Probably one of the most powerful in the Star Wars universe, and most certainly my favorite, is Darth Revan.
Anyone who played the original Knights of the Old Republic games will understand why I love Revan but I'll go into it more myself. Revan was a powerful Jedi in the Old Republic Era. Going against the will of the Jedi council, Revan fought in the Mandalorian Wars with the republic and lead the Republic to victory. Revan and his friend, Malak, rose through the ranks quickly, eventually gaining command over the entire republic navy. At the end of the war, Revan single handedly fought and defeated Mandalore, the leader of the Mandalorians, leading the war to it's end. Revan his Mandalore's mask in a tomb on Korriban and began passing with teachings to those who fought with him in the wars.
Revan and his apprentice, Malak, then started a war with the republic. The two declared themselves the new Sith lords, overthrew the sith emperor on Korriban and took the planet for their with academy. Nearly all the soldiers under their command in the Mandalorian Wars stayed loyal to Revan, not trusting the Jedi who sat and did nothing to help while their republic was falling. Revan and Malak started what would become known as the Jedi Civil War. Most civilians didn't know which side was which, as Revan and Malak were seen as heroes of the republic and the war was mostly fought between Revan and Malak's new Sith empire and the Jedi order. Those who were no longer loyal to the new Sith lords felt betrayed by the hero they fought side by side with in the Mandalorian Wars.
Revan and Malak had an advantage in this war that the Jedi order did not know about noe could they keep up with. The Star Forge. A space station that used the power of stars to creating near infinite numbers of droids and ships etc. that were needed to fight the republic. Revan and Malak almost defeated the Jedi and the republic, but Malak had laid a trap for his friend and master that he hoped would end up defeating both his master and a troublesome commander in the Jedi order, Bastilla Shan, a user of the battle meditation force technique that could boost morale and aid large armies through use of the force, helping them win battles normally thought impossible. Bastilla confronted Revan on his ship, and while they were fighting, Malak had his ship fire upon Revan's ship, resulting in near fatal injuries to Revan. Revan was brought back to the Jedi enclave on Dantooine and healed, then his mind was reprogrammed to make him think he was a loyal soldier of the republic under Bastilla's command.
Memories don't stay under wraps for too long, however. In Knights of the Old Republic, you play as Revan, slowing regaining your memories through the game. At some point all that happened is revealed to you and it's a rather cool moment. But there's a dark side ending and a light side ending. For this, I'll keep going into Revan's history with the dark side ending.
Eventually Revan gains his memories back and learns that Malak betrayed him. Bastilla ends up captured and then turned to the dark side, Malak's new apprentice. Revan and his new allies find their way to the Star forge to confront Malak, bring him down and reclaim his spot as Sith Lord. Gaining Bastilla as an ally, turning her against Malak as Revan's new apprentice, Revan takes Malak down and uses the Star forge to continue the war against the republic, with the aid of Bastilla's battle meditation.
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