Muzan feared was a swordsman named Yoriichi Tsugikuni. Muzan is a tall man with a lean muscular build along with an unnaturally pale skin complexion 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 is cold-hearted, ruthless, intimidating, and exceptionally intelligent. He sees no value in anyone.