An ancient being that has been dormant in the Force for centuries. When awakened, they have a very different understanding of the Force compared to the modern Jedi and Sith. This character could introduce forgotten or lost knowledge about the Force, causing chaos or enlightenment depending on how the other characters in the fanfiction react to their teachings.
A character who is a Force - sensitive outcast from a planet that has no knowledge of the Force. This character discovers their powers by accident and has to learn about the Force on their own, without any Jedi or Sith teachings. They might develop a completely new way of using the Force that combines their native planet's culture and values.
Another unique portrayal could be making the Force a sentient entity that can communicate directly with chosen individuals. It doesn't just give them power or guidance through feelings, but actually has conversations with them. This could completely change the dynamic of the Star Wars universe in the fanfiction, as characters would have to deal with the Force as a real being with its own motives and desires.
A sentient droid that has its own unique understanding of the Force. It could be a droid that was created by an ancient Jedi or Sith as an experiment. This droid would have abilities that no other droid has, like being able to sense Force users from a distance or even manipulate the Force in a small way.
Obi - Wan Kenobi is highly popular too. His calm and collected nature as a Force Ghost can be used in various ways. He might be a mentor figure to younglings, or he could be involved in some sort of spiritual battle against the dark side, using his knowledge and connection to the Force to fend off evil influences.
A neutral force user in Star Wars could be a really interesting character. For example, my OC could be a loner who travels the galaxy, not really siding with the Jedi or the Sith. They might use the Force to find ancient artifacts that are neither good nor evil, but hold great power. This OC could be constantly on the run from both the Jedi Order and the Sith Lords, as they don't want their power to be exploited by either side.
Starkiller is definitely one of the most popular. As the main character in the game, he has a lot of potential for further development in fanfiction. His complex relationship with Darth Vader also makes for interesting storylines. Another popular character is Juno Eclipse. Her role as Starkiller's love interest and her own skills as a pilot give her a lot of room for exploration in fan - created stories.
A really cool concept is when Force Ghosts from different eras interact. Picture Anakin Skywalker's Force Ghost chatting with Revan's Force Ghost. They could compare their experiences, talk about the different manifestations of the Force in their times, and perhaps even collaborate on a mission to save the galaxy from a new threat.
Well, in some 'Star Wars Force Awakens' fanfiction, there are concepts like a hidden Jedi order that has been secretly guiding events. This adds a whole new layer of mystery to the story. Also, there could be fanfictions that focus on the relationship between Finn and Poe in more detail, showing their friendship developing in different scenarios. Some might even rewrite the entire plot to make Kylo Ren a more complex and redeemable character from the start.
In Star Wars The Force Unleashed fanfiction, an interesting concept is the redemption arcs. Some fanfics might focus on characters who were considered villains in the game getting a chance at redemption. This could add a lot of depth to their personalities. Also, the exploration of the dark side of the Force in more detail can be fascinating. Writers can show how characters are tempted by the dark side and what it really means to embrace it, which might be different from what we've seen in the official Star Wars media.
Rey is very interesting. She is a strong and independent character who has to fend for herself on Jakku before getting drawn into the galactic conflict. Her journey of self - discovery as she realizes her Force powers is captivating.
Starkiller is a very interesting character. He has such a complex relationship with the Force and his masters. His journey from being a tool of the dark side to exploring his own identity is captivating.