Jax Pavan was one of the 582,797,754 Human males named Jax Pavan on Coruscant. He was a political prisoner deep inside the Emperor Palpatine Completely Rehabilitative Subterranean Penitentiary (EmPalComReSubPen). Coincidentally enough, his prisoner number was #24601.
He had a booming voice and narrated his inner monologue in an annoying half-talking, half-singing verse. When left to his own devices, he often sang "Who am I?" to himself for hours.