Well, in Darth Vader and Ahsoka fanfiction, the dynamic between them can be really interesting. Ahsoka knew Anakin, and now facing Darth Vader, she has this internal struggle. Fanfic writers may show how she grapples with the fact that the person she once looked up to is now a Sith. And Vader, he may have some remnants of his feelings for Ahsoka from his Anakin days, which could lead to some very emotional and action - packed scenes in the fanfiction.
Yes, there are likely some fanfics with this concept. Fanfic writers often explore unique and alternative storylines. They might be interested in exploring what would happen if Ahsoka, who was Anakin Skywalker's apprentice, ended up in a situation where she worked for Darth Vader (Anakin's Sith persona). It could involve complex character dynamics and a re - imagining of the Star Wars universe.
One common theme is redemption. Writers often explore the idea of Darth Vader being redeemed through his connection with Ahsoka. Another theme is the struggle between the light and dark side, as Ahsoka represents the light and Vader the dark. Also, the theme of broken relationships is present, given their past as master - apprentice.
One possible storyline could be a scenario where Ahsoka Tano and Darth Vader cross paths during a mission on a neutral planet. Ahsoka, still holding onto her Jedi beliefs, tries to reach out to the conflicted Anakin within Vader. This could lead to intense lightsaber duels and deep, emotional exchanges as they both struggle with their past relationship and the current state of the galaxy.
In such a fanfic, Ahsoka could be in a very difficult position. Her loyalty would be divided between her sense of right and wrong and her obligation to Vader. She may find herself in situations where she has to make difficult choices. For example, if Vader orders her to kill an innocent or fight against a former ally. This could lead to her growth as a character, either towards the dark side if she succumbs to the pressure, or towards a stronger form of her Jedi self if she resists. Also, the relationship between her and Vader would be complex and full of tension, with power dynamics constantly shifting as they both try to gain the upper hand in their own ways.
Luke Skywalker could be another key character. Since he is Vader's son, his presence could add an interesting dynamic. He might be the one who somehow triggers the battle between Anakin and Vader, or he could be in a position to influence the outcome of their fight, perhaps by appealing to the remaining good in Anakin or by facing off against Vader himself in a three - way struggle.
It really depends on how you write it. If it's Anakin at his peak before turning to the dark side, he has a lot of raw power and potential. But Vader has years of experience as a Sith Lord. So, it could go either way.
In some fanfictions, their relationship develops through a series of battles. Each encounter makes them more aware of the other's strength and weaknesses. For example, Vader might initially see Ahsoka as a mere nuisance but as they fight more, he starts to respect her skills, which in turn makes him question his own choices more deeply. And Ahsoka, she begins to understand the depth of Vader's fall and feels a sense of sorrow for him.
One scenario could be that Darth Vader discovers Ahsoka is still alive and is conflicted between his Sith loyalty and his past connection with her. He might secretly try to protect her from other threats in the Empire without revealing his identity.
Darth Vader could encounter advanced droids that have developed personalities and even some form of Force - like abilities in this future. These droids might be a new challenge for him as they are not like the droids he is used to dealing with in his own time. He may also meet future versions of his former allies or enemies, who have been reincarnated or cloned in some strange new way, with different personalities but still with a connection to their past selves.