Another plot could be Darth Vader traveling to the future. He could be shocked by the state of the galaxy and then try to use his knowledge of the past and his power to either save or dominate it. He may encounter new enemies or new forms of the Force.
Perhaps a plot where Darth Vader time travels and ends up in an alternate timeline. He could find himself in a world where the Jedi are still in power, and he has to decide whether to continue his Sith ways or try to find redemption in this new reality.
One interesting plot could be Darth Vader traveling back in time to prevent his own fall to the dark side. He might try to change the events that led him to become a Sith, like saving Padmé.
One interesting plot could be Darth Vader traveling back in time to prevent his own fall to the dark side. He might try to change the events that led him to become Vader, like saving Padmé. Another could be Vader traveling to the future and seeing the downfall of the Sith, which makes him question his loyalty to the dark side. He could then try to find a way to change the future of the Sith order.
One interesting plot could be Darth Vader snapping and deciding to take on the entire Jedi Council by himself in a show of ultimate power. He might use his dark side abilities in ways not seen before, like bending the very fabric of the Force to his will.
Enemies could be many. In the past, he might face Sith Lords who don't want him to change the timeline and disrupt their plans. In the future, he could encounter new galactic powers or beings with strange powers that oppose his presence. For example, a future race that has developed technology to counter the Force.
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.
Perhaps they time travel to a parallel universe. In this universe, Darth Vader never turned to the dark side and Anakin Skywalker remained a Jedi. Luke would be able to see how different things could have been. This experience might inspire Vader in their own universe to try and find a way back to the light side, and they could then work together to bring positive change to their own timeline.
One idea could be a fanfic where Darth Vader has a secret apprentice who is an original character. This OC could be a young Force - sensitive being from a hidden planet. The story could revolve around Vader training this apprentice in the ways of the Dark Side, while also facing internal conflict as he sees some of his own past self in this young OC.
One interesting storyline could be Darth Vader's secret influence during the Clone Wars. Maybe he was subtly manipulating events from the shadows, which would add a whole new layer of intrigue to the Clone Wars narrative.
One plot idea could be a time - travel scenario where Ahsoka is sent back in time and has to face Darth Vader before he fully became the Sith Lord she knew. She could try to prevent his fall. Another idea is a story set in an alternate universe where Ahsoka and Vader team up against a greater threat, forcing them to put aside their differences. Maybe a plot where Ahsoka is captured by Vader and he has an internal struggle about what to do with her, given their past relationship.
Some Darth Vader fan fictions are set in alternate universes. For example, there could be one where he never got injured on Mustafar and instead became an even more powerful Sith. There are also those that delve into his life as a Sith Lord in more detail, like his interactions with other Sith or his influence on the Empire. Additionally, fan fictions might feature Darth Vader training a new apprentice, exploring how he would pass on his knowledge and skills.
Well, you could have a fanfic where Darth Vader travels back in time to the Clone Wars era. He could try to change certain events to better suit his later goals as a Sith. For example, he might attempt to influence the development of the clone army in a way that would make them more loyal to him personally rather than the Jedi or the Republic. This could lead to all sorts of conflicts and power struggles within the already complex Clone Wars setting.