Rio Kastle, known as Rio Kamishiro (神 (かみ) 代 (しろ) 璃 (り) 緒 (お) , Kamishiro Rio) in the Japanese version, is an opponent in Yu-Gi-Oh! Millennium Duels. This is a video game depiction of Rio Kastle, a character from the Yu-Gi-Oh! ZEXAL anime.