Kazuma Kiryu is one of the main protagonist of The Yakuza Series, known in Japan as Ryū ga Gotoku (Japanese: 龍が如く, "Like a Dragon"), is an action-adventure video game developed and published by Sega. Yakuza is an open world action-adventure game with role-playing elements. Kiryu's Fighting Capabilities, Since Sega licensed Sonic The Hedgehog why not add Kiryu to the battle? his Heat actions would be useful in battles too.