One possible plot could be that the 'banished emperor' Naruto is exiled from his village due to false accusations. He then travels to different lands, learning new skills and making unexpected allies. Along the way, he discovers a conspiracy that threatens not only his village but the entire ninja world.
Maybe the main antagonist is a group within Naruto's own village. The elders or some of the more conservative clans who banished Naruto in the first place. They fear that if Naruto returns as the banished emperor, he will change the power structure that they have been maintaining for so long. So they do everything they can to stop him from coming back, even if it means allying with outside forces.
In the ending of Love in the Great Han Dynasty, Song in the Cloud, Liu Che, Emperor Wu of the Han Dynasty, did not become emperor, and Liu Xun, Emperor Xuan of the Han Dynasty, inherited the throne.
He would likely become more ruthless. As a Sith Emperor, Naruto would have to make tough decisions that go against his usually kind - hearted nature. For example, he might have to sacrifice some of his friends or allies for the greater good of his empire.
Naruto might also initially feel a sense of abandonment. However, his kind - hearted nature could lead him to try and see the good in the situation. He could start to explore the world outside, learning about different cultures and ninja techniques. He may use this experience to become more empathetic towards others who have also faced hardships, and in the long run, this banishment could be a turning point in his life to become an even greater ninja.
At first, Naruto is probably shocked and confused. He might not understand why the village would take such a harsh step just for hurting Sasuke. He may feel betrayed, especially if he thought he had friends and allies in the village.
I'm not entirely sure specifically what a 'banished naruto sith fanfiction' is about without reading it. But generally, it might be a fan - created story where Naruto is banished and somehow gets involved with the Sith concept from Star Wars. It could be a very creative crossover where the author explores how Naruto's abilities and character would interact in a Sith - influenced world.
I'm not entirely sure as it could be many things. It might be a fanfiction where Naruto has god - like powers and gets banished from his village. Maybe it explores how he copes with being banished while having such extraordinary abilities.
It could be about Naruto being banished from the village in a fan - created story. Maybe it explores how he copes with being exiled, his journey to regain his place, or the relationships he has to deal with outside the village.