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.
Archive of Our Own (AO3) is also a great place to look for 'anakin dooku fanfic'. It has a well - organized tagging system which makes it easier to search for specific themes or types of stories related to Anakin and Dooku. The community on AO3 is also very active, so you can often find new and interesting fanfics.
Anakin managed to defeat Dooku through a combination of his raw Force power and determination. He used his lightsaber skills and quick thinking to gain the upper hand.
In this fanfiction, the plot could center around Anakin's struggle with the two different ideologies of the Jedi and Dooku. Dooku, as his trainer, might expose Anakin to the Sith ways. This could lead to Anakin having internal conflicts, as he has to decide whether to stay loyal to the Jedi or follow Dooku's path. His training could involve learning more aggressive and unorthodox Force abilities that are frowned upon by the Jedi, and his interactions with Dooku could gradually change his view of the galaxy and his place in it.
The main characters would surely be Anakin Skywalker and Count Dooku. Anakin is the protagonist in a sense as we would see his development through Dooku's training. Dooku, on the other hand, is the one who imparts his knowledge and skills, and his character would also be explored in terms of his motives for training Anakin.
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.
One key theme is often the exploration of the gray area between good and evil. When Obi - Wan joins Dooku, it challenges the traditional view of the Jedi as pure good and the Sith as pure evil.
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.
There could be a hermit or an outcast Jedi or Sith on Dathomir. Anakin meeting this character could lead to a great revelation. Maybe this character has been in hiding on Dathomir for years, observing the balance of the Force there, and Anakin's arrival disrupts that balance and forces an interaction that changes Anakin's perspective on many things.