Without having read 'reading the future fanfic', it's impossible to know exactly who the main characters are. But if we think about common fanfic tropes, it could be a hero - type character who uses the future - reading ability to save the day. There might also be a mentor figure who helps them understand and control their power. And of course, there could be an antagonist who either tries to stop the future - reading or wants to use it for their own evil purposes.
Since I don't have specific details about this 'reading the future fanfic', it's hard to say who the main characters are. It could be the ones who have the power to read the future, or it might be the people around them who are affected by this ability.
Most likely Eren would be one of the main characters as he is central to the original 'Shingeki no Kyojin' story. If the fanfic is about reading the future, his actions are often crucial in determining the fate of humanity, so he would be a prime candidate to have this ability or be affected by someone who does.
The main characters in 'children of the future fanfic' could be children from different social backgrounds. For instance, there might be a poor orphan who discovers he has the ability to control time, and a rich kid who uses his family's advanced technology to help the group. There could also be a young scientist - in - training who is trying to figure out the secrets of the future world and is leading the other children in their adventures.
Since I haven't read the fanfic, I can't say for sure. It could be original characters created by the fanfic author, or it might feature characters from an existing franchise that the fanfic is based on.
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.
Most likely, Marty McFly would still be one of the main characters. He's the central figure in the original movies and would probably play a major role in the fanfic set in 2015. Doc Brown would also be there, as he's the inventor of the time - travel technology and Marty's mentor. There could also be Biff Tannen or his descendants, as they often cause trouble in the 'Back to the Future' universe.
Naruto would likely be excited yet a bit scared. He'd be eager to make the future a better place but also worried about the bad things he might see. Sasuke would probably be more reserved, analyzing the future information carefully. Hinata would be shy about it but also determined to protect those she loves if she saw any danger in the future for them.
One option for the main character could be the child of Jake Sully and Neytiri. This character would inherit the unique skills and knowledge of their parents and face new challenges in the ever - evolving world of Pandora.
Maybe a group of friends who form a gaming team. Each friend has a different specialty in the game, like one is great at combat, another at strategy, and one at finding hidden treasures. They work together to achieve victory in the game world.
Since I haven't read it, I can't say for sure. But likely, the members of Class 78 are the main characters. They could be students with different personalities, skills, and backstories that play important roles in how they interact with the vision of the future.
In a 'naruto future orb fanfic', the main characters might be a group of young and inexperienced ninjas who accidentally stumble upon the orb. They could include a headstrong male lead who is eager to prove himself, a smart female character who tries to figure out the orb's secrets, and a mentor - like figure who has some knowledge about the orb from the past. These characters would then embark on a journey filled with challenges and revelations related to the orb.