
It's...possible? But you're also looking at what is native to the land. I mean generally the reason we don't all ride horses in Eorzea is because they're not native to the continent and vise versa with Othard, in fact to these respective cultures such mounts are really a foreign concept, Griffins tend to be native to Ala Mhigo in general and from what little we've been able to see developed for specifically that region. I usually go by a rule of thumb if you have to do a lot of additional world building to explain your character it's going to be harder to get others to go along with it because very few people are going to accept an info dump for why your character makes sense.
-You're creating an entirely new tribe.
-An isolated Tribe is aware of and trains Griffons
-These Griffon-riding Au Ra were also aware and concerned about the political and revolutionary plight of Ala Mhigans in another continent and risked flying through Garlean airspace to reach Eorzea but could not be bothered to help out their neighboring Doma.
-Or these Au Ra were always in Eorzea and somehow immigrated from Doma hundreds of years ago and went somewhat un-noticed in the space of time where Garleans were crushing any resistance.
You need to also understand that the Autumn War (the time a hundred years ago when Ala Mhigo chose to outright invade the shroud) is a thing and there's still animosity today between Gridanians and Ala Mhigans, so much that Mhigan refugees were not actually allowed to settle in Gridania because the elementals were still pissed off about it.
Now I'm not saying there is not a possible way for you to work this, I think though you might be served better taking a low impact approach with your idea.
You say you want your Au Ra Raen to be a Griffin rider? Well we're assuming most of the Griffin riders were decimated when the Garleans took over but maybe they're looking to rebuild, maybe your Raen has that sort of gumption to stand up and insist she learn how to ride griffins so here's some options.
-She came across a wounded/abandoned griffin and befriended it.
-She heard tales of Griffin riders of old and took it upon herself to try to rebuild the ranks.
-She fought her way in for a spot among new recruits.
-She was assigned to become a griffin rider as some sort of Grand Company Ala Mhigo initiative and her unit is a new experimental group of Griffin Riders being tested out as an add on to normal operations.
As a disclaimer, you're free to rp however you wish, there's actually no restriction. I only want to give you these suggestions as a better workaround for what you want and what might create some interesting rp opportunities for your character in the world as this may encourage more people to play off the idea?
-You're creating an entirely new tribe.
-An isolated Tribe is aware of and trains Griffons
-These Griffon-riding Au Ra were also aware and concerned about the political and revolutionary plight of Ala Mhigans in another continent and risked flying through Garlean airspace to reach Eorzea but could not be bothered to help out their neighboring Doma.
-Or these Au Ra were always in Eorzea and somehow immigrated from Doma hundreds of years ago and went somewhat un-noticed in the space of time where Garleans were crushing any resistance.
You need to also understand that the Autumn War (the time a hundred years ago when Ala Mhigo chose to outright invade the shroud) is a thing and there's still animosity today between Gridanians and Ala Mhigans, so much that Mhigan refugees were not actually allowed to settle in Gridania because the elementals were still pissed off about it.
Now I'm not saying there is not a possible way for you to work this, I think though you might be served better taking a low impact approach with your idea.
You say you want your Au Ra Raen to be a Griffin rider? Well we're assuming most of the Griffin riders were decimated when the Garleans took over but maybe they're looking to rebuild, maybe your Raen has that sort of gumption to stand up and insist she learn how to ride griffins so here's some options.
-She came across a wounded/abandoned griffin and befriended it.
-She heard tales of Griffin riders of old and took it upon herself to try to rebuild the ranks.
-She fought her way in for a spot among new recruits.
-She was assigned to become a griffin rider as some sort of Grand Company Ala Mhigo initiative and her unit is a new experimental group of Griffin Riders being tested out as an add on to normal operations.
As a disclaimer, you're free to rp however you wish, there's actually no restriction. I only want to give you these suggestions as a better workaround for what you want and what might create some interesting rp opportunities for your character in the world as this may encourage more people to play off the idea?