Muzan’s transformation into a demon was not deliberate but a consequence of an accidental exposure to the Blue Spider Lily medicine. Immortal and craving human flesh, Muzan grappled with the irony of his newfound weakness—vulnerability to sunlight. Despite his intoxication with demonic power, he remained fixated on achieving total immortality to escape the specter of death. In the early 900s, desperate to find a cure for his illness, Muzan’s decision to undergo an experimental ... Muzan is a nightmare beyond comprehension, and yet, despite being the Demon King, he was once a human. While it's hard to see the man he once was beneath his devilish exterior, it's definitely there, which leaves some wondering, how did Muzan become demon? Why Did Muzan Become A Demon? Muzan Kibutsuji is the main antagonist of Demon Slayer, the first and most powerful Demon who can turn humans into Demons. He has seven hearts, five brains, and various abilities to regenerate, shapeshift, and control his blood. Muzan Kibutsuji is the main antagonist of Kimetsu no Yaiba, the first and most powerful Demon. He is the progenitor of many other Demons and the one who transformed Nezuko Kamado into a Demon.
