Star Wars: Every Sith Who Turned To The Light Side
2. Kylo Ren / Ben Solo
After The Galactic Empire was destroyed, Luke Skywalker trained several younglings in the ways of the Force, including Han and Leia's son, Ben Solo. After The First Order's Supreme Leader, Snoke, poisoned Ben's mind, he killed Luke's students and became Snoke's apprentice, Kylo Ren. When Han tried to convince him to walk away from the Dark Side, Kylo slew his father.
But after he discovered Snoke was simply a clone of The Emperor, who had been manipulating him for his own agenda, it was the first time Kylo felt that he might be on the wrong side of the war. When he had a vision of his father, Kylo was inspired to reclaim his identity as Ben Solo and help Rey destroy Darth Sidious.
Although she killed The Emperor, the effort cost Rey her life. Desperate to redeem himself, Kylo gave his own life-force to revive Rey. After embracing each other for a moment, Kylo passed away and became one with the Force.