A great example is in the Lorenverse (Okay, technically more accurate to say Aravorn, but Loren is cuter
For that matter, I also like how you hint at societal tensions in other areas. While the Empire is nominally run by the wizards, one can also see that the military really doesn't get along with them. I imagine they may also be a check on each other's power.
Even small touches in other games are done well. If one plays Spirited Hearts, and plays as an elf on the Thyme path, you find out that in elvish tradition, one may duel another for another's hand in marriage...and the contest doesn't have to be in a melee fashion.
