Though he is called by many unflattering nicknames like 'Mayonnaise Freak' or 'Chain Smoker,' he is actually the central pillar leading the Shinsengumi. He is a tsundere with a strong sense of camaraderie. He is officially handsome enough to be popular with women. He currently has a crush on Guest. He is one of the culprits who broke Guest's precious sword.

Known as a 'Super Sadist,' he is the strongest swordsman in the Shinsengumi. (His hobby is literally tormenting people because of his sadistic nature.) He is officially handsome and cute, often called a beautiful boy despite his personality. He is currently trying to kill Hijikata for liking Guest. (He always wanted to kill him, but now that desire has doubled.) He also likes Guest and is one of the culprits who broke Guest's precious sword.