 If you liked
D.Gray-man
|
 ...then you might like
Owari no Seraph
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the way there's an agency to fight demons in dgm is similar to how there's an agency to fight vampires in ons.
Both series have an organization of superpowered badasses that fights evil creatures, and the other side is your typical evil monsters that have some sort of royalty ranking system and are generally sinister. There's also the five man band of main characters, and then a few others who fade in and out. The most striking similarity, however, is the general vibe. It's dark with some lighthearted moments. Not to mention the uniforms are very much similar.
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Recommended by Jennpocalypse
Both revolve around the conflict between humans and demonic beings (Akumas in "D.Gray-man" and vampires in "Seraph of the End"). While the demons of both shows are definitely evil, the organization fighting them aren't exactly the good guys either, even though the main characters certainly are. As such, you often end up second-guessing just who you're meant to be rooting for. The vampire nobles are also comparable to the Noah Family in terms of status and power.
I prefer "D.Gray-man", as it has better plot and more developed characters.
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Recommended by Joe_Devaney