For the Soul Society, if the captains read fanfiction, it might disrupt their normal order. For instance, Byakuya might read a fanfiction that portrays his family in a different way. This could make him question some of his long - held beliefs about his clan. And if enough characters start believing in the fanfiction - inspired ideas, it could completely change the power dynamics and relationships in the Bleach world. The Quincy might also get involved if they notice the characters in Soul Society acting differently due to the influence of fanfiction.
The plot could change drastically. If Ichigo knows about future threats, he might take different actions in the present. For instance, he could start seeking out new training methods earlier or form alliances differently.
Rukia would probably be very critical at first. Since she is quite serious, she might nitpick the inaccuracies in the fanfiction. But she might also secretly enjoy the ones that show her in a positive light, like those highlighting her friendship with Ichigo. In the Bleach universe, characters are used to their own stories, and fanfiction would be a whole new and unexpected take on their lives. The zanpakuto spirits might also have interesting reactions if they could read, as they have their own personalities and might be offended or flattered by how they are depicted in the fanfictions.
Some characters might be amused. For example, Ichigo might find it interesting to see how fans imagine his adventures in different ways. He could chuckle at some of the more out - there scenarios.
They might be quite surprised. Some characters like Ichigo could be either amused or annoyed depending on how they are portrayed in the fanfiction. For example, if the fanfiction makes him seem weak when he sees himself as strong, he'd likely be irritated.
Ichigo might become more cautious. Usually he's quite impulsive, but seeing the future could make him think twice before acting. He doesn't want to mess things up more than they already might be in the future he saw.
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.
Well, some characters might try to change the future they read. For example, Ichigo might see a future where his friends are in danger and immediately start training harder to prevent it. He's always been the type to take action.
Naruto would probably befriend Ichigo right away. They both have a strong sense of justice and a desire to protect their friends. Sasuke, on the other hand, might be more aloof at first. He could be intrigued by Urahara Kisuke's mysterious nature. Naruto would likely get along well with Orihime too, as she has a kind heart. Sasuke might have a more competitive relationship with Byakuya, seeing his power and discipline.
If 'bleach' could read fanfiction, it's a really wild idea. Let's assume it's the 'Bleach' series. The original story has its own lore and rules. Fanfiction can sometimes go against those. If 'bleach' could read it, it might be shocked at how some fans rewrite character backstories or create entirely new relationships between characters. Maybe it would inspire new ideas within the official story if it was a sentient entity that could somehow communicate with the creators, but that's all just very imaginative speculation.
I'm not sure if 'bleach' in the sense of the chemical or the common household product can read fanfiction. But if you mean the anime/manga 'Bleach', it doesn't have the ability to read in the literal sense as it is a fictional creation. However, fans of 'Bleach' might read 'Bleach' - related fanfiction.