 If you liked
Vandread
|
 ...then you might like
Kami nomi zo Shiru Sekai
|
Vandread is in space, but both involve aliens and a genki/air-head character. Vandread has that same harem type feel, and both have the saving the "world" plot.
Neither anime are a serious type; they're more of a laid back watch.
Each are relying on a guy who is perfect for getting the job done.
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