Admiral Massad Thrumble was an Imperial droid researcher, working under Simonelle, who succeeded in creating fully operational Human replica droids for numerous clients including Black Sun and the Empire. Some of the HRDs he created included Guri, as well as replicas of Frija Torlock and her father Lexhannen.
Thrumble owned and operated a small cantina on Hurd's Moon after the Battle of Endor. He performed neural restructuring on Guri after she had sought him out. This removed her criminal programming but left her martial skills intact.
- Agent of the Empire—Iron Eclipse, Part 2 (Mentioned only)
- Shadows of the Empire: Evolution (First appearance)
- "Or Die Trying"—Star Wars Insider 75 (Mentioned only)
- The Essential Guide to Droids
- A Guide to the Star Wars Universe, Third Edition
- The New Essential Guide to Droids
- The Official Star Wars Fact File 85 (REP2, Human Replica and Synthdroid)
- The Complete Star Wars Encyclopedia