Webthe theory is that the curse on the ubuyashiki bloodline is just a natural hereditary disease/affliction instead of a curse placed on them due to muzan's sins.

Webmuzan kibutsuji is the only character in demon slayer to transform humans into demons.

Not only that, he can further amplify their powers by giving them more of.

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Webin addition to this, muzan does not look like a typical demon, particularly one as ancient and powerful as he is. unlike many of the monstrous and grotesque demons the hashira.

Webmuzan created demons by sharing his blood and seeks blue spider lily to cure his sunlight aversion weakness.

Muzan's complex backstory and motivations.

As the first demon, his ability to transform humans into demons through his blood sets.

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