Revan (Earth-2042)

"Savior, conqueror, hero, villain. You are all things, Revan... and yet you are nothing. In the end, you belong to neither the light nor the darkness. You will forever stand alone."

- Darth Malak

Revan—renowned as the Revanchist, reviled as Revan the Butcher, worshiped as the Revan, dreaded as the Dark Lord of the Sith Darth Revan, and praised as the Prodigal Knight—was a male Force-sensitive Human who played pivotal roles as both Jedi and later Sith in the Mandalorian Wars, Jedi Civil War, and Great Galactic War. Having served the Jedi Order in the last years of the Mandalorian Wars, Revan, alongside his friend Malak, grew unsatisfied with the Order's lack of action and formed the Revanchists, before defecting to become a Dark Lord of the Sith and creating the Brotherhood of Darkness within the reorganized Sith Empire, earning him the nickname of the "Dark One". Ruling the Sith for three decades, Revan's reign was turbulent as the Brotherhood was rife with civil unrest, and conflict with the Jedi saw his numbers dwindle. A few Sith were starting to question his beliefs, including Darth Bane.

Source

 * https://starwars.fandom.com/wiki/Revan/Legends