Their relationship could develop in a hostile way at first. The Inquisitor is tasked with hunting Ezra, so he would be constantly on Ezra's tail, trying to capture or kill him. Ezra, in turn, would see the Inquisitor as a major threat and fight back with all his might.
A more complex storyline could be that the Inquisitor, who was once a Jedi himself, sees Ezra as a chance for redemption. He secretly tries to guide Ezra away from the path of the Rebellion, believing that the Jedi should stay out of galactic politics. This creates an internal struggle within Ezra as he has to decide whether to trust the Inquisitor or not.
One possible storyline could be Ezra's struggle with the dark side. He might initially be lured by the power that being an Inquisitor offers. For example, he could be tempted by the ability to defeat the Empire more effectively but at the cost of his own moral compass. Another could be his relationship with the other Inquisitors. He might be an outcast among them, as he was once a rebel. Or perhaps he tries to use his new position to secretly help the rebels, creating a complex web of double - agent - like situations.
Well, in a lot of Star Wars Rebels fanfic, Ezra being sick often serves as a catalyst for emotional moments. The other characters like Kanan or Sabine would be worried about him. It can also create some interesting dynamics within the group. Some might be overly protective, while others could be more focused on the mission but still concerned. And it might be a chance for Ezra to grow in his understanding of his friends' care for him while he's in a weakened state.
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.
His relationships would change drastically. His bond with Kanan would be severed, and instead, he'd form new alliances with the Inquisitors. However, these relationships would be based on power and fear rather than the friendship and mentorship he had in the Rebellion. He'd also be seen as a traitor by his old friends, which would add a layer of guilt and isolation to his character development.
In this fanfiction, Ezra could be on a mission and stumbles upon an ancient Mandalorian artifact. This artifact has some sort of connection to the Force, which draws Ezra in. As he delves deeper into the Mandalorian culture to understand the artifact, he uncovers secrets that not only change his perspective on the Mandalorians but also give him new powers or knowledge that he can use against the Empire. The story could explore how Ezra balances his newfound Mandalorian - influenced identity with his role as a rebel and a Force - user.
There could be a fanfiction where Ezra, from Star Wars Rebels, discovers the legacy of Revan. Maybe Ezra stumbles upon an ancient Jedi artifact that has a connection to Revan. He starts to have visions of Revan's battles and is inspired by his unique blend of light and dark side use, which could lead Ezra to question his own understanding of the Force.
One idea could be that Ezra is kidnapped by the Empire. They might want to use him as bait to lure the other rebels. The rebels then have to come up with a risky plan to rescue him. Maybe they get some unexpected help from an old acquaintance of Ezra's.