Udo was a boy of average height and build, though he was easily the tallest and heaviest of the Warrior candidates, with shaggy black hair and dark eyes which he wore oval-shaped goggles over in place of glasses. Like his fellow Warrior candidates, he wore the standard Marleyan soldier uniform consisting of a light jacket and pants, supply packs on the hip, suspender straps, a hard hat with a stripe around it, and tall combat boots.