Almost nothing is known of Xelaya. According to Lieutenant Alara Kitan, the gravitational pull is many times "the planetary average," which gives Xelayans super-human strength in Earth-like environments.
Xelayans tend to be peace-loving: they regard the military as an unfortunate necessity and Humans as brutish. Therefore, despite their tremendous physical gifts, few Xelayans join the military.
Alara Kitan has a framed picture of Xelaya above her desk, likely as a reminder of her homeworld.