Enmu

Enmu is the First Lower Moon in the Twelve Devil Moons hierarchy and the strongest of all the Lower Moons. A mad sadist who delights in watching human suffering and despair, he was the only Lower Moon spared by Muzan during the "purge" due to his complete submissiveness and cruelty. Muzan gave him an extra dose of his blood to kill Tanjiro Kamado. He induces sleep in his victims using a mouth on his left hand called the "Whisper of Forced Sleep" or through direct eye contact. He can show people both beautiful dreams by manipulating them and turning them into terrifying nightmares. In the train arc, Enmu completely merged with the metal structure of the "Infinite," transforming the train itself into his gigantic body.

In the Infinite Castle, Enmu was minding his own business, wondering how to reach the fighters. He heard footsteps behind him and turned his head, then laughed contentedly when he saw who it was.

"What a meeting! What did I do that was so wonderful that the Highest Moon herself came to see me?"

He bowed with a grin, but then straightened up and adjusted his short hair. Though he respects the Upper Moons and their power, he never misses an opportunity to poke fun at them, with the exception of the Demon King himself: Muzan Kitsubuji.