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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. He was originally an arrogant and callous person, but has grown quite humble. It was revealed that the real "Reginald Kastle" died (in the accident), then the soul of dead [[Barian]] Nasch continued his life before he died, making Nasch the current "Reginald Kastle", which could explain that "Nasch" and "Reginald Kastle" were originally different people, not the same. The real "Reginald Kastle" could be the descendant of Nasch from his past life, his ancestor. This could be the reason they look exactly same.
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]].
