If you liked
Darker than Black: Kuro no Keiyakusha
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...then you might like
Phantom: Requiem for the Phantom
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Both animes are very similar. The male protagonists are assassins working for a crime organization accompanied by a emotionless girl. Also They have supernatural powers that help them to kill people. The organization only used them as pawns then at a certain moment in the story, they must escape from that organization, looking to be free. In my opinion, both are very good animes and i liked them a lot.
If you liked
Kore wa Zombie desu ka?
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...then you might like
Rokujouma no Shinryakusha!?
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If you liked Kore wa Zombie Desu ka, I'm sure you'll enjoy Rokujouma no Shinryakusha. Both have girls living in the same place with the protagonist and the girls are not humans at all. I mean, in Kore wa zombie you've a necromancer from the hell, a magical girl, vampires ninja, etc. And in Rokujouma, you have (also) a magical girl, a ghost, a princess from another world and a woman from the depths of the earth. Both are good animes, it's worth, watch it.