In many fanfictions, the relationship between Ezra and Maul is a slow - burn one. At first, Ezra is afraid of Maul, given his reputation as a dangerous Sith. But as Ezra matures in the Force, he begins to understand Maul's motives better. Maul, on the other hand, starts to see Ezra as a kindred spirit in a way, as they both are somewhat outcasts in the grand scheme of the Force - users. This mutual understanding leads to a relationship that is full of tension but also has elements of cooperation and even a strange sort of friendship.
As they work together more often, they might develop a friendship. For example, Ezra could teach Leia some of the more unorthodox ways of using the Force that he learned from Kanan, and Leia could introduce Ezra to the broader political landscape of the Rebellion. This exchange of knowledge would bring them closer.
One interesting story could be about Ezra and Maul teaming up unexpectedly against a greater threat in the Outer Rim. They have to put aside their differences and use their unique Force abilities to fight off a powerful Sith Lord who is trying to take over a crucial planet for the Rebellion.
Their relationship could develop as they train together. Ezra would learn more refined Jedi techniques from Ahsoka. This would create a deeper bond of respect and mentorship.
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.
Some fanfictions show their relationship evolving during times of crisis. When Ezra is in danger, Kanan goes to great lengths to save him. And when Kanan faces his own inner demons, Ezra is there to support him. These experiences outside of the normal rebel activities help them form a deeper, more complex relationship.
Their relationship often develops through shared battles. As they fight side by side, they start to trust each other more. This trust then turns into a deeper connection.
Writers often start with their existing relationship in the show. They then build on it by putting them in new situations. For example, in a dangerous rescue mission where they rely on each other more than ever. This deepens their bond.
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.
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.
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.