Some characters might become closer if they share the same feelings about the fanfiction. For example, if two characters both find a certain part of the fanfiction hilarious, they could bond over that.
On the other hand, characters who have different views on the fanfiction could start to argue. Maybe one character likes how they are portrayed as a villain in the fanfiction because it gives them a new perspective, while another character thinks it's a misrepresentation and they get into a heated debate.
There could be some conflict. If one character likes a particular fanfiction and another character hates it, it might lead to an argument. Maybe a Decepticon likes a fanfiction that portrays the Decepticons as the good guys, but an Autobot disagrees strongly, and this could cause tension between them.
Darth Vader might start to question his loyalty to the Emperor after seeing his past self's actions in A New Hope. The relationship between the Rebel pilots could become more cohesive as they watch their comrades in the movie within the fanfiction succeed against the odds. The droids, like R2 - D2 and C - 3PO, would likely have their friendship reaffirmed as they see how they worked together in the movie. Yoda might start to see Luke in a new light, perhaps realizing his potential even more than before as he watches Luke's first steps in the movie within the fanfiction.
They could be shocked. Some of the fanfiction might have really wild ideas that they've never thought of.
Conversely, relationships could also be strained. If the fanfiction portrays a character in a way that another character doesn't like, such as making one character overly jealous or possessive of another in a way that goes against their normal dynamic, it could cause tension between them. For instance, if a fanfiction makes a brother - sister relationship seem romantic in a wrong way, it would create problems.
For characters like Princess Leia, her views might expand. She'd see different interpretations of her relationships, like with Han Solo or Luke Skywalker. Maybe she'd be surprised by some romantic fanfictions that she hadn't considered before.
Some relationships might be tested. If the fanfiction portrays one Avenger in a bad light or has a conflict between two of them that's different from what they know, there could be some tension. But they'd also realize it's just a fan's interpretation. Hawkeye might be a bit miffed if the fanfiction makes him seem less important, for instance.
Well, some relationships might become stronger. For example, Thor and Rocket might bond more over their shared experiences in Endgame. They could start to rely on each other even more in future battles.
The Avengers might start to see Iron Man in a new light. The fanfiction could highlight aspects of his character that they hadn't really considered before. This could lead to a deeper understanding and respect among them for Iron Man and also for each other as they discuss these new perspectives.
At first, she might be curious and excited to see different interpretations of the Naruto world.
Clark and Barry would likely start off as cautious allies. Clark, being more experienced in the superhero game in a sense, might initially be a bit of a mentor to Barry. But as they face challenges together, they'd become true friends. Lois Lane would probably be intrigued by Barry's speed and his different approach to reporting. She might even try to get some scoops from him. Meanwhile, Chloe Sullivan could help Cisco Ramon with some of his tech issues, and they'd form a bond over their shared love of all things tech - savvy.