A really cool fanfiction idea would be if Kylo Ren somehow ended up in the world of Frozen. He could be initially seen as a threat, but then Elsa realizes that he has some good in him due to his internal conflict, much like her own struggle with her powers. Or perhaps a story where the Ewoks meet the trolls from Frozen. They could exchange their knowledge of the forest and magic respectively.
Here's an interesting concept. What if the Millennium Falcon crashed in Arendelle? Han Solo and Chewbacca would have to interact with the Frozen characters to repair their ship. Anna and Elsa could be fascinated by the technology of the Falcon, and in the process, they all team up to face a common threat that is approaching both their worlds.
Well, a really cool plot could be that the Frozen world is actually a long - lost planet in the Star Wars galaxy. The characters from Frozen get involved in the Galactic Civil War. Maybe Kristoff, who is used to cold environments, helps the Rebel Alliance on an ice - covered planet. Elsa could also use her ice powers to create defenses against the Empire's attacks, like building ice walls around Rebel bases. And Anna could befriend some of the alien species in the Star Wars universe and convince them to join the fight against the Empire.
One interesting 'Star Wars Frozen' fanfiction could be about Elsa using her ice powers in the Star Wars universe. Maybe she teams up with a Jedi to fight against the Sith. Another could be a story where Anna travels to different planets in the Star Wars galaxy in search of a way to save Arendelle.
One interesting storyline could be Princess Leia and Elsa teaming up. Maybe they use their leadership skills and powers respectively to save both galaxies from a new threat that somehow spans across the Star Wars and Frozen universes. For example, a dark force that freezes planets in the Star Wars galaxy while also causing chaos in Arendelle.
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.
Some interesting Frozen 2 fanfiction plot ideas could revolve around the idea of a magical item. For example, there could be a magical crystal hidden deep in the forest that has the power to either save or destroy both the forest and Arendelle. Elsa and her friends embark on a quest to find this crystal before it falls into the wrong hands. Another idea is that a dark force from outside the known world tries to invade the forest and Arendelle, and the characters have to unite not only the people of Arendelle and the forest but also other magical beings to fight against it. Also, a plot could be centered around a prophecy that was never fully revealed in the movie, and Elsa and Anna must figure out what it means for their future.
In Star Wars system fanfiction, a cool concept is to rewrite certain events with different outcomes. Like what if Anakin Skywalker didn't turn to the Dark Side? This could lead to a completely different Galactic Empire or even a more harmonious galaxy. Also, imagining new Jedi or Sith orders with their own sets of rules and philosophies can be really engaging.
In genderswap fanfiction, Leia as a male character could change the whole dynamic of her relationship with Han Solo. Maybe he'd be more of a brooding, serious type, while still maintaining that charm and roguishness. It could also impact the way he leads in the Rebel Alliance.
One idea could be exploring the backstories of minor characters' allegiances. For example, a stormtrooper who starts to question the Empire's motives. Another could be a story about a Jedi who has to choose between different factions during a time of great upheaval in the galaxy. Maybe a story about a smuggler who gets caught in the middle of the fight between the Rebellion and the Empire and has to decide which side to support.
A really cool idea for a Star Wars party fanfiction would be a party on a starship that's traveling through hyperspace. The crew could be from all different species and allegiances. There could be a mystery at the party, like a smuggled item that's being passed around. The characters have to figure out who has it and what it is while also enjoying the party. It could involve characters like Han Solo and Chewbacca getting into some funny situations as they try to solve the mystery.
One idea could be that Naruto characters are somehow transported to the Star Wars universe. For example, Naruto with his chakra abilities could be seen as a new kind of Force user. He might team up with Jedi or Sith, depending on the plot. Another idea is a crossover of the two worlds' technology and magic. The lightsabers in the hands of Naruto characters or the use of Sharingan to predict lightsaber strikes.