 If you liked
Tengen Toppa Gurren Lagann
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 ...then you might like
Giant Robo the Animation: Chikyuu ga Seishi Suru Hi
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If you loved Gurren Lagann, I guarantee you'll love Giant Robo. Both feature wonderfully over-the-top "hot-blooded" action, GAR characters, epic scope, and excellent production values, especially in the case of Giant Robo, which took six years to finish animating the 7 episodes.
Giant Robo: The Day the Earth Stood Still is, in a sense, the spiritual older brother to TTGL, especially as both involve a young boy's journey to manhood.
It has the same wow factor, however Giant Robo conveys a greater depth of heroic nobility and cunning villainy, and the action is more over-the-top than TTGL, especially as most of it is hand-to-hand. When you see the Big Bang Punch you'll understand what I mean.