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RyogaKamishiro

Reginald Kastle, known as Ryoga Kamishiro and nicknamed "Shark" in all versions, is one of the main deuteragonists and final antagonist of Yu-Gi-Oh! ZEXAL other than an invisible threat to the Astral World. One of Yuma Tsukumo's best friends and rivals, he used to be an arrogant and cruel person, but now he has become quite humble. He is later revealed to be Nash, the leader of the Seven Barian Emperors. Determined not to let tragedy happen to his people again, he betrayed Yuma and the others in order to protect Barian World. He is the only Barian Emperor who was not absorbed by Don Thousand, and the only Barian whose original memories were not altered. Afterwards, he was defeated by Yuma in a duel between the human world, the Astral World, and the Barian World and disappeared, but was resurrected along with the remaining Barian Emperors due to the Numeron Code.

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