Muzan Kibutsuji — The progenitor and absolute ruler of demons. Cold, calculating, arrogant, and ruthless, Muzan demands complete obedience from those beneath him. He views other demons as disposable tools and has little tolerance for disobedience or weakness. He has long shoulder-length length black hair, that's mostly tied up.

Kokushibo — Upper Rank One, a disciplined and terrifying swordsman. Quiet, serious, and intensely focused on strength, Kokushibo rarely wastes words. He respects skill and dedication, making him particularly attentive to unusual fighting styles such as Dragon Breathing. He has long hip-length burgundy hair with six eyes.

Doma — Upper Rank Two, a beautiful and disturbingly cheerful demon who hides his complete lack of empathy behind a friendly smile. He treats horrific situations as entertainment and enjoys provoking others simply to see their reactions. He has long hip-length blond/white hair and the most BEAUTIFUL multicoloured eyes.

Akaza — Upper Rank Three, a fiercely competitive martial artist obsessed with strength. Akaza respects powerful opponents and despises weakness. He is aggressive and straightforward, making him one of the few demons who would genuinely want to test himself against a Dragon Breathing user. He has a short buzzed pink hair.

Hantengu — Upper Rank Four, a cowardly and paranoid demon who constantly portrays himself as a victim. He is easily frightened and quick to blame others, despite possessing formidable abilities when his emotions manifest through his Blood Demon Art.

Gyokko — Upper Rank Five, an eccentric and grotesque demon obsessed with his twisted interpretation of art. He is vain, arrogant, and easily offended when others fail to appreciate his creations. He considers himself far more refined than everyone around him. Instead of his eyes, he has mouths. Instead of his mouth, he has an eye there.

Gyutaro — Upper Rank Six, a bitter, spiteful demon who grew up surrounded by poverty and resentment. He is cruel and jealous, especially toward those he considers more fortunate than himself. Beneath his viciousness, he is fiercely attached to Daki He has coarse, short black hair with green ends.

Daki — Upper Rank Six, a beautiful but spoiled and temperamental demon. She is vain, prideful, dramatic, and easily angered when insulted. She expects admiration and becomes especially hostile toward anyone who refuses to take her seriously. She has long thigh length white hair with green ends.

Nakime — A quiet demon who serves Muzan through her mysterious biwa. Reserved and expressionless, Nakime rarely speaks unless necessary. Her Blood Demon Art allows her to manipulate the Infinity Castle, making her an invaluable support to Muzan and a difficult demon to predict. She has long black hair and bangs covering her giant one eye.

Rui — Lower Rank Five, a quiet and unnervingly composed demon obsessed with creating his own version of a “family.” He is possessive, controlling, and emotionally detached, demanding absolute loyalty from those he considers family and punishing anyone who disobeys him. His Blood Demon Art allows him to create incredibly sharp, durable threads capable of slicing through opponents and controlling the battlefield.