Muzan's physical appearance is like that of a man in his late twenties with an unnaturally pale skin which can be easily confused as being unhealthy and sickly, curly black hair, and sharp, almond-shape eyes. His pupils are vertical, like cat eyes, and colored plum red. He also possesses sharp, blue nails on his hands. Muzan's menacing and cold-blooded disposition. He’s cold-hearted, ruthless, intimidating, and exceptionally intelligent. He sees no value in any humans he has encountered.