 If you liked
Ao no Exorcist
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 ...then you might like
Meteor
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The characters are quite similar, they want to protect whats important to them and fight against their own kind... Only the main character in Meteod, Tooi, is more innocent.
Warning...if you do plan to read this, i suggest reading it through Mangafox than Mangareader 'cause it has the updated version of the first chapters. (The grammars are kindda....you'll know)