"loyal servant, guard, and/or (in honor of the recently developing insanity) support animal"
Rocket Raccoon for the win
Funny thing, Rocket's *comic* back story is basically all of those, by way of Halfworld. His MCU version appears to be a lot simpler in that regard, though we've only heard hints of his early life.
The current take on the OTU, glimpsed in Agent and strongly implied in the pages of T5.X is that there are native alien races all over. The Majors are well documented, while the Minors fall into roughly three categories.
-Mold Breakers: those that challenge the Vilani definition of Minor Race. The Aslan do so successfully and are considered a Major, while the Suerrat were beaten down politically and wear the Minor label grudgingly despite being some 60% of the population of Ilelish Sector. In case you haven't looked at the total population of Ilelish, that's a LOT of Suerrat.
-"Standard" Minor Race: possess jump in many cases but didn't develop it themselves; less that 10% of the members of these races are more than 10 parsecs from home. Nearly all documented Minor Races fit here
-Shut-Ins: less than 1% of these populations would even consider leaving home, and most of them never do; found only on their own world, whether due to inclination or some physiological barrier to travel. These are frequently NOT documented even in developed sectors. The Crawni (Craw/Spinward Marches) and the Denuli Shriekers are perhaps the best known in print.
The second and third groups are huge, and act to allow you, the Player and/or Referee, to play just about anything you like.
As a quick and dirty solution I'd use Aslan stats for the Badders (higher Strength and Endurance, lower Dexterity, natural claws), sketch in a social structure that gives the player something to build on, and let the rest write itself. Homeworld would ideally be either in or near the campaign zone.