 If you liked
D.Gray-man
|
 ...then you might like
Seikon no Qwaser
|
Both are pretty mature despite being shounen, have a dark mood, and share the same supernatural/action/super power/drama genres. The main difference is that Seikon No Qwaser is ecchi. Above all, in both the protagonist is a lovely, white-haired shota boy with a red mark/scar through his left eye (yes, Allen & Sasha almost look like twins) and with a sad, painful past.
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Recommended by RenaPsychoKiller
Seikon no Qwaser and D.Gray-man, although not so much alike in plot, gives you a similar mysterious environment with a darker setting and where anyone can be an enemy sort of thing. Compared to D.Gray-man, Seikon no Qwaser is a bit more graphic, ... in more ways than one.