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.
One interesting fanfiction could be 'Naruto's Vision of Tomorrow'. In this story, Naruto starts having strange dreams that turn out to be visions of the future. It shows how he struggles to understand and change the events he foresees. Another great one is 'Future Sight: Naruto's New Path' where his ability to see the future makes him question his every decision in the present. And there's also 'Naruto and the Prophecy of the Future' which delves into how Naruto uses his new - found power to protect the village from threats that he anticipates.
One possibility could be that in the fanfiction, Kushina and Minato see Naruto becoming a great Hokage, respected far and wide. They might see him bringing peace to the village and forging strong alliances with other nations. This would make them extremely proud as they watch from whatever afterlife or special visionary state they are in.
One possible plot twist could be that Naruto sees a future where his friends turn against him. This would shatter his world as he values his friendships deeply. He might then struggle to figure out what went wrong in the future and try to prevent it in the present.
If Naruto sees the future, his relationship with Sasuke could change drastically. For example, if he sees Sasuke in danger in the future, he might become overly protective in the present, which could annoy Sasuke at first but also strengthen their bond in the long run.
Another problem is that seeing the future doesn't always mean he can change it easily. He might see a friend die in the future, but despite his efforts, the events still unfold as he saw them. This could be really frustrating and might even make him doubt his ability. Also, if too many people find out about his ability, some might try to use him or control him for their own purposes.
One idea could be Naruto seeing a future where the Hidden Leaf Village is in ruins due to a new, powerful enemy. He then spends his present time training harder and forging new alliances to prevent this future. Another plot could involve him seeing his friends in danger in the future, so he starts to teach them new jutsus in the present to better protect themselves.
In fanfic, the Naruto Orb's future - seeing ability can be portrayed in various ways. It could show hazy visions that are open to interpretation, like a blurry image of a battle with only a few recognizable elements. This makes the characters have to work hard to figure out what the vision means.
There's also 'Harry Potter and the Future's Secrets'. Here, Harry starts seeing the future after a strange encounter in the Forbidden Forest. The story focuses on how he uses these future - seeing moments to protect his friends and outwit his enemies. It has some great plot twists and really delves into the relationships between the characters in the face of this new power.