S4-C8-GE3, dating back to 3951 BBY, was a GE3-series protocol droid equipped with feminine programming. A peculiar trait defined her: a fixation on the game of pazaak. You could often find her at the Pazaak Den located adjacent to the Refugee Sector cantina on Nar Shaddaa. She was well-known because, despite her enthusiasm for pazaak, she lacked skill and frequently lost significant amounts of credits in bets.
S4 encountered Meetra Surik unexpectedly; Surik was attempting to lure out the notorious Champ. Surik grew wary of S4's supposed quirk, and discovered that the programming fault that supposedly drove S4 to the cantina to gamble was actually a skillfully concealed program designed to remotely gather confidential data. To advance her own objectives, Surik repaired the programming, causing S4 to lose all interest in pazaak.
Obsidian Entertainment's 2004 Star Wars: Knights of the Old Republic II: The Sith Lords video game featured S4-C8's initial and sole appearance.