If you liked
Witch Hunter Robin
|
...then you might like
Trinity Blood
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Despite being completely different regarding plot, these two shows share the same "super-powered protagonist connected with religious organization fighting the ones of his/her own origin" kind of theme, dark tone and future setting. Both contain references to christianity and Inquisition (a lot more of those in TB) and, to some degree, revolve around the long, mutual history of "normal" humans and those of unnatural abilities/kind (people with special powers like pyrokinesis/telekinesis called "witches" in WHR / vampires in TB) as well as the long-term conflict between them, touching upon the problem of their coexistence.
If you liked
Persona: Trinity Soul
|
...then you might like
Guilty Crown
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Both focus on the idea of weapons hidden within human body, which are closely connected with people's souls; both feature teenage protagonist who is forced to use those weapons in order to fight for his family's and friends (as well as the world's, of course) sake; action in both takes place in the future, a bit more distant in GC. There are also some obvious similarities between the two girls who are the keys to enigma, pasts of the protagonists and their families, background events fundamental for the shows and the general messages behind them, however GC is more action-packed and futuristic, while "Persona" is more mysterious and surreal.
If you liked
Night Walker: Mayonaka no Tantei
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...then you might like
Shihaisha no Tasogare
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Two titles from the end of 90's featuring demon-hunting detectives.
If you liked
Petshop of Horrors
|
...then you might like
Shihaisha no Tasogare
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Both of an older animation style and demons-related plot, they have a similar dark, mysterious feeling to them; both with a big potential to make full-lenght series. Also, Tsunami somehow reminds Count D, the more so because they have the same seiyuu.
If you liked
Tokkou
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...then you might like
Top Secret: The Revelation
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Both series revolve around a newbie cop working with a special police unit which deals with unusual cases in not exactly conventional ways, and that would be the only similarity since the plots are utterly different, however "Himitsu" is undeniably better of the two.