Well, he could have a huge impact on the events of the past. He might use his knowledge of the future to gain an advantage. Say, he could help the Jedi defeat the Sith earlier if he chose to side with them, which would completely change the course of the Star Wars universe as we know it.
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.
If Darth Vader goes to the past in fanfiction, it's possible that he would try to find a way to save Padmé. He might think that by going back in time, he could change the events that led to her death. He could also try to use his power and influence to bring about a different future for the galaxy, one where there is more peace and less destruction.
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.
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 a 'Ahsoka meets Darth Vader' fanfiction, there could be an intense battle. Ahsoka, with her Jedi skills, would be a formidable opponent to Vader. Maybe she tries to redeem him, recalling the Anakin she once knew. Or perhaps Vader sees her as a threat to the Empire and attempts to eliminate her quickly.
Well, one possibility is that Ahsoka tries to redeem Vader. She might see a glimmer of Anakin still in him and strive to bring him back to the light side. It would be a very emotional encounter, full of memories of their past as master and apprentice.
Well, in fanfiction, when Darth Vader meets Yoda, it could lead to a battle of ideologies. Vader, having turned to the dark side, represents power and control through the Sith ways. Yoda stands for the Jedi's connection with the Force in a more harmonious and selfless way. They could engage in a Force - powered duel where Vader tries to overpower Yoda with his dark side strength, but Yoda uses his wisdom and experience to counter.
Well, it could be a really wild story. Harry's magic might interact in strange ways with Darth Vader's Force powers. Maybe Harry would try to use his spells to resist Vader's dark side influence.
He might be interrogated by the captors. They could try to extract information about the Sith, the Empire's secrets, or his own powers. Maybe they would attempt to turn him against the Emperor, using various means like appealing to his remaining humanity or threatening him with things he values.
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.
Well, in such a fanfiction, R2D2 could use his beeps and whistles to communicate something unexpected to Darth Vader. It could be some long - forgotten information about Anakin Skywalker that makes Vader question his path. And Vader might find himself hesitating to harm the little droid because of this new - found knowledge.
Well, if Darth Vader looks for Luke in Tatooine in fanfiction, it could be a really intense story. He might sense Luke's presence through the Force, but the Force can be tricky on Tatooine with all the sand and strange energy fields. He could end up in a wild goose chase, following false leads. And who knows, he might even have to deal with some of the local criminal elements who don't take kindly to a Sith Lord stomping around their territory.