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.
It would have a huge impact on the characters. For example, Luke and Leia would grow up in a very different environment. Without Palpatine's influence, the Rebel Alliance might not have had as strong a cause, but there would still be a need to restructure the galaxy. Anakin's actions would also change the perception of the Force. The balance between the light and the dark side would shift, and the Jedi might have to reevaluate their teachings. It could lead to a more harmonious coexistence of the different Force - using groups in the long run.
The plot might involve Anakin being influenced by the good side of the Force more strongly. He starts having visions of a dark future if Palpatine continues to rule. Anakin then starts to secretly gather allies, including some Jedi who have survived Order 66. Together, they plan an attack on Palpatine. Anakin, with his enhanced power, confronts Palpatine directly. Their battle could be not just physical but also a battle of wills, with Anakin finally emerging victorious as he overcomes the dark side's allure within himself.
As he spends more time as a Sith, he might start to feel a sense of emptiness. He realizes that the power he sought isn't fulfilling. He could then have a moment of self - reflection. Maybe he meets a character who challenges his beliefs, like a young Force - sensitive who still believes in the good in the galaxy. This makes him question his path and start to seek a way back from the dark side.
The plot of Revenge of the Sith centers around the final stages of the Clone Wars and Anakin Skywalker's descent to the dark side. It's a complex and intense story with lots of action and drama.
Had Anakin killed Palpatine, it's likely that there would have been chaos initially. Different factions might have vied for control. But in the long run, it could have paved the way for a new era of hope and stability in the Star Wars galaxy.
One highly regarded fanfic that has been adapted into some great visual interpretations is 'The Sith Apprentice's Journey'. It delves deeper into the backstory of some of the Sith characters in the movie. Another good one is 'A Different Ending for Anakin', which offers an alternative take on Anakin's fall to the Dark Side. These fanfics often have fan - made videos on platforms like AO3 or YouTube that are worth watching.
One of the main themes is the fall of Anakin Skywalker. His journey from a Jedi Knight to Darth Vader is central. Another theme is the collapse of the Republic. The political intrigue and manipulation that lead to its downfall are explored. Also, the theme of friendship and betrayal is there, as Anakin betrays his friends and the Jedi Order.