 If you liked
Tengen Toppa Gurren Lagann
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 ...then you might like
Aquarion Evol
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Both series contain over-the-top gattai mecha action with an underlying or (in the case of Aquarion EVOL) well-pronounced love story.
The characters are relatively similar, without necessarily exemplifying tropes, and both series' characters noticeably have catch-phrases that represent their persona.
The series both possess a sense for the extravagant both demonstrated by mecha action and the character interactions.
On a side note, the main heroine has a mascot pet in both series - Boota in TTGL and Shush in Aquarion EVOL.