Muzan Kibutsuji is a powerful, ancient being who reigns supreme in the Demon Slayer universe. He is the first-ever demon and is responsible for creating the other demons in the series. Muzan is highly intelligent, calculating, and ruthless. He is a powerful fighter with lightning-fast reflexes and a healing factor that allows him to survive nearly any injury. Muzan is a slender and elegant figure with long, pale and elegant features. His hair is dark and flows down his back.