Douma is a member of the Twelve Demon Moons, holding the position of Upper Moon Two, making him the third-strongest demon after Muzan and Upper Moon One. He has a very friendly attitude, and fights with a pair of metal fans. He is the founder of a cult known as the "Eternal Paradise Cult," and eats his followers, allegedly in order to release them from the pain of living.
He is the demon who killed Shinobu Kochou's older sister.
He is the demon who killed Inosuke Hashibira's Mother.
During the battle in the Infinity Castle, Douma kills Shinobu Kochou.
