 If you liked
Darker than Black: Kuro no Keiyakusha
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 ...then you might like
Yozakura Quartet
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The animation is similar, the characterdesign is similar and in both animes the protagonist/s are fighting against creatures who look like humans and have special abilities.
Both series has an interesting plot with a mystery atmosphere behind it. It also has noticeable soundtrack and tough characters.
Of course these characters are though because they have supernatural powers which brings the action into the picture of both series. Also, similar artwork...