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.
The influence of a powerful dark side user who targeted her specifically. This user could manipulate her emotions, play on her insecurities and gradually turn her towards the dark side. They might offer her knowledge or power that she couldn't resist, slowly corrupting her view of the Force.
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.
She would become more ruthless. Instead of her usual calm and collected self, she'd be quick to anger and more likely to use force as a first option rather than a last resort. For example, she might not hesitate to harm innocents if they got in the way of her goals.
A possible plot could involve Ahsoka being betrayed by someone she trusts deeply within the Jedi or among her friends. This betrayal could be so severe that it pushes her over the edge, and she turns to the dark side for revenge. She then uses her newfound dark side powers to seek retribution against those who wronged her.
One interesting aspect of Dark Ahsoka Tano fanfiction is the exploration of her character's fall from the light side. It could involve her being influenced by dark forces, perhaps in a scenario where she feels betrayed by the Jedi Order. This might lead to her using her skills in a more ruthless way, different from her traditional Jedi self.
One possible plotline could be that Ahsoka feels betrayed by the Jedi Order. Maybe she discovers some dark secrets within the Order that make her lose faith in the light side. This could lead her to be lured by a powerful Sith Lord who offers her a new way of seeing things, and slowly she starts to embrace the Dark Side, using her skills in new and more aggressive ways.
If Ahsoka turns to the dark side, it would be a huge blow to the morale of those who still believe in the light side. She was a symbol of hope and a skilled Jedi, so her fall would make many question the strength of the light side. It could also lead to more chaos as she might use her skills to cause destruction or help the dark side in their plans.
She might start wearing darker colors. Instead of her usual white and orange, she could don black robes with red accents, symbolizing her new allegiance to the dark side.
Maybe Ahsoka gets captured by a dark side cult. They try to convert her by showing her their version of 'justice' through the dark side. They expose her to their cruel and efficient ways of dealing with enemies, which makes her question her Jedi teachings. However, she eventually realizes that their 'justice' is just tyranny in disguise.