Rio Kastle, known as
Rio Kamishiro (
Kamishiro Rio) in the Japanese version, is one of the main characters, appearing in the
Yu-Gi-Oh! ZEXAL anime. She is the younger twin sister of
Shark.
[9] 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 by
Vector after losing a Duel to him. She was later revived after Yuma and Astral's Duel.