lol im thinking of black and white knight (or black and white mage ffstyle) fighting on top on chocobos.
Maybe there could be a quest that has the 3 different major nations and there special chocobos and there could be some event over them, which lead the the opening of chocobos for everyone to ride.

The current 3 big nations need some identy , which is missing or lacking in my view atm , this could be perfect way to do it.