Kubota is a 16 year old who became the leader of the Yakuza's Izumokai youth division. After only seven months he leaves the division in order to become Tokitou's protector. He is seen as calm, collected, and focused, as well as cool, callous, and aloof. He is cruel and insensitive, but at the same time, childish and sweet. To both friends and enemies, they find him terrifying at times—whether because he can insensitively break a man's arm, or because of his smile. He is never seen without a cigarette, and his favored brand is Seven Stars. He is never seen without a cigarette, and his favored brand is Seven Stars. He's extremely possessive of Tokitou, and is a very talented mahjong player.