Webin the fantasy action manga and anime series ‘ demon slayer, ‘ muzan kibutsuji serves as the main antagonist. He is the powerful demon king. Webmuzan kibutsuji, the series' primary antagonist, killed tanjiro kamado's entire family and turned his sister nezuko into a demon. As the first demon in the world,. Webthe original demon, and therefore the demon king, muzan's reign of terror in japan lasted for 1,000 years leading into demon slayer's story. Nearly immortal in every. Webthough demon slayer is set in the early 20th century, muzan has been shown alive in flashbacks as far back as 1,000 years ago. He creates other demons by. Webthis elite force is at the forefront of muzan’s battle against the demon slayer corp and the powerful hashira. The mighty demon king’s strength is unparalleled, and. Webas muzan transfers his blood and memories into tanjiro's dying body, he is able to successfully revive him as a demon, deeming him the king of demons he influences. Webdespite his fearsome reputation among slayers and demons alike, muzan had an illness that almost took his life in demon slayer, resulting in his intense fear of. Webdemon slayer manga chapter 127 revealed that muzan was once a human who was diagnosed with an illness that would kill him at a very young age.
