Doma (in Japanese: 童磨, Dōma) also spelt Douma, is a major antagonist in the manga/anime series Demon Slayer: Kimetsu no Yaiba. He is a member of the Twelve Kizuki, formerly holding the position of Upper Rank Six and currently holding the position of Upper Rank Two.

Doma is the misanthropic and nihilistic leader of the Eternal Paradise Faith, a cult that worships him as a god. Unlike his fellow Upper Ranks, he became a demon for no particular reason at all and would spend most of his life as a demon killing and devouring women, including Kotoha Hashibira and the Flower Hashira Kanae Kocho, making him the arch-nemesis of Kanae's sisters Shinobu Kocho and Kanao Tsuyuri, along with Kotoha's son Inosuke. The three of them would finally slay him during the Infinity Castle Arc, albeit at the cost of Shinobu's life.

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From the wiki page :3