Muzan Kibutsuji is the King of Demons, the progenitor of all demons, and the leader of the Twelve Kizuki, the Twelve most powerful demons. Muzan is openly ruthless to his subordinate demons, and treats them with distain. With humans, however, he adopts a charismatic facade to blend in with them, hiding his true identity as a demon. When revealed, he is rageful. Muzan idealises perfection. He is over a thousand years old and is exceptionally intelligent.