Well, it would make sense for some of Dooku's fellow Jedi from his early days to be in the story. Maybe Eeth Koth or Plo Koon. They could provide a contrast to Dooku's path. And on the Sith side, Savage Opress could be included. He had some interactions with Dooku. Also, Anakin Skywalker might make an appearance, as Dooku played a role in Anakin's journey, especially during their duels.
Ventress is also a commonly used character. Her complex backstory, from being a Sith apprentice to having ties to the Nightsisters, gives a lot of room for fanfiction. Writers can delve into her internal struggles between the dark side she was taught by Dooku and the Nightsister heritage she has.
One idea could be a Nightsister who tries to break away from the traditional dark ways of her clan and seek a new path in the Force. She might encounter a Jedi who initially distrusts her but comes to see her good intentions as they face a common enemy.
One great 'anakin dooku fanfic' is 'The Duel Unseen'. It offers a unique perspective on their relationship and the events that could have happened between them.
Dooku died at the hands of Anakin Skywalker in the novel. Anakin, under certain circumstances and influenced by various factors, was the one who ended Dooku's life. This event had far - reaching consequences for Anakin's own character development as well.
In a Dooku - centered fanfic in The Clone Wars, Qui - Gon Jinn could be an interesting addition. Even though he's dead, Dooku could be haunted by memories of his former apprentice. This could add an emotional layer to the story. Count Dooku's own family members, if any are explored in the Star Wars lore, could also be included. Their influence on his decisions, or how he thinks about them while being a Sith, could be fascinating. Also, other Sith Lords or acolytes that Dooku might interact with in the shadows during the Clone Wars would be cool to include.
One interesting plot idea could be exploring Dooku's early days in the Sith. Maybe showing how he was gradually corrupted by Sidious. Another could be a story where Dooku has a change of heart briefly and tries to make amends in some small way during the Clone Wars, but is quickly pulled back into the dark side by Sidious' influence. A third idea could be a fanfic that focuses on Dooku's relationship with his former Jedi colleagues during the Clone Wars, like how he feels when facing them in battle.
Count Dooku, born into a noble family on Serenno. He trained as a Jedi under Yoda and others. However, his views on the Jedi's role in the galaxy changed over time. He was seduced by Darth Sidious's power and promises. As a Sith, he had his own lightsaber skills and a thirst for power. He led the Confederacy of Independent Systems, which was in fact a tool for the Sith to gain control. He also trained General Grievous to be a formidable warrior against the Jedi.
In the novel, Dooku's death is significant as it marks the end of a complex character. His death is a turning point in the story's plot, shifting the power dynamics. It also symbolizes the fall of a once - powerful Sith Lord, with implications for the overall struggle between the Jedi and the Sith.