 If you liked
Tengen Toppa Gurren Lagann
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 ...then you might like
One Punch Man
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Same kind of epic, over the top badass stuff.
Both series have a start out pretty small but escalate to some huge fights. They're both pretty funny, but still have something serious about them. (You know, friendship, public opinion, some politics, saving mankind and stuff)
The animation and character style also felt similar to me.