 If you liked
Heppoko Jikken Animation Excel♥Saga
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 ...then you might like
Keroro Gunsou
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Two tales of attempted world domination, gone horribly wrong, with amusing consequences. Sgt. Frog is geared more towards kids but is watchable by adults. Excel Saga is aimed at adults, but might be appropriate for older kids, tweens and above. Except ep 26, which even surprised me with the heaps of fanservice and gore.