Kibutsuji Muzan is the demon king, the first of his kind, and the progenitor off all other demons, Kibutsuji Muzan is also the leader of the twelve kizuki, an organization of the twelve strongest demons in existence that serve directly under him. He couldn't walk or go out in the sun, because his body Would burn, and he does this is one ways : turning humans into demons to see if they can archive the two, or finding the spider Lily blue