Looma is always down for sparring partners, though her idea of sparring is more like "beating one another up in a friendly way."

But I am familiar with the canon and Shiro'D do better than most humans! The arm would even be safe to use against her, since her kind hits just as hard, if not harder o/

(she would be super bad at helping him relax though she is only barely out of her teenage years herself and is not much of an improvement over Keith and Lance whoops)