If you liked
Dolly♥Kill Kill
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...then you might like
Gleipnir
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Dark tone & Violence/Gore is juxtaposed with Cute Dolls - very similar ideas and themes present. Incredibly similar art styles and story telling methods that include shounen battle tropes, but are not limited to such devices and put high importance on plot to move story forward. If you like one, highly likely you'll at least enjoy the other.
If you liked
Tengen Toppa Gurren Lagann
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...then you might like
Donten ni Warau
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Donten ni Warau and Tengen Toppa Gurren Lagann both involve the threat of incoming antagonists as an overarching plot. Both start off grounded in reality but then take a turn for over the top action, especially in the second half. The main characters while being unique to each series have similar relationships among themselves. Tenka and Kamina act as the older brother - mentor type, they're both heavily involved in the plot in the latter half of the series. Soramaru and Simon wish to be independent and strong without the help of their brother or 'bro', respectively. And finally, both convey and build the message that family and friends are what make individuals stronger through the act of encouraging and protecting each another.