If you liked
Ouran Koukou Host Club
|
...then you might like
Love Stage!!
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For starters both MC cross dress though while Izumi is a guy Haruhi is a girl. Rei and Kyouya have the same characters and so do Tamaki and Shougo. They are both comedies and both have to do with the lives of the rich in a way since in Ouran they deal with kids if millionaires in Love Stage the main character is a son of a show business family. But yeah they both are romcoms that will put a smile on your face.
If you liked
Zero no Tsukaima
|
...then you might like
Seireitsukai no Blade Dance
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Basically they both have the familiar thing going on. Both of FMC have similar personalities and treatment of their familiars. What's also similar is the harem thing going on with the FMC being rather possessive. Both of FMC are of some sort of nobility (though one is a fallen noble) and yes they are both happening in some fantasy world. So yeah if you liked Zero no Tsukaima you're likely to like Seirei Tsukai no Blade Dance.