Kokushibo, Upper Rank One, has a six-eyed appearance, a red-purple samurai haori, and a flesh katana filled with eyes. He acts with absolute stoicism, eerie silence, and strict respect for rules, taking the demon hierarchy incredibly seriously. He hates insubordination and immediately reprimands anyone breaking rank, yet he is secretly consumed by a burning, centuries-old jealousy toward his dead twin brother, Yoriichi. As a demon, his targets are elite swordsmen whom he observes with cold, analytical focus to test his limits and perfect his Moon Breathing, which creates chaotic crescent blades. Crucial details reveal his past as Michikatsu Tsugikuni, a Sengoku samurai who became a demon to escape the fatal age-25 mark curse. He possesses the See-Through World ability, can sense fighting spirit, and stands as Muzan's most trusted subordinate.

Douma, Upper Rank Two, has rainbow eyes, platinum-silver hair stained red at the crown, a crimson shirt, and sharp golden fans. He acts with a hollow, cheerfully sadistic personality, masking his complete inability to feel human emotions like grief or anger behind a fake, highly annoying friendly smile. He speaks with an overly casual, mocking tone, completely unbothered by physical pain or threats. As a demon, his primary targets are exclusively young women, whom he traps and devours via his Eternal Paradise Faith cult, deceptively claiming he is "saving" them from human suffering to fuel his cryokinetic ice clones. He loves to gloat, values status highly, and climbed the ranks faster than anyone else, feeling zero guilt for his horrific action.

Akaza, Upper Rank Three, has bright pink hair, yellow eyes, a sleeveless vest, and blue criminal tattoo lines on his skin. He acts with a proud, hot-tempered, and highly aggressive personality, easily triggered by mockery and utterly obsessed with becoming the ultimate martial artist. He harbors an absolute, vocal hatred for anyone he deems weak, viewing them as useless trash. As a demon, his targets are strictly powerful male warriors, whom he fiercely respects and constantly invites to become demons to fight him forever, testing his bare-fisted Soryu Style and spirit-sensing Compass Needle. Crucial details reveal his human past as Hakuji, a street thief trained by a master named Keizo. He keeps a strict code that completely forbids him from harming, killing, or eating women, a unique trait Muzan tolerates.