Earll, a human female, was an officer within the Galactic Empire's military. By the fifteenth year of the Age of the Empire, she had achieved the position of commander. It was during this period that Earll received a distress signal originating from Nadea Tural, a member of the Imperial Senate; however, it was discovered that the senator had already been saved by insurgents resisting the Empire, who were based on Lothal. Accompanied by a unit of stormtroopers, Earll gained access to the rebels' vessel, the Ghost, and gave the order for the crew's summary execution. Senator Tural, advocating for due process for the rebels, intervened as Earll's troopers prepared to open fire, which gave the Spectres an advantage. Hera Syndulla, the Ghost's captain, shot and stunned the Imperial commander.
Earll was a woman of considerable height and slender build, characterized by her pale, sallow complexion, piercing ice-blue eyes, and cropped black hair. Displaying a ruthless and callous nature, she demonstrated a willingness to execute the Ghost's crew despite Senator Tural's objections. She seemed more skilled compared to most Imperials the Ghost crew faced, personally overpowering Sabine Wren and Ezra Bridger, while her squad managed to capture the remaining members. Although she successfully apprehended them, she ultimately failed to carry out their executions.