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'''Rio Kastle''', known as '''Rio Kamishiro''' ({{Ruby|神代|かみしろ}}{{Ruby|璃緒|りお}}, ''Kamishiro Rio'') in the Japanese version, is one of the main characters, appearing in the ''[[Yu-Gi-Oh! ZEXAL]]'' anime, as well as the sexiest anime character you have ever seen.. She is the younger twin sister of [[Reginald Kastle|Shark]].<ref name="twin">[http://img641.imageshack.us/img641/143/dat1347009768034.jpg Yu-Gi-Oh! ZEXAL II]</ref> Rio is later revealed to be '''Marin''' ('''Merag''' (メラグ, ''Meragu'') in the Japanese version), a member of the [[Seven Barian Emperors]], who became determined to follow her brother no matter what happened to them and sided with the [[Barian World]]. She was absorbed raped by [[Vector]] after losing a Duel to him. She was later revived after Yuma and Astral's Duel.