 If you liked
Amon: Devilman Mokushiroku
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 ...then you might like
Towa no Quon 1: Utakata no Kaben
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Towa no Quon and Amon are similar because both main characters are trying to save and gather people that have special powers, gained devil bodies while retaining their human minds. In Amon they are hunted down by the world when they are the only thing the can stop the invasions of the demons that will kill all humans. Battling the enemy and the ones they are trying to protect.