In some fanfics, there might be a plotline where Palpatine tries to corrupt Anakin even further during the battle, using psychological warfare. Anakin, on the other hand, has to resist this while also fighting for his life. This adds a layer of psychological drama to the physical fight between them.
It really depends on how the author writes it. If the fanfic focuses on Anakin's potential and his growth beyond what we saw in the movies, he could win. For example, if he has fully mastered some new form of lightsaber combat or Force ability.
It really depends on how you write it. If it's Anakin at his peak before turning to the dark side, he has a lot of raw power and potential. But Vader has years of experience as a Sith Lord. So, it could go either way.
Luke Skywalker could be another key character. Since he is Vader's son, his presence could add an interesting dynamic. He might be the one who somehow triggers the battle between Anakin and Vader, or he could be in a position to influence the outcome of their fight, perhaps by appealing to the remaining good in Anakin or by facing off against Vader himself in a three - way struggle.
One idea could be a what - if scenario where Anakin in his pre - Vader state somehow gets a glimpse of his future as Vader. He could then fight against the dark side within himself that would turn him into Vader. Another could be a time - travel plot where Vader is sent back to face Anakin, and Anakin has to decide whether to accept his possible future or fight against it.
Well, Palpatine's background is filled with secrecy and deception. He was a master of political manipulation and used his Sith powers in the shadows to gain control. His early life was marked by his apprenticeship under Darth Plagueis and his plotting to overthrow the Republic.
A fan fiction could also explore a parallel universe where Anakin and Darth Vader are two separate entities that co - exist. They are forced to fight not because of Anakin's fall, but due to some external force that wants to see the two most powerful Sith - like beings battle it out. This could lead to an exploration of their different fighting styles and the power dynamics between them.
Maybe Palpatine sees Ezra as a potential tool or apprentice at first. He tries to manipulate Ezra into joining him. Ezra, on the other hand, is conflicted because he might see some good in Palpatine's grand plans for the galaxy, but eventually realizes the cost of following the dark side. Their relationship would be a complex dance of manipulation and resistance.
Maybe some of the Jedi Council members. They were the ones who were constantly in conflict with Palpatine's plans, so they could be in the story to show the power struggle between the Jedi and Palpatine.