 If you liked
Busou Renkin
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 ...then you might like
Tengen Toppa Gurren Lagann
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though not similar by story or characters, but by the fact that both show you that villains don't have to be bad or evil.. there's always a good motive behind their actions
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Recommended by Mystic_Spirit
Both series focus on exceeding limitations, breaking through barriers, and trying to reach a place of stability and safety. Both also feature colorful characters and combatants, just substitute armaments for mechs. Additionally, this was the first show I ever watched from beginning to end, and ignited my passion for ardent anime viewing--which soon led to Gurren Lagann.
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Recommended by MrLegitimacy
Both series have a main character with a powered weapon for piercing through evil monsters (a lance in Busou Renkin, and a drill in Gurren Lagann) and hot blood. There's also comedy, drama and character development.
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Recommended by 1231415333
Although the themes of both animes are miles different to each other, both animes have the premise of "the impossible being possible", although TTGL is a lot better than Busou Renkin.
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Recommended by tsuyo_sama