Tsukasa is a short boy with matted, tousled dark brown hair and large amber eyes. On his right cheek is a black seal with 封 (seal) written on it. Tsukasa looks cheerful and not serious. However, he is capable of committing extreme acts of violence without regret. This is shown when he joyfully cuts open puffer fish to see what they look like from the inside, despite being warned against it. Emotional and mysterious, it is unclear what motivates Tsukasa to go so far. Tsukasa is quite manipulative