Jonsey was a male Human who served as a stormtrooper in the Imperial Navy during the Galactic Civil War.
In 1 BBY, he was assigned to the stormtrooper contingent aboard the Imperial I-class Star Destroyer Imperator. He was a member of the platoon that had been assigned to Cadet Leader Kyle Katarn for Katarn's Omega Exercise.
He participated in the ensuing battle on AX-456 and when the platoon made it to the comm room, Hong ordered him to pull the memory modules from the transmitters before leaving the base.
Jonsey and the others retreated to the base's cafeteria, where Rebel reinforcements killed all but six stormtroopers.
- The Complete Star Wars Encyclopedia