Zero no Tsukaima, Romeo x Juliet Recommendations
-Both are in very similar fantasy settings
-Centers around a romance that is controversial in some way (RxJ: From enemy families / ZnT: From entirely different Worlds)
-The "main pairings" of each have someone of wealth/royalty, and someone of lesser status
-Each have fairly large supporting casts
The main difference between these two is the "ecchi" tag on in Zero no Tsukaima.