Naruto could be initially confused. Since fanfics often deviate from the 'official' story, he might not understand some of the strange plot twists or characterizations at first. But then, he might get really into it, especially if the fanfic shows his friends in a positive light or gives him new ways to think about his goals.
Naruto would probably have a range of reactions. At first, he'd be curious. As he reads on, if he comes across a fanfic that accurately captures the spirit of his world and his relationships, he'd be happy and maybe a bit flattered. However, if he reads something that distorts his values or misrepresents his friends, he might get angry or disappointed. He's a passionate character, so his reactions would be strong depending on the content of the fanfic.
He might be surprised. Fanfics can be full of wild ideas that he never thought of, like strange pairings or new jutsu concepts.
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.
Sasuke could be intrigued. If he comes across a well - written fanfic that really captures the essence of his relationship with Naruto or offers a new perspective on his goals and journey, he might get drawn into it. He might start to think about how these different ideas could fit into his own understanding of his life and the world around him. For instance, if a fanfic shows him a different path he could have taken, it might make him reflect on his choices.
He would probably be shocked. The fanfic might have some very different takes on combat and characters that he's not used to.
They may find it funny. There are often humorous fanfictions that could make them laugh.
He might be entertained. The abridged versions often have humor and can make light of serious situations in the original Naruto story.
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.