It could be a former Sith apprentice. After seeing the cruel and self - destructive nature of the Sith, she decides to defect. She then has to face the wrath of her former master while also trying to find a new place in the galaxy, all while being 'freed from darkness'.
A fallen Jedi who wants to return to the light side could be the main character. He might have been corrupted by the dark side but now is struggling to break free. His journey of self - discovery and redemption could be the focus of the story.
One possibility is that it's centered around a young Force - sensitive individual who was kidnapped or indoctrinated by the dark side. This person then manages to escape the clutches of the Sith or other dark entities. Along the way, they might meet various characters who help them, like a wise old Jedi in hiding or a group of smugglers with a heart of gold. As they journey, they gradually learn to use the Force for good and are thus 'freed from darkness'.
A Rebel pilot could be the main character. After getting injured in a battle and having some dental problems as a result, they decide to study dentistry while recovering. They then use their new skills to help their fellow Rebels. They might even find a way to use dental tools as weapons in a pinch, like using a dental drill to break through enemy ship controls if they are captured.
A young scavenger from a planet in the Outer Rim could be the main character. They find the Darksaber by chance and then are thrust into the larger Star Wars universe, having to learn about the weapon and deal with those who would kill to have it.
In this fanfiction, it could be that the Sith from Star Wars somehow make an alliance with the dark forces in Naruto's world. Konoha then has to rely on both their ninja skills and some newfound Star Wars - like technology or magic that has also been brought into their world. For example, lightsabers could be modified to be used by ninja, and the Force could be a new power source that some characters start to explore.
It could be a former Imperial officer who has seen the error of his ways. After the fall of the Empire, he tries to live a normal life but is drawn back into the conflict when he discovers signs of the Empire's return. He uses his knowledge of Imperial tactics to help the resistance against the returning threat.
An alien species member who has a completely different view of the Force compared to both the Jedi and the Sith. This character could come to the galaxy's main powers and try to change the orders. Their unique biology and culture give them a different perspective on the Force, and they believe that by changing the orders, a new era of peace and understanding can be achieved in the galaxy.
It could be a previously unknown son of Luke Skywalker. Maybe he was hidden away for some reason and now he's lost in the galaxy, trying to find his father or his place among the Jedi.
It could be a young Imperial officer who starts to question the Empire's extreme measures for revenge. This character might see the wrong in what the Empire is doing and eventually defect to the Rebellion.
An engineer or scientist who was involved in the creation of the clones could be the main character. They could have a change of heart and try to find a way to give the clones more freedom and individuality. This character would have to deal with the ethical implications of their actions as well as the political and military forces that want to keep the clones as they are.
A Mandalorian could be the main character. Mandalorians have a rich culture and history in Star Wars. A story about a Mandalorian who has to break from their traditional ways to save the galaxy from a new threat, like a powerful Sith Lord or a dangerous alien race, would be exciting. They could use their unique combat skills and armor to fight against the odds.