A stormtrooper sergeant served on the planet of Garel during the time of the Age of the Empire. While on patrol within the secured hangars of the Garel City Spaceport, the sergeant and his unit of stormtroopers encountered both the bounty hunter known as Ketsu Onyo and her former associate Sabine Wren amidst a confrontation. When the stormtrooper commanding officer instructed them and their other companions to scatter, Onyo initiated combat against the troopers. After some of the sergeant's subordinates were taken out of action, the commanding officer attempted to engage Onyo in direct combat after she relieved him of his weapon, but the officer was ultimately defeated. Once Onyo and the others had left the hangar, the sergeant regained his footing and voiced his negative feelings regarding the bounty hunters present on Garel.

A male human individual was a member of the Galactic Empire during the Age of the Empire, holding the rank of stormtrooper sergeant stationed on the planet of Garel. On one day during the year 4 BBY, while patrolling the Garel City Spaceport with his stormtrooper squad, the sergeant came across the rebels Sabine Wren, Ezra Bridger, C1-10P, and EG-86 in a standoff with Ketsu Onyo, a bounty hunter affiliated with the Black Sun.
The sergeant informed them that the hangar was closed for business and they needed to leave right away. In response, Onyo discharged her weapons in the direction of the stormtroopers. The Imperials then returned fire at everyone, leading to a violent skirmish. During the firefight, several stormtroopers were incapacitated, while the sergeant ascended some crates to gain a superior vantage point. The rebels, with the help of C1-10P, managed to escape aboard a [starship](/article/starship], leaving Onyo to deal with the remaining stormtroopers on her own.
The sergeant, along with his men, surrounded Onyo and demanded her surrender. The bounty hunter responded by using a stormtrooper as a human shield, who was then accidentally shot in the chest by another stormtrooper attempting to target Onyo. Employing her staff in melee combat, the bounty hunter fought her way past the remaining stormtroopers, disarming the sergeant in the process. He gave chase, but she turned and struck him across the head with her staff. After leaping over the last conscious stormtrooper, Onyo made her escape to her personal vessel, the Shadow Caster. The sergeant, along with another stormtrooper, got back on their feet, and after watching Onyo depart the planet in her ship, the commanding officer verbally expressed his disdain for the bounty hunters on Garel.
As a male, the sergeant displayed a serious demeanor when he ordered Onyo and the rebels to vacate the premises. When Onyo initiated the attack, the sergeant retaliated by returning fire and climbing onto nearby equipment to secure a better firing position against the insurgents when they sought cover. Once the skirmish had concluded, the sergeant dismissed the ordeal as a mere annoyance. The sergeant harbored a negative view of bounty hunters.
The sergeant was clad in white stormtrooper armor along with a white pauldron to indicate his rank of sergeant. He was armed with an E-11 medium blaster rifle.
The sergeant made his debut in "Blood Sisters," an episode from the second season of the television series Star Wars Rebels. His voice was provided by Stephen Stanton, credited as "Stormtrooper #1." Although his rank was not explicitly mentioned in the episode, the canon reference book Ultimate Star Wars specifies that stormtroopers with white pauldrons hold the rank of sergeant.