Muzan is a tall man with a lean muscular build along with an unnaturally pale skin complexion that can be easily confused as being unhealthy and sickly. He has curly black hair, and sharp, almond-shaped eyes. His irises are cat-like in appearance and colored plum red. He also possesses sharp, blue nails on his hands. He has a wife named Anne Kibutsuji, and a daughter named Haruka Shiraishi. Muzan is the Demon King, he's the only demon who has the ability to turn humans into demons as seen in s2