In addition to the main characters, characters like Shikamaru could be important. He's known for his intelligence and might be helping Naruto with strategic decisions in the future. Hinata could be there as Naruto's wife, and their children might also be part of the future Naruto witnesses. And of course, the tailed beasts would be significant as they are an integral part of Naruto's power and his connection to the ninja world.
Obviously Naruto himself is the most important as he's the one seeing the future. Sasuke would likely be there too, as he's Naruto's closest friend and rival. Sakura would probably also play a role, maybe as a skilled medical ninja in the future Naruto sees. Kakashi might also show up, perhaps as an elder guiding Naruto in his leadership role.
Naruto is the central character, no doubt. Hinata could be important as well. If Naruto sees a future related to his family or his relationship with Hinata, she will play a significant role. Additionally, the Hokage, like Tsunade or whoever is in charge at that time, would be important as Naruto may need to report the future he saw to the village leadership to take collective action.
Naruto might meet his future children. He would be able to see what kind of people they are and what their dreams and aspirations are. It would be an emotional moment for him, seeing his family in the future.
Obviously, Naruto himself is the most affected as he has to deal with the knowledge of the future. But his friends like Sasuke, Sakura, and Kakashi would also be deeply affected. If Naruto saw a future where Sasuke was in trouble, he would do everything to change it, which would impact Sasuke's life. Sakura, being Naruto's teammate and also caring about Sasuke, would be involved in any plan Naruto made. And Kakashi, as their sensei, would be there to guide and support them through the changes Naruto tries to make based on his future vision.
Sasuke is definitely one. Since Naruto already knows Sasuke's path in his previous life, he could change Sasuke's fate. Also, Kakashi. Naruto might interact with Kakashi differently, sharing his future knowledge which could impact Kakashi's decisions.
Iruka could play a role. He was Naruto's first teacher who believed in him. He might have some small piece of information that starts Naruto on his journey to find his parents. Then there's Tsunade. As the Hokage, she has access to a lot of secret files. She could either be an obstacle, not wanting Naruto to dig too deep, or she could be a helper, providing him with crucial information. And of course, the Nine - Tailed Fox. It was sealed inside Naruto by his father, so it might have some memories or knowledge related to Naruto's parents that it could share with Naruto.
Obviously, Naruto would be the main character since it's about his past seeing the future. Sasuke would also be important as Naruto's relationship with him is central to the Naruto series. Kakashi too, as he is Naruto's teacher and mentor, and his guidance might be influenced by Naruto's new - found knowledge of the future.
Well, in this fanfiction, Naruto might see himself as Hokage finally achieving all his dreams. He could see his friends and family thriving in a peaceful Konoha. Maybe he'd also see new generations of ninja being trained under his guidance.
The main characters are Naruto and his comrades. Iruka, Naruto's first teacher, could be in it too. He has always been like a father figure to Naruto. In the fanfiction, he might be one of the first to notice something strange about Naruto's future. Then there are Naruto's other friends from the village like Kiba and Choji. They would all react differently to seeing Naruto's future. Kiba might be more impulsive in his actions to change it, while Choji might be more cautious but still determined to help Naruto have a better future.
Another character could be Kakashi. As Naruto's former teacher, he has a lot of wisdom. When Naruto tells him about the future he's seen, Kakashi could offer strategic advice on how to prevent the negative events from occurring. He could also help Naruto understand the possible consequences of their actions to change the future.
Lucy could be a likely candidate. She is a Celestial Spirit mage, and there could be some connection between her magic and seeing the future through her spirits. For example, maybe one of her spirits has the power to grant her glimpses of the future. Another one could be Jellal. Given his complex backstory and powerful magic, it's possible that in fanfiction, he could develop or already have the ability to see the future as part of his evolution or redemption arc.