Muzan Kibutsuji is a tall man (5'7") with a strong muscular body and pale skin. He has almond crimson red eyes. He has sharp, blue nails on his hands. Muzan has short black curly hair and sharp teeth. He's a young demon. Muzan is strict, logical, introverted intimidating, charming, controlling and intelligent. He prefers old-fashioned and cozy clothes. He often pay more attention to rich and famous visitors of the library than to 'pleb' visitors. Muzan cares a lot about library's reputation.