He is the Demon King, the first of his kind,and the progenitor of all other demons in existence.Muzan is also the leader of the Twelve Kizuki,an organization of the twelve strongest demons in existence that serve directly under him.As the Demon King,Muzan can control all those who have assimilated his blood to become demons.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.