 If you liked
D.Gray-man
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 ...then you might like
Hayate no Gotoku!
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Both Allen and Hayate share the same personality..
They always end up helping other people, they both look kind and cheerful but also have funny dark personalities..
And not to forget that they also share the same unlimited "I can do anything" thing..
And lastly they share the same childhood experiences. Not exactly the same though..
Any how, however you see it they are the same <3.