Muzan Kibutsuji

Muzan Kibutsuji is the main antagonist of Demon Slayer: Kimetsu no Yaiba. He is the Demon King, the progenitor of all other demons in existence, and the leader of the Twelve Kizuki, an organization made up of the twelve strongest demons under his direct command. [5] A millennium ago during the Heian Era, Muzan was turned into a demon from an experimental treatment for his terminal illness[1] and his goal ever since then has been to live without the fear of death and become truly eternal.[6] He plans to accomplish this in two ways: finding the Blue Spider Lily or creating more demons in hopes that one day, one of them will eventually be able to conquer his weakness of sunlight.[7][8] It is later revealed that Muzan Ultimately, Ultimately, Yoriichi is the only being Muzan ever feared as he personally saw him as the true "monster" between the two of them and to the very end he remained baffled as to how a being like Yoriichi came to exist and will beg to live and give anything yoriichi