There are some Imperial officers who are important as well. They interact with the Sith Lords and are caught in the middle of their power plays. Their actions and decisions can sometimes influence the Sith's plans, and they also show how the Sith's influence extends throughout the Empire. Some of these officers may have their own agendas that may or may not align with those of the Sith.
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 are also other Sith acolytes and those who oppose the Sith, like some of the Rebel forces. These characters add depth to the story as they either support or fight against the Lords of the Sith. They bring out different aspects of the conflict between the Sith and the rest of the galaxy.
The Sith Lords themselves are main characters, of course.
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 his former apprentice. And Yoda, the wise Jedi Master who tries to counter the Sith's plot. Also, Padmé, whose love for Anakin is a key factor in the whole drama.
Power is a main theme. The Sith Lords are constantly seeking more power, which drives their actions and plots throughout the novel.
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 within their dark order. Another important theme is the struggle for control. In the story, there are constant battles over who will control certain territories or groups. And of course, the theme of the dark side of the Force is always present, showing how it twists and changes those who use it.
In Clone Wars fanfiction, Darth Maul stands out. He was initially thought to be dead after 'The Phantom Menace' but his return in Clone Wars brought a new level of danger. His thirst for revenge against Obi - Wan Kenobi and his attempts to regain his former power are common themes. Darth Sidious is also key. His devious plans to create chaos and gain ultimate power are often explored in fanfiction. He was using the Clone Wars as a means to an end, and fan writers love to play with the idea of what his true endgame was.
In this graphic novel, Anakin Skywalker is crucial. His journey from a Jedi Knight to Darth Vader is what the story is largely about. Palpatine is also extremely important as he is the mastermind behind Anakin's fall. And Padmé Amidala, as her relationship with Anakin affects his decisions.
Well, consider Darth Sidious. He was pulling the strings from the shadows. He had the clone army created with a hidden order to turn on the Jedi. His puppet, Darth Tyranus, was out in the open leading the Separatist forces. This caused the Republic to mobilize their clone army against the Separatists. Darth Maul also had an influence. His presence and his thirst for revenge led to battles and skirmishes that were not originally part of the main conflict. All these Sith Lords together made the Clone Wars a much more complex and deadly affair.
Perhaps there are some neutral characters who get caught in the middle of the conflict between the Sith and the Jedi. They could be ordinary people, or they could be some other species in the Star Wars galaxy that are trying to survive the chaos that the Sith Lords bring with their power - hungry ways.
Anakin Skywalker is a main character. He is the one who undergoes the major transformation in the story, from Jedi to Sith. Obi - Wan Kenobi is also important. He is Anakin's mentor and later has to face him. Padmé Amidala is a key character too as Anakin's love interest.
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 in her ability to manipulate the minds of her enemies, which she uses to great effect during battles in the Clone Wars.