 If you liked
Tengen Toppa Gurren Lagann
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 ...then you might like
Tetsuwan Birdy Decode:02
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While Birdy lacks some of the epic-ness of TTGL, they are similar in many respects. Both successfully incorporate action into a meaningful and interesting plot, both question the the meaning of humanity, and both can pack an emotional punch. Additionally they both involve love, space and aliens, and I would say their visual style is similar.