Jak was a male individual who lived with his father, Rorak, on the planet Coruscant during the Galactic Civil War. His father raised him to believe that, one day, the Galactic Empire would fall and the galaxy would be a better place. Jak was present in Monument Plaza with his father when Coruscanti citizens toppled a statue of the Emperor, Darth Sidious, and Imperial forces rushed in to maintain order. Jak was confused, believing that the war had come to an end, but Rorak told him that the real battle had only just begun. During the Coruscant civil war, Jak joined a group of rebellious youngsters known as the Anklebiter Brigade.