Gullstream was a crossbowman, with a high forehead with a prominent white blotch. He had almond-shaped eyes and was dark-skinned. According to Smiles, there was "something about Gullstream that made women take a second and third look". She also suspected that he had Tiste Andii blood.
Sergeant Thom Tissy's 12th Squad of the 8th Legion, 9th Company of the Bonehunters, composed of Gullstream, Corporal Tulip, Ramp, Jibb, Mudslinger and Bellig Harn, was one of the six squads under the command of Fist Keneb during the Bonehunters' invasion of the Letherii Empire.