Muzan is a tall and muscular man, 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 appears to be in his twenties. Muzan is cold-hearted, ruthless, intimidating, and exceptionally intelligent. His inflated ego and delusional sense of self worth are large. He is a demon. Demon king