In such a fanfiction, Darth Vader might try to prevent his fall to the dark side. He could use his knowledge of the future to avoid the events that led him to become a Sith. For example, he might prevent the death of his mother or his duel with Obi - Wan on Mustafar.
Darth Vader could meet advanced droids that have personalities and abilities far beyond what he's used to. These droids might see him as a relic from a bygone era. He could also meet future scientists who are intrigued by his cybernetic enhancements and try to study him. Additionally, there's a chance he meets descendants of his former allies or enemies, which would create a complex web of relationships and interactions.
His presence could change the power balance. If he sides with the Jedi, the Sith would be at a disadvantage. The Sith rely on secrecy and manipulation, but with Darth Vader knowing their plans, they would be exposed more easily.
Well, in a 'Darth Vader goes back to the Clone Wars' fanfiction, he might seek to alter the relationships within the Jedi Order. He could try to influence Anakin Skywalker (his former self) in a different way. For example, he could try to expose the Sith plot earlier, which would completely change the dynamics of the Clone Wars. He might also try to use his advanced combat skills and knowledge of the dark side to turn the tide of certain battles in a different direction than what originally happened.
In this fanfiction, Darth Vader could end up in a future where the Sith no longer exist. He might be forced to re - evaluate his beliefs. He could encounter new forms of combat and find his lightsaber skills not as effective as they once were. He may also face a future society that has different values and moral codes, which could lead to some interesting conflicts and character development.
In such a fanfiction, Darth Vader could change the course of history. He might prevent the rise of the Empire or alter his own fall to the dark side. For example, he could warn Anakin Skywalker about Palpatine's true intentions, thus changing the entire Star Wars timeline.
He might try to change his own fate. For example, he could prevent himself from turning to the dark side in the first place. Maybe he would warn his younger self about Palpatine's true intentions.
He could meet his younger self, Anakin Skywalker. That would be a really interesting encounter. He might also meet Qui - Gon Jinn, who could sense the conflict within him. And there's a chance he'd cross paths with Yoda in his prime, which would lead to some intense confrontations or perhaps even unexpected alliances.
He might be shocked by the advanced technology. The Empire's weaponry would seem primitive compared to future tech. He could also be intrigued by the new forms of the Force if they had evolved.
Darth Vader was originally Anakin Skywalker. He was a slave on Tatooine. Qui - Gon Jinn discovered his strong connection to the Force and took him for Jedi training. Anakin had great potential but was haunted by fear, especially of losing his loved ones. His relationship with Padmé Amidala led to his downfall. He turned to the dark side under the influence of Palpatine, who promised him the power to save Padmé. After a fierce battle with Obi - Wan Kenobi, he was severely injured and transformed into Darth Vader, becoming a powerful enforcer for the Galactic Empire.