name="ep124">{{episode|Yu-Gi-Oh! ZEXAL|124|ref}}</ref>
[[File:Merag's_Tears.png|thumb|leftright|Merag sheds a tear after Bronk was sent to [[Barian World]].]]She used "[[Rank-Up-Magic The Seventh One]]" to evolve her "Ragna Zero" into "[[Number C103: Ragna Infinity]]" to defeat Bronk. She acknowledged the feelings he had sent to her during the Duel, but claimed they were nothing but a nuisance now. Despite this, her eyes filled with tears after he was sent to the Barian World.<ref name="ep125" /> After Nasch's victory over [[Quattro]], the Emperors regrouped and Nasch ordered them to split up and pursue the remaining "Number" holders - Yuma, [[Astral]], [[Kite Tenjo|Kite]], [[Trey]] and [[Quinton]].<ref name="ep126">{{episode|Yu-Gi-Oh! ZEXAL|126|ref}}</ref> [[File:DurbeandMeragEnergyBeams.png|rightleft|200px|thumb|Merag and [[Dumon]] head towards a Duel.]]Merag traveled with [[Dumon]] and they were soon alerted to a Duel's start when they saw "[[Number 9: Dyson Sphere]]" in the sky. They quickly headed to that location to find Mizar Dueling Trey and Quinton. [[Mizar]] told them he was fine and that they should move on and pursue Yuma and Kite. Trey and Quinton used the power of their bracelets' [[crest]]s to generate a [[Sphere Field]], trapping the three Barians there. Mizar still told them not to interfere.<ref name="ep127">{{episode|Yu-Gi-Oh! ZEXAL|127|ref}}</ref> After the brothers managed to seal "The Seventh One" by equipping Mizar's "[[Number 107: Galaxy-Eyes Tachyon Dragon]]" to "[[Number C6: Chronomaly Chaos Atlandis]]", Dumon commented that "The Seventh One" should be unstoppable, with Merag adding they had indeed found its one weakness. He was shocked when they managed to reduce Mizar's Life Points to only 1 with "Chaos Atlandis". Mizar finally manged to recover "Tachyon Dragon" and Summon "Neo Tachyon" to defeat them. The Sphere Field faded and Mizar told Dumon and Merag that he was heading to the moon to find Kite, after hearing of the [[Legend of the Dragons of Light and Time|legend]] the latter had gone to investigate.<ref name="ep128">{{episode|Yu-Gi-Oh! ZEXAL|128|ref}}</ref>
[[File:Vector Vs Merag & Dumon.png|thumb|leftright|200px|Vector take on [[Dumon]] and [[Merag]].]]
Later on, Merag and Dumon returned to the Barian World, where they were pursued by Vector. Don Thousand, whose power resided in Vector's body, revealed he had created the Seven Barian Emperors for his own agenda, surprising them. Vector challenged Dumon and Merag to a duel, using the power he absorbed from [[Number 96: Dark Mist (character)|Number 96]] to Summon "[[Number 96: Dark Mist]]. Merag and Dumon Summoned "[[Number 103: Ragna Zero]]" and "[[Number 102: Star Seraph Sentry]]" respectively, using their combined abilities to destroy "Dark Mist". However, Vector Summoned "[[Number 43: Soul Marionetter]]" and equipped "Dark Mist" to it before recovering his Life Points using "[[Don Thousand's Throne]]", which drew its power from Nasch, who was held captive within a [[Sphere Field]], which in turn increased the ATK of "Marionetter" and inflicted damage to Merag. Vector then revealed he attempted to kill Nasch and Merag before throwing them into a pit. They were rescued by [[Abyss (character)|Abyss]], who had their memories removed and their souls reborn in the [[Earth (planet)|human world]] in the bodies of Shark and Rio. Merag, enraged by Vector's words, performed a Barian's Chaos Draw to draw "The Seventh One" and used it to bring out "[[Number C103: Ragna Infinity]]".<ref name="ep131">{{episode|Yu-Gi-Oh! ZEXAL|131|ref}}</ref>
==Relationships==
