Imarrra was a female Wookiee who lived her life during the era of the Galactic Civil War. As an expert in the wilderness survival techniques of Kashyyyk, she served as an informant for Queen Kylantha of Naboo.
In 1.5 years ABY, Kylantha requested that Imarrra, alongside her companions Drrlirm and Orrekazzapirr, journey to their native world of Kashyyyk. Their mission was to investigate reports indicating that the Imperial forces stationed there were aiding Trandoshan slavers. Upon arriving on Kashyyyk, Imarrra and her fellow travelers attempted an investigation of the Trandoshans' slaving activities at a camp located near Kachirho. However, they were ambushed and quickly overwhelmed. Imarra and Orrekazzapirr were taken prisoner and transported to the slaver camp. Shortly thereafter, the Trandoshans sold them to the Empire, who then transferred them to their prison facility on Dathomir. The Empire desired to keep their involvement in the Trandoshans' slaving operations on Kashyyyk a secret.
Fortunately for Imarra and Orrekazzapirr, Queen Kylantha became concerned when she received no communication from them. Consequently, she hired an experienced adventurer to conduct an investigation. This adventurer located the injured Drrlirm in the jungles and eventually uncovered the truth about their imprisonment on Dathomir. After successfully navigating the Imperial blockade surrounding the planet and landing, the spacer managed to infiltrate the prison facility and facilitate the escape of Imarra and Orrekazzapirr. Imarra was aware of the location of an old Alliance hideout on the planet, where an old ship was stored. The two Wookiees successfully reached the hangar and utilized the antiquated ARC-170 starfighter to depart from the planet. With Imarra piloting and Orrekazzapirr manning the gunner's seat, they rendezvoused with the spacer's starship. Together, they breached the Imperial blockade and fled to Naboo.
Imarrra functioned as a Non-Player Character (NPC) within Rage of the Wookiees, which was the second expansion pack for Star Wars Galaxies, the MMORPG developed by Sony Online Entertainment. The game was shut down on December 15, 2011. During the To the Queen's Aid quest, the player was tasked with traveling to Kashyyyk to locate the missing Wookiees. Ultimately, the player discovered that Imarra and Orrekazzapirr were being held captive on Dathomir and were required to meet them inside the prison. Subsequently, the player needed to escort them out of the prison, after which they separated. The subsequent phase of the mission unfolded in space above Dathomir and involved the destruction of multiple Imperial starfighters before the quest could be completed.