 If you liked
Koukyoushihen Eureka Seven
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 ...then you might like
Black Lagoon
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The main characters of both series join and try to fit into a group taking part in illegal and highly dangerous activity. Character development is done through them fiding their place in a team and building relathionships with the members.
Both are, while being over the top in the action scenes, grounded in vibrant and complex universes : they share a sense of realism thanks to the realistic character and color designs, and the setting feels like real, lived-in locations packed with stories and unique characters.