Douma is outwardly friendly, possessing an approachable and charismatic air and described to talk and act in a calm and carefree manner by Kanae Kocho. However, it is soon revealed that Doma has psychopathic tendencies, adopting sick beliefs and habits like ruthlessly and happily murdering and devouring his cult's followers and young women under the belief that he is saving them from their suffering by letting them "live" inside his body.Under his carefree and unassuming demeanor, Douma is cold.