There could be a fanfiction where characters from Star Wars visit Earth for some unknown reason. Maybe they are on a quest for a special resource that only Earth has, and they interact with Earthlings in really funny or unexpected ways.
A great fanfiction idea might be a story in which Earth becomes a part of the Star Wars universe. The governments of Earth have to deal with the Galactic Empire or the New Republic, and normal people get involved in the intergalactic politics and battles.
One interesting fanfiction could be about a new Jedi on Earth who discovers their powers in a modern setting. They might have to hide their abilities from the non - Force - sensitive population while also trying to find other Force - users.
One interesting Star Wars Earth fanfiction could be about a Jedi who secretly lives on Earth and uses his powers to help those in need without revealing his true identity. For example, he might use the Force to stop a natural disaster or prevent a crime in a big city.
One interesting fanfiction could be about a character from Star Wars finding themselves in the world of Empire Earth. Maybe a Jedi has to adapt to the different warfare and cultures in Empire Earth. For example, they might use their lightsaber skills in a battle against the medieval - style armies in Empire Earth.
Luke Skywalker is often popular. Writers might put him in situations on Earth, like him teaching a group of Earthlings about the Force. Another popular one is Darth Vader. People like to explore his backstory and how he would act if he were on Earth.
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.
One interesting storyline could be the Jedi and Sith having to hide their powers in a modern-day city. They might have to blend in while still being true to their code or the dark side's temptations.
One interesting crossover could be the Jedi interacting with Earth's ancient warriors. Imagine a Jedi Knight facing off against a samurai. The Jedi's lightsaber skills against the samurai's katana. Another could be the Clone Troopers being transported to Earth during a major battle and having to adapt to Earth's terrains and cultures.
The Separatist droids would have a harder time adapting. Their programming is mainly for the Star Wars universe battles. But they could be reprogrammed by some Earth scientists or hackers, which could lead to some very unexpected situations, like droids being used for peaceful construction projects instead of war.
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.
A character who is an Earth historian could also be fascinating. In the Star Wars world, they could study the ancient cultures and civilizations of different planets, comparing them to the historical events on Earth. They might discover parallels between the rise and fall of empires in both universes and use that knowledge to predict future events in the Star Wars galaxy.
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.