One possibility is that he is lured by the power promised by the dark side. Maybe he gets frustrated with the slow progress of the light side in fighting the Empire and thinks the dark side can offer a quicker solution to end the tyranny. He could then start using dark side powers like Force lightning and become a feared figure, turning against his former friends.
Well, in a fanfiction scenario where Ezra Bridger joins the dark side, it might start with a great personal loss. For example, if he fails to save someone important like Kanan. This could lead to his anger and resentment. The dark side could prey on these emotions. He might be manipulated by a powerful dark side user who convinces him that the dark side can give him the strength to prevent further losses. As a result, he'd abandon the Jedi teachings and embrace the dark. Then he'd be involved in battles against the Rebellion, causing chaos and heartbreak among his former allies.
In this fanfiction, it could be that Ezra is deceived by a powerful dark side figure. He might start to believe that the Jedi way has failed him and that the dark side can provide a more effective means to achieve his goals. This could lead him to make choices that gradually draw him deeper into the dark side, like using dark side powers and distancing himself from his former Jedi allies.
Ezra could be lured by a Sith artifact. It emits a strong dark side energy that begins to influence his thoughts. He starts to question the Jedi ways he has been learning, thinking that the quick power of the dark side might be better. But his loyalty to his friends in the Rebellion holds him back from fully embracing it at first.
One idea could be Ezra being tempted by a powerful dark side artifact. Maybe he stumbles upon an ancient Sith holocron that shows him visions of great power and the ability to restore his lost home and people. This gradually pulls him towards the dark side as he starts to believe that only through the dark side's power can he achieve his noble goals.
One possible fanfiction could be about Ezra Bridger's struggle against the allure of the dark side. Maybe he has a vision of great power that could be his if he turns, but he remembers his friends and the teachings of the Jedi. He battles internally, with the dark side whispering temptations in his ear.
Well, one possibility is that she gets frustrated with the slow progress of the 'good side'. Maybe she sees all the bureaucracy and inefficiency in the fight against the dark forces and decides that the dark side can offer a more direct way to achieve her goals, like a more efficient magical society. But this would be a huge shift from her original character.
In the fanfiction, Luke could be influenced by his family ties to the dark side. If he discovers some hidden connection to Vader or Palpatine that he didn't know before, it might make him question his place on the light side. He could think that joining the dark side is a way to understand his true heritage better and gain more power to protect those he loves in a different way than the Jedi would allow.
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.
Perhaps a powerful dark side cult leader. They could manipulate Ezra into believing that their way is the right one and that the dark side is a misunderstood power. The cult leader might use Ezra's own insecurities and desires to draw him into the dark side.
Ezra would become more ruthless. His once kind and empathetic nature would be replaced with a cold, calculating demeanor. For example, he might not hesitate to sacrifice innocent lives if it served his purpose. His relationships would also change drastically. His friends would become either obstacles to be removed or pawns to be used.
One possible plot could be that Luke is lured by the power the dark side offers. Maybe he gets frustrated with the slow progress of the light side in bringing order to the galaxy. He might see the Sith as more efficient in getting things done. For example, if the Republic is still facing numerous threats and the Jedi are tied by their code not to take extreme measures, Luke could be tempted to cross over.