One idea could be a crossover where characters from Earth's history, like ancient Egyptian pharaohs, team up with Jedi from Star Wars to fight against the Goa'uld from Stargate. They could combine their unique powers and technologies. For example, the Jedi's use of the Force and lightsabers along with the pharaohs' knowledge of magic and the Goa'uld's advanced weaponry would make for an exciting story.
In a Stargate and Star Wars crossover, imagine the Stargate teams finding a portal that leads to a planet in the Star Wars universe. They end up in the middle of a battle between the Empire and the Rebellion. The Stargate teams have to decide which side to support and how to use their own skills and technology, like the wormhole - creating Stargates, to influence the outcome of the battle.
A fanfiction could focus on a group of Earth scientists who discover a way to travel to the Star Wars galaxy. Once there, they try to introduce Earth's scientific concepts to the Star Wars universe, while also getting caught up in the conflict between the Sith and the Jedi. Maybe they help the Jedi develop new ways to combat the Sith using Earth technology.
Maybe there's a fanfiction where a Sith Lord tries to take over Earth. The Earth's military would be no match for the Sith's powers at first. But then, through some clever thinking and the discovery of a hidden Earth - based energy source similar to the Force, they start to fight back.
Perhaps in the fanfiction, the technology from Star Wars is used to explore the deepest parts of Planet Earth. For example, using starships to reach unexplored caves or the ocean floor.
One idea could be Jedi coming to Earth to train a select group of humans with Force - like abilities. Another could be a Sith Lord arriving on Earth and causing chaos, and Earth's heroes have to team up with Star Wars characters to stop him. Maybe there's a discovery of a hidden Star Wars - related artifact on Earth that has the power to change the balance of the Force.
One idea could be a story where Earthlings discover a long - lost Jedi temple on Earth. This temple holds ancient secrets and powers that could change the balance of the Force in the Star Wars galaxy. Maybe some Earthlings have latent Force - sensitive abilities that are awakened by the discovery.
Another idea is that a group of Jedi, on a mission related to the Clone Wars, end up on Earth. They discover a hidden Force-sensitive group here. Together, they work to protect this group from the threat of the Separatists who also somehow find their way to Earth.
Another interesting angle would be to have a Clone Wars character, like Anakin Skywalker, land on Earth for some reason. His presence could cause a stir among the people, and his Jedi powers would be both fascinating and potentially terrifying to the Earth population.
One idea could be a human from Earth somehow getting transported into the Star Wars universe and having to adapt to the use of the Force. They might start as a complete novice but quickly learn and use their unique perspective from Earth to gain allies. For example, they could introduce Earth technology concepts to the Star Wars characters.
Perhaps the Earth Defense Fleet could get stranded in the Star Wars universe. They then have to use their unique Earth - based technology in combination with Star Wars tech to find their way back home while also getting involved in local conflicts.
One idea could be that the girl from Earth discovers a hidden Jedi power within herself. Maybe she has a unique connection to the Force that no one on Earth or in the Star Wars galaxy has seen before. This could lead to her being hunted by both the Sith and the Jedi, as they are unsure whether she is a threat or a new hope.
Another fanfiction concept could involve Jedi and Sith being reincarnated on Earth. They'd have to adapt to modern society while still holding onto their powers and the eternal struggle between the light and dark side. For example, a young Jedi might discover their powers in a world full of distractions and temptations, and they'd have to learn how to use them for good.