All the races we have now are very human-like, so I'd prefer to see something a little less humanoid than what we already have, without delving into "furry" territory. I'd be cool with being able to play as one of the in-game beastmen races (goblin, Qiqirn, Amal'jaa, Kobold, Ixali) or maybe some of the FF Tactics races (Viera, Bangaa, Nu Mou, moogles). I'd figure the in-game beastmen races would probably be easier to implement. Then, you could possibly have beastmen cities where said characters could start out in (possibly something along the lines of Natalan, U'Ghamoro, and Za'harak aesthetically, but designed without aggressive mobs and more city-like), and add in some storyline elements that show more of the beastmen's perspective in the Eorzea vs. Garlemald conflict and how they learned to summon primals.