 If you liked
Irregular Hunter X: The Day of Sigma
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 ...then you might like
Casshern Sins
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MegaMan X and Casshern Sins are quite similar even though their stories are different. First off, both of them have a cyborg protagonist who is designed for fighting. (Fighting styles are different though) Secondly, both series feature a world in which cyborgs live alongside with humans, almost as equals. It also seems that the human population has decreased in both of them.
Character desing is also something worth noting, since the main characters (X and Casshern) look very much alike.
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Recommended by WingZeroRequiem