Doma

Douma is a member of the Twelve Demon Moons, holding the position of Upper Moon Two. When he first encountered Gyuutarou and Daki, he was Upper Moon Six.

History
Douma encountered the siblings Gyuutarou and Ume, the latter having been severely burned, while in the Red Light District. Noting that she was near death, the Upper Moon offered to turn the pair into Demons, challenging them to join the Twelve Demon Moons and become Upper Moons themselves.

Red Light District Arc
Having been summoned to a gathering of the Upper Moons, Douma questioned Akaza's lack of concern for him, placing a hand on his colleague's shoulder. He stated his worry for his comrades' safety, before engaging Gyokko in small talk about his pot and the one he had been given. An irritated Akaza told Douma to move his hand, punching him when he didn't immediately comply. Regenerating the damage almost instantly, Douma complimented his fellow Upper Moon, wondering if he had gotten stronger since their last meeting. Soon after, Kibutsuji Muzan arrived, and Upper Moon Two listened as his leader reported Gyuutarou's death. Douma apologized, wondering what kind of punishment Muzan would inflict on him, but was instead told that nothing was expected of him.

The eccentric Demon questioned this, but Muzan pointed out the continued existence of the Ubuyashiki family and the failure to find the Blue Spider Lily, causing Douma to concede that he wasn't the best at detective work. He later approached Gyokko, eager to accompany him on his new mission, but had the top half of his head destroyed by Akaza for not following their leader's orders.