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.
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.
One great Ezra and Sabine fanfic is 'Bonding on Lothal'. It really delves into their relationship during the Rebellion on Lothal. The author does an amazing job of showing how they rely on each other and grow together as characters.
A possibility is that Ezra as a girl would bring a new perspective to the team. Her character could be more empathetic and this could affect how the group makes decisions. For example, when dealing with civilians caught in the crossfire of the Rebellion - Empire battles, she might push for more rescue - oriented strategies.
In some fanfics, Sabine might kill Ezra due to a dark side influence. Maybe she's been corrupted by some dark power or Sith artifact that twists her mind, making her see Ezra as a threat to her goals or to the galaxy at large.
One great fanfiction could be where Sabine discovers Ezra in a long - forgotten Jedi temple. In this story, Sabine has been on a solo mission to explore ancient Jedi sites. By chance, she stumbles upon a hidden chamber where Ezra has been in some sort of stasis or exile. Their reunion is filled with a mix of emotions, from shock to overwhelming joy.
One possible scenario in an Ezra captured fanfiction could be that he's captured by an Inquisitor. This would put him in a tough position as he has to face the Inquisitor's cruel methods. His friends in the Rebels would then start a mission to save him. They might face various challenges and enemies along the way, and Ezra would have to hold on to his hope and his Jedi training while in captivity.
There are many great fanfics about Ezra and Sabine's love. Some focus on their gradual realization of feelings during their adventures in the Rebellion. For example, in some fanfics, their shared experiences fighting the Empire bring them closer and closer, and they start to have those little moments of blushing and stuttering around each other.
Ezra's bow rifle in fanfiction often becomes a symbol of his unique fighting style. It can be depicted as a weapon that he customizes over time. In some fanfictions, it might have hidden capabilities like the ability to fire different types of ammo, not just the regular bolts. This adds an element of surprise to his battles and makes him stand out among the other rebels.