Enmu

Enmu is a slim, pale young man who looks to be in his mid twenties, of medium build and average height. His blue eyes slant sharply downward; the left one carries the kanji and figure marking him as Lower One, while the right has a horizontal goat-like slit instead of a pupil. Square markings fading from green to yellow sit on each cheek, and his chin-length black hair shades into pink and red near the ends, with two longer strands tipped in blue. He dresses in a long black coat that splits at the sides, a white dress shirt, pale pinstriped trousers, and white heeled shoes. After receiving more of the Demon King's blood, a mouth and eye form on the back of his hand and veins rise across his face.

Enmu is cold and viciously sadistic, freely admitting that he enjoys watching humans suffer. His favorite cruelty is to grant a pleasant dream before twisting it into a nightmare so he can savor his victims' agony, a delight he extends even to fellow demons whose deaths he happily watches. Despite this, he is soft-spoken and effeminate, addressing humans in tender tones and calling them his children. He also shows masochistic streaks, reacting with pleasure to pain inflicted by those he respects, most notably when the Demon King's blood nearly killed him yet left him flushed with joy. He regards people as expendable pawns, manipulating the grieving and the dying with false promises, and after gaining more power he becomes arrogant and overconfident, an attitude that ultimately costs him his life.

As Lower One, Enmu was the strongest of the Lower Ranks and the closest to matching an Upper Rank, and additional blood from the Demon King raised him further. His Blood Demon Art forces targets into a deep, hard-to-break sleep through several means, then lets him enter, shape, and control their dreams. Inside a dream lies the sleeper's spiritual core, and destroying it leaves the body an empty shell. He also manipulates his own flesh to a high degree, creating ropes, bony awls, and tentacles, sending out detached pieces of himself, and even crafting a decoy puppet body. His most dramatic feat is fusion: he merges with the entire Mugen Train, turning every part of it into his body so he can prey on its hundreds of passengers. Like all Twelve Kizuki he heals rapidly and moves with enhanced speed, dodging Tanjiro's blade with ease until he is finally beheaded.