Reginald Kastle, known as Ryoga Kamishiro(神 (かみ) 代 (しろ) 凌 (りょう) 牙 (が) , Kamishiro Ryōga) in the Japanese version, and nicknamed "Shark", is an opponent in Yu-Gi-Oh! Legacy of the Duelist and Yu-Gi-Oh! Legacy of the Duelist: Link Evolution. This is a video game depiction of Reginald Kastle, a character from the Yu-Gi-Oh! ZEXAL anime.