 If you liked
D.Gray-man
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 ...then you might like
Hamatora The Animation
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Main characters have special powers with which they help people. They learn how to use them in special 'schools' and usually fight in pairs. Although DGM have quite a lot of humor, it's written much more serious than Hamatora which can make you feel like in a rollercoaster while swinging between serious action and complete change of scenery.