May the Force be with you, Ben Solo... Ben Skywalker.
—Rey's last words to Ben Solo
Ben Solo was a human male Jedi who returned to the light side of the Force after renouncing the ways of the dark side. His alter ego, Kylo Ren, was the master of the Knights of Ren and Supreme Leader of the First Order. A product of Jedi and Sith teachings, Ren embodied the conflict between the dark side and the light, making the young Force warrior dangerously unstable. Yet it was through discord that he derived power, and he learned to channel his anger into strength. Inspired by the legacy of his grandfather, the Sith Lord Darth Vader, Ren sought to destroy the last remnants of the Jedi Order and conquer the galaxy.
The heir to the Skywalker bloodline, Solo possessed raw strength in the Force and had the potential for limitless power. He was born at the end of the Galactic Civil War in 5 ABY, when the Galactic Empire surrendered to the New Republic. His parents, General Han Solo and Princess Leia Organa, were considered great heroes of the Alliance to Restore the Republic. During the New Republic Era, Solo became part of a new generation of Jedi apprentices trained by his uncle, Jedi Master Luke Skywalker. However, Solo was seduced by the dark side through the machinations of the phantom Sith Lord Darth Sidious and his creation, Supreme Leader Snoke. He destroyed his master's training temple and killed his fellow students, and due to these actions he gained the moniker "Jedi Killer" along with his new identity as Kylo Ren.
Determined to sever all ties to his past, Ren killed his father, assassinated his dark master, and conquered vast regions of the galaxy as the new Supreme Leader. It was not a complete victory for him, however, as Rey, a Jedi apprentice whom he was growing close to, rejected his offer to rule beside him. Though they were sworn enemies, Ren and Rey shared a unique bond with each other, making them part of a dyad in the Force. In the last days of the war between the First Order and the Resistance, Darth Sidious offered Ren command of a powerful fleet, the Final Order, in return for killing Rey, his granddaughter, and ending the Jedi forever. Despite Ren's aspiration to rule the galaxy as the new Galactic Emperor and Dark Lord of the Sith, he was gradually pulled back to the light by his connection with Rey and the love of his parents. Reclaiming his identity as Ben Solo, the redeemed Jedi fought side-by-side with Rey against Darth Sidious at the at the Battle of Exegol in 35 ABY. During the battle, Rey was mortally wounded and Ben, aided by the spirits of the Jedi, finally vanquished the dark lord forever. Ben and Rey embraced and shared a kiss as Rey peacefully vanished in Ben's arms, leaving Ben to mourn her death.
After the final battle, Ben returned to the planet where Luke Skywalker's Jedi academy once was, seeking to become the man he once was and find peace within himself with guidance from the force spirits of his uncle and grandfather. A short period of time later, Ben, now having found peace and tranquillity, sets out across the galaxy to make amends for his past crimes and continue his family bloodline as the last Skywalker.