 If you liked
D.Gray-man
|
 ...then you might like
Tegamibachi
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Both have almost the same kind of traces, aspects and world, besides the "dark" atmosphere they transmit. The action part is the same kind too.
I find D.Gray-man and Letter Bee quite similiar.
Lag and Allen both have special eyepower which they use on their journeys, both join an organization which makes 'em to go on journeys (Allen fightning akumas and Lag delivering letters) and the overall feeling of the series is quite similiar except that D.Gray-man is bit darker than Letter Bee.
The main protagonists are incredible similar in both looks and personalities. They both have a dark colour scheme, very well drawn uniforms for the main cast, and the overall feel and tone is similar. If you like one, you're very likely to enjoy the other.
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Recommended by adamantine
Not only do the main characters look a bit similar, but they also even both have a special power that make them unique members in their organizations. Both manga also have a similar dark atmosphere.
D.Gray-man and Tegami Bachi has secret organizations, a world full of mysteries, and a main protagonist with an unique power. In fact, their unique power becomes a prominent focus in the story as we discover its hidden secrets. Both series also contain non-romantic relationships, background storytelling about the main character's pasts, and inner demons that become part of their lives.