Image Credit: Lucasfilm via Bioware
Revan is one of few who has spent time in the light and dark side of the Force. He’s also one the most interesting characters in the Star Wars universe. Revan was accepted into the Jedi Order as a child, and although he had a few Jedi Masters, Kreia is believed to have been his first.
During the Mandalorian Wars, Revan became critical of the Jedi Order. After the Mandalorian Wars, Revan and his friend Malak went soul searching. They stumbled upon on what they believed to be the new Sith Empire. They found the Sith Emperor, but instead of fighting them, the Sith Emperor twisted their minds and made them into his servants.
After a while of being Darth Revan, parts of his mind were erased by the Jedi Order. Thus, turning him from the Dark Side. Revan was one of the most powerful beings in the Force. In one instance, while fighting Sith forces, Revan used the Force to grab a few big pieces of asteroids, and threw them at the Sith forces.