Some might become more self - aware. If the fanfiction highlights certain aspects of their personalities or actions in a new light, they could start to reflect on themselves. For instance, if a character is always seen as a sidekick in the show but in the fanfiction is the hero, it could make them re - evaluate their role.
On the other hand, they might become more defensive. If the fanfiction portrays them in a negative light, they could double down on their existing behaviors and beliefs to prove that the fanfiction's view of them is wrong. For example, a character who is made out to be a coward in the fanfiction could become more aggressive in their actions in the show to show that they are not what the fanfiction says they are.
They could get inspired. Maybe the fanfiction has a different take on their relationships or their goals. A character who was previously focused on just one thing in the show might see a new way of doing things in the fanfiction and be motivated to change their approach in their 'real' Breaking Bad world.
Some characters might start to question their own actions. For example, if they read a fanfiction that presents a different moral view of their decisions in Endgame, it could make them rethink what they did. Hulk might read a fanfiction where his decision to merge with Banner is presented in a negative light, and it could make him wonder if he made the right choice.
They might start to see new possibilities for themselves. If the fanfiction shows a character achieving something they hadn't thought of in the original story, it could inspire them to think they can do more.
Ichigo might gain new perspectives on his own power. If the fanfiction shows him in situations where he has to overcome even greater challenges, he could start to think about his own limits differently and maybe strive to be even stronger.
Harry might gain a new perspective on his own heroism. He could see how others view him as this super - heroic figure and might feel a bit pressured to live up to those expectations even more. Or he could also realize that he doesn't have to be this perfect hero all the time as the fanfiction might have some versions of him that are more flawed.
If Walter goes back in time, his relationship with Skyler would be completely different. Instead of lying to her about his meth - making activities, he would be honest and they could build a more trusting relationship. They might even have a normal family life without all the secrecy and danger.
A heroic character might become more determined to protect their world. After seeing the horror in The Purge, they would double down on their efforts to keep their own society safe and just.
Some characters might become more open - minded. If they are used to the traditional Cinderella story, seeing the different interpretations in the fanfiction could make them realize that there are many ways to tell a story. For instance, a character who always thought Cinderella was just a damsel in distress might see her as a strong, independent figure in the fanfiction.
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.
Some would be shocked. Take Nancy, for instance. If she saw fanfiction that delved into her romantic relationships in new and unexpected ways, she might be taken aback. She's used to her story being told a certain way in the show, and this new take would be quite different.
If they watch positive future fanfiction, they may gain more confidence. For instance, if a character sees themselves becoming a great leader in the fanfiction, they might start to believe in their leadership potential more. It could inspire them to work towards that in their own story.