Similar skeleton, sure. Modified to look more like Red XIII's species, absolutely. Doesn't need to be an exact copy of Red XIII. Ditch the shackles, the feathers in the hair, the braids, the markings, etc...
That'd be pretty awesome, but SE seems pretty firmly set against adding anymore pet classes/jobs to the game, last I heard. If you meant something more like, Red XIII (a lookalike) in place of your Chocobo, I could get behind that, but somehow, I doubt SE will let us do that.
