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.
The scenario of Obi Wan joining Dooku would be quite dramatic. It could potentially rewrite the entire fate of the galaxy. Maybe Obi Wan would have different motives or be under some kind of mind control.
If Obi-Wan joined Dooku, there might have been a power struggle between them. Also, it could have affected the relationships with other characters and the balance of the Force in unexpected ways.
One popular 'obi wan joined dooku fanfic' might be 'The Unlikely Alliance' where Obi - Wan's journey with Dooku is filled with political intrigue and moral dilemmas as they try to reshape the Jedi Order. It's a great read if you like exploring different character dynamics.
One interesting plotline could be a battle that takes place in an alternate universe where Anakin and Obi - Wan have different allegiances from the start. Maybe Anakin is a Sith Lord right from the beginning and Obi - Wan has to face his former apprentice in a more cut - throat battle.
Anakin and Obi - Wan could fit into a Marvel fanfic if they were part of a multiverse - spanning story. The Marvel universe already has concepts like the multiverse. They could be brought in as representatives of a different kind of power (the Force). Anakin's emotional and sometimes unpredictable nature could create interesting dynamics with the more stable Marvel heroes. Obi - Wan could act as a mediator between the two universes, using his knowledge of the Force and his diplomatic abilities to navigate the complex relationships in the Marvel world.
Well, Anakin is often very well - written. His internal conflict between the light and dark side can be explored in great detail. His complex relationship with Obi - Wan, from being a beloved apprentice to a bitter enemy, gives a lot of room for character development. Writers can show his journey from a hopeful Jedi to a conflicted individual on the verge of falling to the dark side.
Well, it could be really chaotic. Maybe Anakin and Obi - Wan would be mistaken for new superhumans in the Marvel universe. Their lightsabers would be seen as some sort of high - tech weapons. They might end up getting involved in the Avengers' battles, either as allies or foes depending on how the story is written. Anakin's power could be compared to that of Scarlet Witch, and Obi - Wan's wisdom might be on par with Doctor Strange's.
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.