Ji'Ni Sil was a Jawa who made his home on Tatooine during the era of the Galactic Civil War. Following the Battle of Yavin, Sil took on the role of a trader, operating out of the Jawa Mountain Fortress. He utilized a protocol droid named C4-ZX as his translator. In the year 1 ABY, Ji'Ni Sil was approached by a spacer who sought a body casing from an R2 unit that had once been the property of Peggin Dulin and was later recovered by Jawas. Both Imperial Commander Barrezz and Rebel Captain Bastra were interested in obtaining this particular droid. Ji'Ni Sil told the spacer that the droid casing had been sold to a miner of robonium. Despite the miner's death at the hands of Tusken Raiders, the spacer eventually succeeded in finding and reclaiming the casing.
Ji'Ni Sil appeared as a non-player character within the 2003 video game Star Wars Galaxies. This massively multiplayer online roleplaying game was developed by Sony Online Entertainment and published by LucasArts. The game was shut down on December 15, 2011. Ji'Ni Sil's inclusion in the game was part of the "Legacy Quest" update, which was released with "Publish 25", also known as the "New Game Enhancements," on November 15, 2005.