The heroic scavenger-turned-Jedi, Rey, was tempted by the dark side of the Force throughout the Star Wars sequel trilogy, which was made worse by her relation to the Sith Lord and Emperor, Sheev Palpatine. Palpatine was the ultimate villain of the Skywalker Saga, and Star Wars: The Rise of Skywalker retroactively established him to be the sinister intellect behind the First Order from the start, cementing him as the ultimate Star Wars villain.
Read more on screenrant.com