He might be entertained. The abridged versions often have humor and can make light of serious situations in the original Naruto story.
Naruto could have a range of reactions. At first, he might be really excited to see his story in a new way. But then, if the fanfiction took some big liberties with his character or the story, he could get a bit defensive. He might also find it really interesting to see how fans have interpreted different parts of his journey, like his training with Jiraiya. Overall, it would be a very mixed bag of emotions for him.
Well, he might be really confused at first. He'd see his own story but in a different, often more comical or condensed version. He might be amused by how some characters are portrayed, or he might be a bit offended if they made fun of him too much.
They may find it funny. There are often humorous fanfictions that could make them laugh.
Naruto would be thrilled. He loves being the center of attention and seeing all these stories about him would make him feel even more important. He'd probably want to meet the writers and tell them how cool he thinks their ideas are.
He might be really excited. Naruto loves new and exciting things, and the multiverse fanfiction would be full of that.
He would likely be very curious. Naruto has always been eager to learn and explore new things, so seeing future fanfiction would be like opening a door to a new world of possibilities for him.
He'd probably be shocked. His world is already full of surprises like different jutsus and powerful enemies, but the multiverse would be on a whole new level. He might not believe it at first and think it's some kind of elaborate prank or illusion.
They could have a range of reactions. Naruto would likely be excited and eager to see new stories about his world. He loves adventures and would be interested in seeing different takes on his life.
Naruto might react with a sense of responsibility. If he saw a future where Konoha was in danger, he would feel it was his duty to do something about it. He could start by gathering information from the future vision, like the weaknesses of the enemy. Then, he would share this knowledge with his comrades and come up with a plan to protect the village.
He might be surprised. Fanfics can be full of wild ideas that he never thought of, like strange pairings or new jutsu concepts.
Kakashi would be very observant. He would look for how the fanfiction writers understand the world of Naruto, the values and the moral lessons. He might even use some of the creative ideas from the fanfiction in his own teachings if he thought they were valuable and in line with the spirit of the original story.