 If you liked
Penguin Musume♥Heart
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 ...then you might like
Shinryaku! Ika Musume
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Its really similar, since they have the "Musume" word in the name too.. But the randomness and the characters are pretty similar also. Tho it dosen't have the ecchi of Penguin Musume, Ika Musume is surprisingly good and fun to watch. And also, it has many weird characters xD.