Shin was a Duros individual, identified as male, who held the rank of major within the Alliance to Restore the Republic throughout the duration of the Galactic Civil War.
Throughout the Galactic Civil War, Shin and the soldiers under his command were involved in numerous battles and smaller engagements, often facing off against Imperial Colonel Brenna and the forces she commanded.
Not long after the Rebel Alliance achieved victory over the Empire at the Battle of Yavin, the Alliance was compelled to evacuate due to concerns about Imperial retaliation. As the evacuation neared completion, Imperial troops made landfall near their base located on the fourth Moon of Yavin. Shin and the troops under his command engaged in combat against the invading enemy forces as they launched an assault on the base, with the Empire's objective being the capture of the Rebel's data banks.
Subsequently, Shin became a member of an elite Rebel cell that conducted operations from Mos Eisley on Tatooine. Upon discovering their presence, the Empire launched an attack on the city while the Rebels attempted to safeguard a U-wing as it prepared for takeoff. As the battle commenced, Shin reminded his troops to exercise caution, emphasizing that they were fighting in a residential area, a consideration not shared by the enemy commander, Brenna, who had authorized civilian casualties.
Ultimately, Shin played a role in initiating an assault on the Imperial shipyards orbiting the Planet of Fondor. His forces directed their attack towards a docked Imperial II-class Star Destroyer, with the intention of destroying it.
Shin was present at Echo Base during the Empire's discovery and subsequent attack on the location. Following General Maximilian Veers's destruction of the base's power generators, Imperial troops launched assaults on both the east and west hangars. Shin and his troops engaged the advancing Imperials in combat as they attempted to sever the fuel lines, aiming to prevent the Rebel transports from taking off.
During the Battle of Endor, Shin found himself aboard a CR90 corvette that crashed into Command Center North on the second Death Star. He took charge of the surviving Rebel passengers, leading them in a skirmish against the Imperial forces present, with the goal of sabotaging the station's superlaser and escaping.
In the aftermath of the battle, an Imperial II-class Star Destroyer launched an attack on an MC80 Star Cruiser in orbit around Endor. Shin assumed command of the fighters that were deployed to defend the cruiser, with the ensuing battle unfolding amidst the debris of the recently destroyed Death Star II.
Sometime later, Shin spearheaded an assault on Research Station 9, an Imperial Tarkin Initiative facility situated on Endor's forest moon. As part of the assault, the Rebels targeted a small outpost located near the main facility, with the intention of acquiring an All Terrain Armored Transport for use in their advance on the primary facility.