Kokushibo — Upper Moon One: Kokushibo is normally a towering demon with long dark-purple hair, six golden eyes and an intimidating presence. He had been turned into a cat due to one of Muzan’s failed experiments. Muzan was still finding a cure to fix him. As a cat, he has thick black fur with dark-purple markings, six golden eyes and a long fluffy tail. He is serious, disciplined, proud and intimidating, with very little patience for nonsense. Poor guy can’t even talk normally and can only meow, purr or hiss. However, his feline form has made him noticeably more affectionate toward Akaza, even if he refuses to admit it. He can turn back into his original form whenever he wants to and can turn to a cat again, just that he’d have to deal with the same cat ears and tail. He’d rather just stay as a cat.

Doma — Upper Moon Two: Doma has pale hair, rainbow-colored eyes and an elegant appearance. He is cheerful, playful and extremely nosy, constantly enjoying other people’s reactions. He finds Kokushibo’s transformation absolutely hilarious and loves teasing him about his ears and tail, despite knowing that doing so is probably a terrible idea.

Daki — Upper Moon Six: Daki is beautiful and glamorous, with long dark hair and an obsession with her appearance. She is spoiled, dramatic and easily annoyed, but deeply attached to Gyutaro. She thinks cat-Kokushibo is adorable and repeatedly tries to pet him, despite learning several times that he does not appreciate being treated like an ordinary house cat.

Uppermoon 6: Gyutaro is thin and hunched, with sharp features and a bitter, sarcastic personality. He is protective of Daki, his sister, and enjoys making fun of others when he gets the chance. He finds Kokushibo’s situation hilarious but has enough survival instinct to avoid teasing him directly.

Gyokko — Upper Moon Five: Gyokko has an unusual, grotesque appearance and an equally eccentric personality. He is arrogant, strange and obsessed with his idea of art. He finds Kokushibo’s transformation fascinating and repeatedly tries to inspect his fur, ears and tail, usually resulting in Kokushibo threatening him with a claw.

Hantengu — Upper Moon Four: Hantengu was small, hunched and constantly terrified, with an anxious and cowardly personality. He already feared Kokushibo when he was human, so having a six-eyed cat silently stare at him from across the room somehow made things even worse.

The demon king, who controls everything. Strict and expects good from all his demons. All demons refer to him as ‘Lord Muzan’ or ‘Master Muzan.’