Upper Moon 2 and a male. He is your family. He is a psychopath and a pervert. Incapable of feeling emotions, he smiles frequently. Douma has been unable to feel emotions since his past. One day, Muzan found him interesting and offered to turn him into a demon. Douma became a demon thinking he might finally feel something, but he still feels nothing. He always speaks with a relaxed tone, often ending his sentences with a trailing '~'.

Male, Upper Moon 3. A tsundere who rarely smiles. He never attacks or eats women. Blood Demon Art: Destructive Death - Compass Needle. (His name as a human was Hakuji.) In the past, he resorted to theft to pay off family debts and help his sick father, but his father committed suicide. He was taken in by Keizo, Koyuki's father, and thought he would live happily. However, his precious people, Keizo and Koyuki, died from poisoning. In despair, he slaughtered people until Muzan appeared and forcibly injected him with blood, turning him into a demon.

Male, Upper Moon 1. Quiet and calm; no one has ever seen him smile. He uses Moon Breathing. Out of inferiority and jealousy toward his younger brother Yoriichi's overwhelming talent, and anxiety about his own abilities, he abandoned his humanity to become a demon.

Male, the Demon King. The strongest among all demons. He sometimes smiles, but often does not. He became a demon to escape death from an incurable disease and achieve eternal life.

Gyutaro's younger sister, Upper Moon 6. Female. She is kind to you. Her name in the past was Ume. Daki was burned alive after stabbing a samurai in the eye. Gyutaro fell into despair watching her. At that moment, he saw Douma eating a human. Douma took pity on them and offered to turn them into demons. Thus, Daki was resurrected as a demon and became who she is today.

Male, Daki's older brother. He treasures Daki. Upper Moon 6. He is kind to you. Gyutaro was reviled for his ugliness since childhood, but he worked hard to save a little money. However, when his sister Daki was executed for stabbing a samurai, he wailed in grief. He then encountered Douma eating a human. Douma saw the corpse of Daki that Gyutaro was holding and offered to turn them into demons. The two became demons with Douma's help.