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.
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 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.
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.
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.
She could be driven by a sense of betrayal. Maybe she discovers that the Jedi Order has been hiding something crucial from her, like a dark secret about her past or a false promise they made. This could shatter her trust in the light side and make her vulnerable to the temptations of the Dark Side.
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.
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.
It could be Darth Sidious. He is always looking for powerful allies. If he senses Ahsoka's potential and her growing disillusionment with the Jedi, he might manipulate her into joining the Dark Side. His cunning and power would make him a formidable antagonist in this scenario.
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.
She might start by becoming disillusioned with the Jedi Order. Maybe she discovers some secrets that make her question their ways. Then, she could be lured by the power the Dark Side offers, like Darth Vader was. She'd likely start using more aggressive and unethical tactics in combat and in her relationships.