The Mostlaa were a humanoid, sapient species native to the Outer Rim planet Laressi. Individuals of the species had heavy brows, sunken eyes, and large, pointed ears. The Mostlaa named Jimmer had a receding hairline and a beard, creating an overall weasel-like impression. Jimmer stood 1.3 meters tall and wore a hooded, long-sleeved robe, a wrap around the waist, and boots. Jimmer worked as an executive assistant for Nilya Fek'ra, a crime lord based on the Outer Rim Territories' planet Cotellier during the period of the Galactic Empire.