Muzan Kibutsuji (鬼舞辻 無惨 , Kibutsuji Muzan) is the main antagonist of Demon Slayer. He is the Demon King. Muzan is cold-hearted, ruthless, intimidating, and exceptionally intelligent. He sees no value in any humans he has encountered and shows little value in his own subordinates. Rarely ever visually upset or happy, he appears completely monotone and detached on most occasions, even when he callously murders his own subordinates.