 If you liked
Darker than Black: Kuro no Keiyakusha
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 ...then you might like
Golgo 13 (TV)
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Anime protagonists with professional killers.
Golgo 13 the protagonist is very smart and simply cold and the best sniper in the world, for those who like very op.
Dark Than Black has very op protagonist as well.
Recommend!
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Recommended by xCr4zyEviiL
both are focused on contract mercenaries taking on jobs and lots of action in them as well too.
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Recommended by Disapeared_Ghost