Well, one character that frequently shows up is Anakin Skywalker, or Darth Vader as he becomes. Their master - apprentice relationship is ripe for exploration in a dark Ahsoka scenario. Also, characters like Palpatine are common. He might be the one tempting Ahsoka further into the dark side or trying to manipulate her for his own purposes.
In this type of fanfiction, Barriss Offee can be a commonly featured character. Since they had a complex relationship in the official Star Wars lore, it can be further developed in the context of Ahsoka's dark turn. Additionally, some fanfictions might include other Jedi who have to deal with Ahsoka's fall, such as Obi - Wan Kenobi. He could be portrayed as either trying to save her or being forced to oppose her.
Darth Vader is often featured. Given their past connection, it creates a very interesting dynamic in the fanfiction. Another character could be Maul. His own complex relationship with the dark side can interact in various ways with Ahsoka's journey into darkness.
Sabine Wren is often featured alongside Ahsoka. Sabine is a Mandalorian warrior with her own set of skills and a complex personality. She and Ahsoka can have great interactions, whether it's in combat or during strategic planning. Another common character is Ezra Bridger. He has his own connection to the Force and his adventures often cross paths with Ahsoka's, creating interesting storylines.
One possibility in fanfiction could be that Ahsoka is tricked into the Dark Side. Maybe an old enemy manipulates events to make her feel betrayed by the Jedi Order. This could lead her to explore the power of the Dark Side, believing it to be a way to seek justice on her own terms.
One possible story could be that Ahsoka, after facing a series of great losses and betrayals, starts to be tempted by the Dark Side. Maybe she discovers some ancient Sith knowledge that makes her question her Jedi teachings. She could struggle with the newfound power it offers and the darker emotions it stirs within her, like anger and vengeance.
Ezra Bridger is also often paired with Ahsoka. Given their connection through the Force and their shared goal of fighting the Empire. They can have some really great moments of learning from each other. Ezra can learn from Ahsoka's wisdom and experience, while Ahsoka can be inspired by Ezra's fresh perspective and determination.
Anakin Skywalker is very common. As Ahsoka's master, he would have a big role in her trial. He might be torn between believing in her and following the Jedi Council's lead. Obi - Wan Kenobi is also often involved. He usually tries to be the voice of reason and fairness. The Jedi Council members are frequently present as well, like Mace Windu. They are the ones bringing the charges or presiding over the trial. And then there's Rex. He's Ahsoka's friend and ally, and he would most likely be on her side, providing support and maybe even helping to find evidence to clear her name.
For Anakin (if he's still alive in the fanfiction's context), it would be an emotional reunion. Their relationship has always been complex, and her return could either heal old wounds or create new tensions depending on how he has changed in her absence.
One popular theme is the exploration of the dark side's allure for Ahsoka. It might show her struggling with her own darker impulses, like anger or a thirst for power. Another theme could be her isolation as she delves into the darker aspects of the Force, being shunned by her former allies.
She might be tempted by the Dark Side if she discovers a hidden truth about the Jedi Order that she can't accept. So she turns to the Dark Side thinking it's a better alternative. For instance, if she finds out that the Jedi have been hiding some dark secrets about the Force, it could push her over the edge.
Ahsoka might be exiled from the Jedi Order for reasons she doesn't fully understand. In her solitude, she meets a mysterious figure who has ties to the Dark Side. This figure begins to teach her alternative ways of using the Force that are more in line with the Dark Side. Ahsoka, feeling betrayed by the Jedi, starts to consider these new teachings.
One great 'Star Wars Ahsoka' fanfiction is 'Ahsoka's New Path'. It explores her life after leaving the Jedi Order in a really interesting way. The author delves deep into her character, showing her growth and how she copes with the new challenges outside the Order.