One possible main character could be a young Earthling with a natural affinity for the Force, discovered during the invasion. Or it could be a group of misfits from different parts of Earth who band together, similar to the crew in the Millennium Falcon, to fight the Empire.
Perhaps a Jedi who has been in hiding on Earth all this time and comes out to lead the resistance against the invading Empire. Another option could be an Imperial officer who has a change of heart and decides to help Earth instead.
It could be an ordinary human on Earth who rises to become a hero against the Empire. Maybe a scientist who figures out a way to counter the Empire's force powers.
In such a fanfic, there could be epic battles. The Empire's advanced weaponry like the Death Star might be used against Earth's defenses. Maybe the Rebel Alliance would also get involved, teaming up with Earth's forces to fight the common enemy.
Luke Skywalker could be one of the main characters. He might come to Earth to spread the teachings of the Jedi. Another could be Darth Vader, if he somehow survived and ended up on Earth, causing chaos and trying to rule over the planet.
A character could be a Force - sensitive child from the United Earth Empire. He was born with this power but was hidden away on Earth. When the Empire discovers his abilities, they want to use him as a weapon. However, he is befriended by a group of rebels who help him understand the true nature of the Force and fight against the Empire's evil plans.
One possible main character could be an Earth scientist. They would be in a unique position to study the Empire's technology and try to find a way to defend Earth.
Well, one possibility is that the technology from Star Wars would start to merge with Earth's. Droids could become common household items, helping with daily chores. And starships might be parked in our skies, changing the whole dynamic of Earth's society as people try to figure out how to interact with these new, alien things.
One possibility for the main character in a 'Star Wars Earth First Contact' fanfic could be a Mandalorian. Mandalorians are known for their combat skills and their unique code of honor. Landing on Earth, they would face a whole new set of challenges and cultures. They might initially see Earth as a potential place for conquest or plunder but then develop a more complex relationship with the planet. Additionally, an astromech droid like R2 - D2 could be a main character. It could communicate in its own way with Earth technology and help bridge the gap between the two worlds, all while having its own little droid adventures on Earth.
One main character could be a droid technician working for the Empire. They might be involved in creating new and more powerful droids for the Imperial military. A Twi'lek slave who has been forced to serve in an Imperial household could also be a main character. This character could be plotting their escape while also learning secrets about the Empire's inner workings. Additionally, a Mandalorian who has made a deal with the Empire to gain certain resources or advantages. But as time passes, they realize the true cost of serving the Empire.
An experimental subject, a Force - sensitive being who manages to break free from the Empire's control and then becomes a key figure in fighting against the Empire's evil plans.
The droids in Star Wars could be used by the Earth Empire for various tasks. However, they might also face issues like compatibility with Earth's power sources. And the hyperdrive technology from Star Wars could revolutionize Earth Empire's space exploration capabilities if they could figure out how to integrate it into their existing spacecraft.
It could be a Rebel spy within the Empire. This spy would be constantly trying to undermine the OC's progress and expose their true intentions. The spy might see the OC as a threat to the Rebellion's plans, especially if the OC is rising in the ranks quickly.