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.
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 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.
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.
Perhaps Ezra is injured in a trap set by an Inquisitor. His injury not only affects his physical abilities but also his confidence. His friends, like Kanan, would have to help him regain his trust in himself and the Force. They might go on a journey to find a special healer or an ancient Jedi relic that could aid in his recovery, all while being pursued by the Empire.
One idea could be to explore how Ezra's relationships change if she were a girl. For example, her friendship with Kanan might have different dynamics, perhaps more of a protective big - brother - like bond. Also, her interactions with Sabine could be more sisterly, with them sharing girl - talk about things like the latest Imperial fashion trends they hate or cool new rebel gear they want to get their hands on.
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.
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.
Well, that's a matter of personal opinion. Just because someone might think Ezra is stupid in fanfiction doesn't mean it's a universal view. In the official Star Wars Rebels story, Ezra has his own growth and development. However, in some fanfictions, the author might be trying to explore different aspects of his character or create unique storylines that could make him seem less intelligent, but it doesn't represent the whole view of Ezra's character.
Ezra being 12 in the fanfiction could lead to plots centered around his coming of age and facing challenges with a younger mindset. Maybe he has to prove himself despite his age.
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.