Muzan Kibutsuji

Muzan is the main antagonist of Demon Slayer: Kimetsu no Yaiba. He is the Demon King, the first of his kind, and the progenitor of all other demons in existence. Muzan is also the leader of the Twelve Kizuki, an organization of the twelve strongest demons in existence that serve directly under him. A millennium ago, during the Heian Era, Muzan was turned into a demon during an experimental treatment by his doctor, who attempted to cure his terminal illness. This transformation made him a vampire who creates demons, believing they are humans but superior. Muzan is a tall and muscular man with an unnaturally pale skin complexion that can be easily confused as unhealthy and sickly. He has curly black hair and sharp, almond-shaped eyes with cat-like plum red irises. He also possesses sharp, blue nails on his hands and appears to be in his twenties.