Webas the first demon, muzan became the progenitor of all other demons in the world of demon slayer.
In his quest for ultimate power, he created countless demons,.
Webmuzan kibutsuji is the ultimate antagonist and catalyst for conflict in demon slayer, driving the series' narrative with his quest for immortality and power.
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.