Perhaps there's a fanfiction where a Star Wars character is transported to the Gundam universe. They bring with them their unique Force - related abilities, which are both a mystery and a potential source of power in the Gundam world. They could end up joining a Gundam squadron and using their Jedi training to enhance the squadron's combat capabilities.
One idea could be to have the mobile suits from Gundam integrated into the Star Wars universe's battles. For example, the RX - 78 - 2 Gundam could be a new type of powerful mecha that the Rebel Alliance discovers and uses against the Empire. Another idea is to have the Jedi and Sith interact with the Newtype pilots from Gundam. Maybe a Jedi could sense the unique abilities of a Newtype and try to train them in the ways of the Force.
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.
A great plot idea would be to have a story centered around a group of younglings who are accidentally caught in the crossfire of a Clone Wars battle. They have to rely on their basic Jedi training and the help of some friendly clone troopers to survive. As they journey through the war - torn landscape, they grow and learn more about the reality of the war. Also, a story about a Separatist scientist who has a change of heart and tries to defect to the Republic with valuable information about new droid technology could be really interesting. He has to avoid being hunted down by his former allies while trying to make his way to the Republic lines.
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.
One idea could be a crossover where Robocop is transported to the Star Wars universe. He could end up on a planet like Tatooine and have to deal with the local criminals and bounty hunters using his advanced weaponry and law - enforcement skills. Maybe he teams up with a young Jedi in training to take on a Sith - influenced crime syndicate.
Imagine a fanfic where certain Pokemon species are native to specific planets in the Star Wars galaxy. Like, water - type Pokemon on Naboo. And there could be a story about a young Jedi who discovers a Pokemon egg on a strange planet. He takes it with him and as it hatches, they form a bond, and together they go on adventures, facing the challenges of both the Sith and other powerful Pokemon trainers.