Gimm, a male of the human species, served as a lieutenant and TIE fighter pilot within the Imperial Navy. He was under the command of Thrawn, also known as Mitth'raw'nuruodo, and fought for the Galactic Empire. His involvement included participation in the Cyphar Incident. Subsequently, Eli Vanto discovered that Gimm was among those who engaged in an assault against Thrawn at the Royal Imperial Academy.