A big twist in The Rise of Skywalker reveals Rey is a Palpatine, which — if done in The Last Jedi - would have greatly changed Star Wars' Episode IX. The sequel trilogy is regarded by many as being rather disorganized, as it lacks direction for its characters, resulting in somewhat clunky storylines. Rey's story arc is no exception, which is disappointing considering how much promise was built up for her character in The Force Awakens. While The Last Jedi set Rey up as someone coming from nothing, Rey's lightning hands in The Rise of Skywalker blowing up a First Order transport begin the reveal that she's actually related to the most powerful Sith Lord, Emperor Palpatine. This said, the lightning twist alone doesn't fully reveal this detail, as Kylo Ren couldn't use force lightning because the power is a highly advanced dark side technique not unique to the Palpatine lineage. Therefore, only when Ren explicitly tells Rey that she's a Palpatine later in The Rise of Skywalker does the twist become fully revealed.
The Rise of Skywalker continues Rey's struggles between the light and dark side of the force. Revealing her to be part of the Palpatine bloodline attempts to accentuate this struggle, showing that the dark side is innately within her. While The Last Jedi admirably tries avoiding the Force-by-prestigious-bloodline approach, The Rise of Skywalker slaps this idea away by insisting that Rey needs to come from someone in the Star Wars franchise.
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While Star Wars' sequel trilogy is contentiously received by audiences, Rey being a Palpatine is a good concept that could have been executed much better had there been proper planning for the
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