A fanfiction idea could be that Ezra, in his search for a way to defeat a great enemy, stumbles upon an ancient dark side temple. Inside, he is influenced by the dark side presence. His connection to the light side starts to fade. He becomes more aggressive and less empathetic, using his powers for his own gain rather than the greater good, and his relationships with his former allies become strained as a result.
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.
In a fanfiction, Ezra might be tricked into joining the dark side by a disguised dark side user. This person could pose as a friend in need, only to lead Ezra down a dark path. They could manipulate his insecurities and his desire to be a stronger Jedi.
In a fanfiction, Ezra could be exposed to a dark side cult. They convince him that the Dark Side offers a more efficient way to bring order to the galaxy. He then starts to use dark side techniques in his fighting and decision - making. His fall to the Dark Side could be a long and tragic process, with him losing his moral compass along the way.
Ezra could resist the dark side by relying on his strong bonds with his friends. Their loyalty and friendship act as a shield against the temptations. For instance, when he has moments of weakness and hears the dark side's whispers, he thinks about how his friends would be disappointed, and that gives him the strength to fight it.
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.
In a fanfic, Ezra could be manipulated by an old acquaintance who has already fallen to the dark side. This person could convince Ezra that the dark side offers a quicker way to end the Empire's tyranny. Ezra, being young and somewhat impulsive, might be swayed by this false promise, gradually embracing the dark side's teachings and powers.
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 could start to show signs of being drawn to the dark side through his growing anger. For example, if something bad happened to his friends and he couldn't save them, his anger could make him more susceptible to the dark side's influence.
It would change it a great deal. For starters, the relationship between Obi - Wan and Anakin would be completely flipped. Anakin might not have turned to the dark side as he did in the original story because Obi - Wan would not be there to oppose him in the same way. Also, the Jedi Order would be in even more chaos. With Obi - Wan's knowledge of the Jedi, he could easily help the Sith destroy them from within.
Luke might turn to the Dark Side if he experiences a great personal loss. Suppose his friends or family are killed and he blames the Jedi way for not being able to protect them. In his grief and anger, he could be lured by the power that the Dark Side offers. It gives him a false sense of control and the ability to seek revenge. Also, if he were to be exposed to powerful and alluring dark side artifacts or knowledge, it could corrupt his mind and make him question the teachings of the Jedi.