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.
Well, that would have been quite a twist. It might have meant Obi-Wan becoming more morally ambiguous and facing opposition from his former allies. Plus, it could have complicated the already complex web of politics in the Star Wars universe.
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.
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.
If Obi - Wan travels back in time, his character would become more self - aware. He would have the knowledge of his past mistakes and would be more cautious. For example, in his relationship with Anakin, he might be more empathetic from the start, understanding Anakin's insecurities better. This would lead to a different dynamic between them, and perhaps Anakin would not be so easily swayed by the Dark Side. Also, Obi - Wan would be more confident in his Jedi abilities as he has already seen the heights and lows of the Jedi Order in his own time.
It could have led to a major shift in the Star Wars universe. Maybe Luke's allegiance change would have caused chaos among the Rebel Alliance.
In a fanfic where they go to the future, they might be shocked by the advanced technology. Maybe they see flying cars and buildings that touch the sky. Anakin could be intrigued by new forms of lightsaber combat, if they still exist. Padme might be amazed by the new political systems and how society has evolved in terms of equality.
One common theme is mentorship. Obi - Wan is often portrayed as a mentor figure to Ahsoka, much like he was to Anakin. For example, in many fanfics, he teaches her more advanced Jedi techniques or imparts wisdom about the Force.
Good character development is key. The fanfic should show how their relationship evolves over time. Maybe start from a professional relationship and develop into a deeper, more personal one. It could also explore their different backgrounds and how that affects their interactions.
There's the theme of trust. In a lot of Anakin and Obi - Wan fanfic, their trust in each other is either strengthened or tested. Another theme is the idea of destiny. How Anakin's destiny as the Chosen One and Obi - Wan's role in it are explored. And the theme of sacrifice. Fanfics might show how they are willing to sacrifice for each other, which is a big part of their relationship.
The theme of redemption also pops up sometimes, even in Sith Obi - Wan fanfic. There may be a glimmer of hope that he could return to the light side. And of course, there's the theme of the Force. How does his new - found Sith connection to the Force change his perception and abilities? Writers often play with this idea in these fanfics.