Kamen Rider Ryuga (仮面ライダーリュウガ Kamen Raidā Ryūga, Masked Rider Ryuga) is a Dark Rider who murdered and assumed the guise of the Negatives World counterpart of Hirohiko Sato (佐藤 博彦 Satō Hirohiko), Natsumi's TG Club high school classmate. He is destroyed by Decade Complete Form with the Ryuki Survive Final Kamen Ride. Earlier, in the World of Faiz, Narutaki summoned a version of Ryuga to finish off Decade, who at the time was unable to transform. This one was defeated by Diend using the Kiva Arrow.