The Emperor, of course. He is a central figure in the Sith hierarchy. His manipulations and his grand schemes play a major role in the events of the novel. There...
Well, one of the themes is loyalty. We see how the Sith Lords' minions are loyal to them, and also how the Sith Lords themselves have a sort of loyalty...
There could be a young Sith apprentice as a main character. This character is eager to prove themselves within the tribe and gain more power. They might be involved in...
The main character is, of course, the Sith Warrior. There are also likely Sith masters who play important roles in the story, guiding or manipulating the Sith Warrior. And there...
One memorable OC Sith could be Darth Zyra. She has a very distinct look with her purple - hued lightsaber and her elaborate black and red robes. Her power lies...
Definitely Anakin Skywalker. He's the one who goes through the most drastic change. Then there's Palpatine, the mastermind behind the Sith's plan. Obi - Wan Kenobi, who has to face...
Rey is the most prominent character as the fanfictions are often centered around her and the Sith. Luke Skywalker can be quite popular too. He can be a guiding figure...
The Sith OC is obviously a central character. Then there are often female Sith apprentices or acolytes in the harem. There might also be alien species with Sith - like...