If you liked
Darker than Black: Kuro no Keiyakusha
|
...then you might like
Psycho-Pass
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It's mostly the mood; very dark, very bleak worlds where people who work on the fringes have to deal with daily moral ambiguities. You keep watching both of them for similar reasons. You wan to find out about the pasts of the characters, as well as your questions about who is good and who is bad in the story. In that way they also have similar themes so I think you would likely enjoy them in the same way even though the premises are somewhat different.
If you liked
Ao no Exorcist
|
...then you might like
Hataraku Maou-sama!
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I liked them in a similar way. The main character is kind of evil but kind of not and also kind of lovably enthusiastic. Let's be honest there is the demon thing, there are demons in both being funny and morally ambiguous and some attractive demon guys being attractive. Also there is a love interest who is the really cute, girly, passive character with huge boobs. If you liked one character I feel that you would like the other.