Gaff was a Kobok of the male persuasion who resided on Roon during the initial period of the Galactic Empire's reign. He served as the personal assistant to Governor Koong in the Tawntoom province. Possessing yellow skin, Gaff was a humanoid distinguished by his three orange compound eyes, with the third eye situated at the rear of his cranium.
Hailing from Roon, Gaff, a male Kobok, departed his homeworld with aspirations of achieving notoriety within the galaxy's criminal element. As with all members of his species, Gaff possessed stingers located on his arms that produced a strong poison capable of rendering humanoids unconscious, though Koboks themselves were also vulnerable to its effects. Over time, he refined his abilities as a bounty hunter, assassin, and spy. He was frequently seen wearing a Koboth Insurgent Mantle, though his actual involvement in the Mavvan Conflict, a brief war that involved his species and the Galactic Empire, remains uncertain. Gaff ultimately made his way back to Roon, where he formed an alliance with Governor Koong, a decision he later considered a low point in his professional life.
Koong embroiled Gaff in numerous schemes intended to gain favor with Admiral Terrinald Screed, none of which succeeded as planned. In the end, Koong, seeking retribution for Screed's betrayal, attempted to assassinate the Admiral and subsequently destroyed the Tawntoom Citadel, with Gaff still inside. Fortunately, the Kobok managed to survive the explosion.