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.
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.
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.
Often, Obi - Wan uses his mastery of the Force. He might use a Force - push to overpower his guards when they least expect it and then make a run for it. He could also use a mind trick on a high - ranking captor to order his release.
Perhaps Obi - Wan uses his Jedi skills in a creative way. For example, he could use a Force - related technique that shields Anakin from the influence of the Sith. He might create a sort of Force barrier around Anakin's mind, preventing the dark whispers from corrupting him further.