 If you liked
Sora no Otoshimono
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 ...then you might like
Arakawa Under the Bridge
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Both of these series are just some of the funniest things I have ever seen. Arakawa isn't quite as ecchi but it is just as funny. Arakawa doesn't have quite as many girls and isn't a harem type but all the characters have eccentric personalities which will end up making you laugh and love.