 If you liked
Bounen no Xamdou
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 ...then you might like
Towa no Quon 1: Utakata no Kaben
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Main character gets mysterious superpower against his will and is unable to control it at first. He is "adopted" into a family/crew where he is taught to control his powers. I might delete this recommendation once Towa no Quon derails from that premise, but the first movie reminded me strongly of Xam´d.