 If you liked
Speed Grapher
|
 ...then you might like
Gantz
|
Dark and gritty with a fair amount of violence, as well as genetic mutations/evolutions in humans/robots that may give them monstrous qualities. Speed Grapher is more about corruption and vice, while Gantz is about violence begetting violence, but a fan of one series is likely to enjoy the other.
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Recommended by PirateKingz
These two dark violent anime deal with themes of the darker sides of human nature. They both have characters using superhuman powers to kill other powerful beings. They are similar in their graphic nature as they are both filled with violence, blood, gore and nudity.
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Recommended by Genocyberfanboy