How about a story where Rapunzel's long hair has some sort of connection to the Force? Maybe her hair can be used as a conduit for the Force, and she travels to the Star Wars universe to help the Jedi. Or, consider a scenario where Leia is seen as a Disney - style princess in a different light. Her diplomatic skills and leadership could be compared to those of classic Disney princesses, and a fanfiction could explore this parallel more deeply.
A Star Wars and Disney princess fanfiction idea could be that Jasmine is a rebel spy in the Star Wars universe. She uses her skills of stealth and charm, which she developed in Agrabah, to gather intelligence for the Rebel Alliance. Another idea is that Mulan joins the Jedi Order. Her martial arts skills and strong sense of duty would make her a great Jedi.
One interesting idea could be characters from Disney movies interacting with Star Wars characters in unexpected ways. For example, Mickey Mouse might find himself on the Millennium Falcon, causing chaos with his cheerful and curious nature. Another idea could be a Disney princess using the Force. Maybe Belle could use her intelligence and newfound Force powers to outwit the Sith Lords. And then there's the concept of Disney sidekicks in the Star Wars universe. Like how Dopey from Snow White could accidentally cause a distraction during a lightsaber battle.
One way to combine them creatively is to have a Disney princess end up in the Star Wars universe. For example, Belle could be a diplomat on a planet in the Star Wars galaxy, using her intelligence to negotiate treaties. Another idea is to give a Star Wars character the traits of a Disney princess. Maybe Rey could be seen as a kind of 'princess' figure, with her own 'castle' (the Millennium Falcon) and her loyal 'subjects' (her friends).
One idea could be exploring the backstory of a minor character in Star Wars 1. For example, a young Padawan who was on the same Jedi training grounds as Anakin but had a very different path. Another could be a fanfiction that focuses on the political intrigue on Naboo before the Trade Federation blockade. Maybe there were some secret meetings or power plays that we didn't see in the movie. A third idea is to write a story from the perspective of a droid during the events of Star Wars 1, like how they experienced the chaos and battles.
One idea could be a fanfiction where Snow White is not rescued by the prince in time and the forest she's in gradually corrupts her, turning her into a dark protector of the woods with a more cynical view of the world. Another could be about Ariel, but instead of happily getting her legs, she discovers that the human world is full of more danger and betrayal than she expected, leading her on a dark path of revenge. And for Cinderella, perhaps in the fanfiction, she uses her newfound status after marrying the prince to exact revenge on those who mistreated her in a more sinister way.
One interesting fanfiction could be about a new Jedi apprentice discovered in a far - flung corner of the galaxy. This apprentice has unique Force abilities that are different from the traditional Jedi skills. Another might be a story where the characters from different Star Wars eras interact, like Darth Vader meeting Rey. There are also fanfictions that explore the backstories of minor characters, such as how a Stormtrooper became disillusioned with the Empire.
One interesting Star Wars Disney fanfiction could be a story where Rey teams up with some of the classic Disney characters in a parallel universe. For example, she might meet Mickey Mouse who helps her find a hidden Jedi relic. Another could be a story about Kylo Ren's redemption arc that involves him interacting with Disney - inspired magic. There are also fanfictions that explore the backstories of minor Star Wars characters in the Disney - era of the franchise in a more creative way.
A plot could involve Darth Vader having visions of a different future where he and Princess Leia are on the same side. These visions start to haunt him, and he begins to subtly protect her from the Emperor's wrath. In the meantime, Leia senses a change in Vader's behavior and tries to figure out if she can use this to the advantage of the Rebel Alliance. For example, she might try to convince him to turn against the Empire completely.
One idea could be a story where Cinderella and Belle become friends and exchange their experiences of dealing with difficult situations. Cinderella could share her story of escaping from her stepmother's tyranny, and Belle could talk about how she coped with the Beast at first.
Perhaps a fanfiction where a group of gamers create their own custom clone units in the game and then those units somehow become real in the Star Wars universe. They then have to train and lead these unique clones in battles.
One idea could be exploring the origin of a new, mysterious force - user in the Shadow Wars. Maybe it's a forgotten Jedi or Sith technique that resurfaces and causes chaos. Another could be focusing on the relationship between a group of rebels and how they deal with the added threat of the Shadow Wars.