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.
Anakin might betray Palpatine to save someone he loves. If Palpatine threatened Padmé in some way, Anakin would surely turn against him. After all, Anakin's love for Padmé is one of his strongest driving forces.
Another important aspect is the emotional turmoil of Anakin. A great fanfic will show his struggle between the light and the dark side. He loves Padmé and his friends in the Jedi Order, but at the same time, he is drawn to Palpatine's offers of greater power to protect them. It's like a constant battle within him, and a good fanfic will explore this in depth. In some fanfics, Anakin's dreams about Padmé's death are a central part of his emotional turmoil and his journey towards the dark side.
Yes, there are some great Anakin kills Palpatine fanfics. You can try searching on fanfic platforms like Archive of Our Own. Some fanfics might explore different motives for Anakin to kill Palpatine, like a sudden realization of Palpatine's true evil nature before it's too late in the timeline. Others could be set in alternate universes where Anakin has a different backstory or set of circumstances that lead him to take this action.
One possible plot could be that Anakin discovers Palpatine's plan to destroy the remaining Jedi earlier than in the original story. This early discovery gives him the chance to turn against Palpatine and kill him to save the Jedi order. Maybe he finds some hidden evidence that convinces him once and for all of Palpatine's true intentions.
The storyline would take a huge turn. Instead of the Empire rising as it did in the original, there could be a new era of peace. The Jedi Order might be restored more quickly, and Anakin could become a hero instead of Darth Vader.
One popular 'Anakin Palpatine fanfic' could be 'The Sith's Apprentice'. It delves deep into the complex relationship between Anakin and Palpatine during Anakin's fall to the dark side. The story shows how Palpatine's manipulation of Anakin was not just about power, but also about filling the void in Anakin's heart after the loss of his mother and his fear of losing Padmé.
It could have completely changed the course of the Star Wars universe. With Palpatine out of the picture, the Sith might have crumbled and the Jedi could have regained their influence.