 If you liked
Suzumiya Haruhi no Yuuutsu
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 ...then you might like
Super GALS! Kotobuki Ran
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At the risk of stretching things, the Super Gals characters share a couple of similar traits with the Haruhi characters:
Ran Kotobuki - Haruhi Suzumiya (forceful personality)
Miyu Yamazaki - Yuki Nagato (ready for action)
Aya Hoshino - Mikuru Asahina (sensitive)
Rei Otohata - Kyon (jaded sort)
Yuya Asou - Itsuki Koizumi (easy going type most of the time)