Webmuzan’s complexity as an antagonist lies in the delicate balance between his human qualities and demonic nature. While he may be a fearsome demon lord, he was. Webthe biggest villain of the series, muzan kibutsuji, is a figure clad in mystery. Fans have a lot of questions about where he came from, his motivations, and the source. Weborigin story reveals muzan's accidental transformation into a demon due to experimental treatment with blue spider lily. Muzan created demons by sharing his. Webnearly immortal in every sense of the word, muzan wasn't always a demon. A monster whose power makes even the deadliest demons quake with fear in his. 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.