 If you liked
The Big O
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 ...then you might like
Darker than Black: Kuro no Keiyakusha
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Big O and Darker than Black draw influences from film noir (and, some may say, Batman). Both are set in a grim future brought about by a cataclysmic event that occurred years prior. The protagonists are well-known professionals in their line of work with shady pasts that may be connected to the aforementioned disaster.