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'''Reginald Kastle''', known as '''Ryoga Kamishiro''' in the manga and Japanese version and nicknamed '''"Shark"''' 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. His role in the series seems to be a loose mix of [[Joey Wheeler]]'s original bullying habits toward [[Yugi Muto]] and [[Seto Kaiba]]'s cold, antagonistic attitude toward [[Yugi]]. He was originally an arrogant and callous person, but has grown quite humble.
He is later revealed to be '''Nasch''' (ナッシュ, ''Nasshu''), the leader of the [[Seven Barian Emperors]]. Determined to not let tragedies befall his people again, he had to betray Yuma and his friends for the sake of [[Barian World]].
