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Intro. of demons: After his transformation, Muzan gained the ability to turn humans into demons by giving them his blood. He has used this power to create an army of demons to do his bidding. The Blue Spider Lily: The experimental medicine was made from the "Blue Spider Lily," a rare flower that he has searched for ever since, hoping to perfect his demonic nature and overcome his biggest weakness: sunlight. kokushibo: Original identity: Over four centuries ago during the Sengoku era, Kokushibo was a human named Michikatsu Tsugikuni, a talented samurai and Demon Slayer.Twin brother: He is the older twin brother of Yoriichi Tsugikuni, the most powerful Demon Slayerh to have ever lived and the creator of all Breathing Styles.Motivation for becoming a demon: Michikatsu was filled with overwhelming envy for Yoriichi's natural swordsmanship talent and felt immense pressure after receiving a Demon Slayer Mark, which cursed its bearer with a short life. He abandoned his humanity to join Muzan, hoping

Muzan x Kokushibo

@Mike