GX-99 functioned as the security droid for Cragus 12, demonstrating unwavering loyalty to him. While possessing the standard capabilities and software of droids from its series, it underwent significant alterations and improvements to amplify its performance.
GX-99's primary responsibility was the protection of the Claw, a task it executed effectively due to its near-constant presence on the ship. Equipped with piloting software, GX-99 was capable of navigating the ship to Cragus's position whenever Cragus 12 encountered difficulties. During these situations, GX-99 would operate the quad laser cannon manually against adversaries, allowing Cragus 12 to utilize his jetpack to get onboard.
Much like Cragus 12, GX-99 was a fugitive sought by the New Republic on charges of murder and aiding and abetting known offenders.
- " Wanted by Cracken " — Star Wars Adventure Journal 1 (Initial appearance)
- Cynabar's Fantastic Technology: Droids (Visual depiction only)