Star Wars: Every Sith Who Turned To The Light Side

Darth Vader is not a big fan of the Sith rule - "Always two there are, a master and apprentice" considering he has trained multiple pupils in the ways of the Dark Side. One of Vader's apprentices was a young Stormtrooper named Flint (which is a pretty unintimidating name for a Sith). Flint was supposed to serve as his master's second-in-command but after the Empire was destroyed, he became the Shadow Hand of Vader's other pupil, Lumiya.

Under the impression his master was murdered by Luke Skywalker, Flint vowed to destroy the young Jedi. After tracking Luke down on Naldar, Flint fought him and emerged victorious. But when he realised Luke did not kill Vader, Flint spared his life. Finding new purpose, Flint spent the remainder of his life helping people who had lost their homes in the aftermath of the Empire's Civil War. Sadly, Lumiya managed to track Flint down and kill him.