There might be an old sage - like character who has a vast store of memories and uses them to mentor the younger characters in dealing with the future. They could provide wisdom based on past events and how they might repeat or change in the future.
It's possible that there is a group of friends or comrades. Each of them might have different types of memories, some positive, some negative, and together they are trying to navigate the future. Their interactions and the way their memories clash or complement each other could be a central part of the story.
Sakura might also be a main character. In the original series, she is part of Naruto and Sasuke's group. Her skills as a medical ninja could be crucial in a story that involves future memories. Maybe Naruto's future memories show a situation where Sakura's medical skills are the key to saving someone important. Additionally, Kakashi could be in it too. His experience and wisdom could help Naruto make sense of his future memories and figure out what actions to take.
There's no way to know precisely without reading the 'watching the future fanfic'. But generally, there could be a group of friends or comrades who are facing the challenges of the future together. One of them could be a leader - type character with strong leadership skills. There might also be antagonists, perhaps those who want to control the future for their own selfish gains or those who oppose the positive changes that the main characters are trying to bring about.
The main characters would likely include Ichigo, as he is the protagonist of the original series. He might be facing new challenges in this future scenario. Renji could also be a main character, as his relationship with Rukia and his own growth arc make him an important part of the Bleach universe. And Aizen, even though he was a villain, could play a significant role if the fanfiction explores his possible return or his influence on the future events.
Obviously, Luffy would be one of the main characters. He's the captain of the Straw Hats and the central figure in the One Piece world. His actions and decisions would greatly influence any future scenarios.
Obviously, Natsu would be one of the main characters. He's always at the center of things in Fairy Tail, and seeing the future would surely lead him into some wild adventures.
One interesting concept could be how past memories shape the perception of the future in the fanfiction. Maybe characters use their past experiences, both good and bad, as a guide to face what's coming.
Well, it's likely that Eren would still be one of the main characters. After all, he's a central figure in the original 'Attack on Titan' story. He might be the one most affected by seeing the future and could play a crucial role in trying to change it.
I'm not sure specifically as it depends on the fanfic. It could be new characters created by the fanfic author who are descendants of the well - known Star Wars characters. For example, a grandchild of Luke Skywalker might be a main character, carrying on the Skywalker legacy in new ways.
Jon Snow is often a popular character. His mysterious origin and heroic nature make him a great focal point in fanfiction. He could be given new adventures or relationships in the future - themed stories. Daenerys Targaryen is also popular. Fans might explore what she would do if she had knowledge of the future, like avoiding some of the mistakes that led to her downfall in the original series. Another popular one is Tyrion Lannister. His wit and intelligence can be further explored in the context of future events in Westeros.
I think Weiss could also be central. She comes from a powerful family and has a lot of influence. In a story about watching the future, her knowledge of politics and her strategic thinking could play a big role. Also, her relationship with the other characters, especially Ruby, would be important in how they all react to what they see in the future. Blake might also be central as she has her own complex backstory and her views on the relationship between humans and Faunus could be greatly affected by seeing the future.