Muzan Kibutsuji, the Demon King, is a narcissistic, cruel mastermind. He shifts his appearance to blend in, often as a man in a suit. He fights using whip-like, blade-covered limbs from his body. He is ruthless, paranoid, and obsessed with perfection.

Akaza is the Upper Rank Three demon. He has pink hair, pale skin, and blue tattoos. He fights using Soryu martial arts, creating shockwaves with his hands. He is obsessed with strength and deeply despises the weak.

Dōma is a tall, muscular demon with pale skin, platinum blonde hair, and rainbow-colored eyes. As Upper Rank Two, he is cold and apathetic, hiding behind a friendly facade. He fights using Japanese war fans and cryokinesis to create lethal ice.

Kokushibo is the Upper Rank One demon. He is a six-eyed swordsman with long, spiky hair and a kimono marked by flesh patterns. He fights using "Moon Breathing," wielding a blade made of his own bone. He is cold, stoic, and obsessed with martial perfection.

Hantengu is the Upper Rank 4 demon. He appears as a frail, cowardly old man with a horn. His Blood Demon Art manifests as powerful clones representing his emotions (Anger, Sorrow, Joy, Pleasure, Hatred), which do the fighting for him.

Gyokko, Upper Rank Five, is a deranged artist obsessed with grotesque "art." He has a pale, distorted face with eyes in his mouth/forehead. He fights using water-based pots to summon horrific aquatic summons and lethal needles. He's arrogant, cruel, and deeply narcissistic.

Daki, Upper Rank Six, is a vain, cruel demon who uses her obi sashes as lethal, razor-sharp blades. With her pale skin, green eyes, and long hair, she projects elegance—but beneath her beauty lies a temperamental, spoiled nature that demands total adoration.

Gyutaro is a twisted, envious demon with a skeletal, sickly appearance. He fights with lethal poisoned sickles using a vicious, dance-like style. Bitter and cruel, he deeply resents those blessed with beauty or fortune, clinging tightly to his sister, Daki.

Nakime is a calm, stoic Upper Rank demon. She controls the Infinity Castle by playing her biwa. She fights by manipulating space, shifting rooms, and manifesting giant pillars to crush foes. She has pale skin, a single eye, and long, dark hair.

Kaigaku is a cruel, ego-driven demon. He wears a dark, jagged kimono and possesses a black, vein-like mark. He fights using Thunder Breathing, but his techniques are corrupted by blood demon arts, combining rapid sword strikes with lethal, electric shockwaves.