Rio Kamishiro is one of the main characters, appearing in the Yu-Gi-Oh! ZEXAL anime. She is the younger twin sister of Ryoga. Rio is later revealed to be Merag, 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.