Kakashi, being the more experienced and level - headed one, would probably analyze the situation carefully. He would study the details of the future shown in the fanfiction. He might use it as a warning or a guide. He could start making plans in case the future events seemed negative, and also try to figure out if there were any positive opportunities that could be exploited from what he saw.
Some characters might be shocked. For example, Naruto himself. He has always been full of hope for the future and worked hard to build a better world. If he saw a future that was not as positive as he expected, he would be very disappointed at first. But then he would surely try to find a way to change it, because that's his nature.
They might be shocked. For example, Ruby could be amazed by how her skills develop in the future depicted in the fanfiction. She might see herself using new techniques and facing different challenges, which would make her eager to train more to reach that level.
In Naruto future reaction fanfiction, characters might react to various things. For example, they could react to new jutsu developed in the future. They might be amazed at the power and creativity behind it. Maybe Naruto himself would be excited to see how the next generation has advanced the art of ninjutsu.
They would probably be shocked. For example, Naruto might be amazed to see how the village develops further. He could be excited to see new generations of ninjas and the peace that his efforts have led to in the future. Sasuke might be more reserved in his reaction, but he would also be interested in seeing if his own actions had a long - term impact on the ninja world.
Sasuke could have a really unexpected reaction. If the fanfiction portrays a future where he and Naruto have a very different relationship than he expected, he could be completely thrown off. He might start to question his own actions and decisions. Also, Tsunade's reaction could be quite a shocker. If the fanfiction has her in a situation where she has to give up her position as Hokage in a way she didn't anticipate, she might get really angry at first but then start to consider the implications for the future of the village.
They might be amused. Since fanfiction often takes the original story in new and unexpected directions. For example, if a character like Peter Parker's friend Ned was watching Spiderman fanfiction, he might laugh at the creative interpretations of Spiderman's adventures.
They might be surprised at how creative the fans are. Some characters could be amused by the different interpretations of their personalities and the events in Endgame. For example, if Iron Man's character reads a fanfiction where he has a different ending in Endgame, he might find it interesting to see how fans envisioned an alternative scenario for him.
They might be amused. For example, if the fanfiction has a humorous take on the Transformers, the characters could find it funny to see how fans perceive them. They might also be confused if the fanfiction takes the story in a very strange or unexpected direction that doesn't match their own experiences in the original Transformers universe.
The Avengers would have a range of reactions. Natasha Romanoff might analyze the characters in the Naruto fanfiction like she does with her targets. She'd look for their strengths and weaknesses. Bruce Banner, when not in Hulk mode, would be interested in the scientific aspects of the Naruto world if they were mentioned in the fanfiction. Clint Barton would probably just be along for the ride, laughing at the more comical parts and enjoying the break from all the superhero stuff.
Some characters might be shocked. For example, if a heroic character sees a fanfiction where they turn evil in the future, they would be very surprised. They might start to question their own actions and whether there are any signs that could lead to such a change.
He might be really surprised. Since he's used to his own real - life adventures, seeing different interpretations in fanfiction - based anime could be quite a shock. For example, if the fanfiction shows a different version of his relationship with Sasuke, he would be taken aback.