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. This is a video game depiction of Reginald Kastle, a character from the Yu-Gi-Oh! ZEXAL anime.