Progenitor Demons, Kimetsu no Yaiba Fanon Wiki

Progenitor Demons (先 (せん) 祖 (ぞ) 鬼 (おに) , Senzo Oni?) are one of the five most ancient races, being a race of notoriously, supernatural, highly-temperamental, notoriously extremely elusive, neutral and immortal beings and some of the main supporting characters of Legends of Remnant and subsequent au universes. Unlike the artificial demons created by the Demon King, Muzan Kibutsuji, the Progenitor Demons are far more ancient and possess a variety of eye colors, hair colors and body features. Never

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