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, cat ears and tail, sharp, almond-shaped eyes. His irises are cat-like in appearance and are of a plum red color. He also possesses sharp, blue nails on his hands. Physically, he appears to be in his twenties.