It could affect the plot by making Naruto more cautious. Since he can see ghosts, he might be constantly on edge, not knowing if a new ghost is a friendly one or a threat. This could lead to him making different decisions in battles or in his interactions with other characters. He might also try to avoid certain places where there are a lot of ghosts, which could change the course of his adventures.
Well, it could make the plot more complex. For example, he might discover secrets that others can't. Maybe he'll find out some hidden pasts of the village or certain characters. Ghosts could lead him to new quests or help him understand some old mysteries better.
One important ghost could be the previous Hokages. They have a lot of knowledge and wisdom about the village and its secrets. Naruto seeing them could be a way for him to get some really valuable advice on how to deal with the current threats to the village, like a new powerful enemy or internal political issues.
It might change his relationships. He could communicate with the ghosts of fallen comrades or enemies. This would give him a unique perspective. Maybe he could understand the motives of former villains better and find ways to prevent future conflicts. Also, it could make his bonds with his living friends even stronger as he shares what he learns from the ghosts.
Well, it could make the plot more complex. For example, he might be able to see the souls of the enemies before they attack, thus getting an advantage in battles. He could also use this ability to communicate with the spirits of the dead ninjas and gain some unique knowledge or skills from them.
There could be the ghost of the First Hokage. He might have some important wisdom to pass on to Naruto. Maybe the ghost of a fallen comrade who has some unfinished business or a message for Naruto.
Naruto's ability to see the dead would be a game - changer in his relationships. It would add a new layer of complexity. Some villagers who already had a negative view of him might use this as more fuel for their dislike. But his true friends would support him. Naruto could communicate with the dead shinobi and learn from their experiences. This new knowledge could be shared with his comrades, making him an even more valuable asset to the group and deepening their relationships.
Well, it could make some characters view him as strange or special. His friends might be curious and a bit wary at first. For example, Sasuke might be initially skeptical but later come to rely on Naruto's unique ability in some situations. And Sakura could be both scared and intrigued, which would add new layers to their friendship dynamics.
Naruto's future - seeing ability could completely shift the power balance in the story. He could use it to find out where all the powerful artifacts or secret techniques are hidden in the future. For instance, if he saw the location of the Sage of Six Paths' hidden power, he could get there first and gain that power. This would put him in a much stronger position than his opponents, and might even change the political situation in the ninja world as different villages would react to his new - found strength.
I recommend the book Guide to the Night Return to you. The male protagonist gained the ability to attract evil people in an accident. Every night, there are all kinds of bad people following him. Although you can't directly see ghosts or borrow ghosts, this ability is similar to the special ability of having ghosts as companions. I hope you like it.
Naruto's ability to see the future in fanfiction can really mess with his relationships. He could see a future where his friends die because of his actions. This would make him question his place among them and might lead to him isolating himself. With his family, like if he has a future vision about his kids, he might be overly strict or try to control their lives too much to prevent the bad things he saw from happening. And with his teacher, like Kakashi, if he sees a future where Kakashi is in danger, he may act impulsively to save him, which could cause problems in their normal teacher - student dynamic.