Done for a Star Wars tabletop starting up here in the next few days, all about a bunch of Jedi and their fall to the dark side. Ideally, we should have four falls from grace that are far more sane than Anakin's was.

Killix Tar'van was pretty much smooth-talked into abandoning his military unit to join the Jedi order. His master had lied to him about being able to get the whole thing cool with the government of K'shr, and later, on a mission that brought them near his homeworld again, he bumped into his old squad, who caught him and tattooed him with a Mark of Desertion (the black thing on his face). They were going to ship him back home for a prison term when he tapped into the Dark Side for the first time to kill them and get away. He's been on a slow but steady descent ever since.