The Tarro were muscular humanoids from Tililix, a planet in the Til system deep in the Unknown Regions. Their skin color varied from light gray to dark green, while their eyes were bright yellow. Tarro hair colors varied with their sex, with males having dark blue or black hair while females had brown hair, sometimes tinged with red. Their seven-fingered hands had long curved claws, which they could use along with their sharp teeth in hand-to-hand combat. Many non-Tarro found their strength and natural weapons to be intimidating. Their faces were distinguished by their large foreheads and flat noses.