If Cal fully turns to the dark side, he might start to see BD - 1 as a tool rather than a friend. He could become more cold and calculating, and BD - 1's presence might become more of an annoyance to him. He might even try to modify BD - 1 to better suit his new dark - side - inspired goals, which would be a huge change from their previous warm relationship.
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.
One possibility is that she becomes disillusioned with the Rebellion. Maybe she discovers some dark secrets within the Alliance that make her question their motives. For example, if she finds out that the Rebellion has been using unethical tactics in the fight against the Empire. This could push her towards the dark side as she feels betrayed by those she once trusted.
One possible reason could be extreme loss. If Cal were to lose all his friends and allies in a tragic way, he might feel so much pain and anger that it drives him towards the dark side. For example, if his newfound Jedi family was wiped out by the Empire, the grief could cloud his judgment and make him vulnerable to the dark side's temptations.
In a 'Harry Potter turns to the Dark Side' fanfiction, the plot might involve Harry being influenced by a powerful dark object. For example, a cursed artifact that makes him see the Dark Arts in a different light. He could start to believe that the ends justify the means and that the Dark Side has been misrepresented all along. As he delves deeper into the dark side, he begins to turn against his old friends, thinking they are too naive and weak to truly change the wizarding world.
One possible scenario could be that Luke is lured by the power promised by a powerful dark side figure. Maybe he's faced with a situation where he believes the dark side can save someone he loves, like if Leia was in mortal danger and the only way he thought he could save her was through dark side powers.
Palpatine could still be the main antagonist even if Luke turns to the dark side. He might try to use Luke as a more powerful weapon against any remaining Jedi or the Rebel Alliance. Palpatine would see Luke's newfound dark side power as a means to further his own control over the galaxy.
In fanfiction, if Ezra Bridger turns to the dark side, his character would experience a significant transformation. His once - noble Jedi - like qualities would be replaced by a more self - serving and power - hungry nature. His relationship with Sabine would become extremely complicated. Sabine might initially be in denial about his turn, thinking there's still good in him. But as time passes, she'd have to face the reality. If Sabine turns to the dark side, her Mandalorian values could be perverted. Her loyalty could shift from her friends to some dark power. And Ezra would have to decide whether to save her or stop her, which would be a huge internal struggle for him.
One possible trigger could be a sense of betrayal. If Ezra felt let down by his friends or mentors, it might push him towards the dark side. For example, if they didn't believe in him during a crucial mission or made decisions that he thought were wrong.
Some fanfictions explore Anakin's turn from the perspective of his friendship with Obi - Wan. Maybe there's a rift between them caused by outside forces, like a false accusation against Anakin that Obi - Wan doesn't fully believe him about. This slowly sours their relationship and Anakin, feeling abandoned by his friend, is more susceptible to the dark side's allure.