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.
It's possible that Naruto would talk to the ghosts of the Uchiha clan members. Given the complex history of the Uchiha and Sasuke's importance in Naruto's life, communicating with these ghosts could help Naruto understand the clan better. He might also be able to prevent further tragedies related to the Uchiha by learning from their past mistakes.
One of the most interesting could be the ghost of the First Hokage. He has so much knowledge about the founding of the village and the early days of the ninja world. Naruto could learn a great deal from him, like how to better lead and protect the village.
If Naruto can talk to ghosts in the fanfic, it could open up a whole new world of adventures. He could befriend some friendly ghosts who guide him to mysterious places in the ninja world. On the other hand, there might be evil ghosts that try to mislead him or use him for their own dark purposes. Naruto would have to learn to distinguish between good and bad ghosts and deal with the challenges that come with this unique ability.
One interesting story could be about Harry using his ability to talk to ghosts to solve a mystery in Hogwarts that has been long forgotten. Maybe a ghost has some crucial information about a hidden treasure or a secret passage.
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.
I think Mewtwo would be the most fascinating for Naruto to talk to. Mewtwo is a very intelligent and powerful Pokemon. It has complex thoughts about its existence and purpose. Naruto, with his own struggles and growth in the ninja world, could have deep philosophical discussions with Mewtwo. They could exchange ideas about power, identity, and what it means to be different in their respective worlds.
It could be the ghosts of the First Hokage and his comrades. They might have some unfinished business in the ninja world and see Naruto as the key to fulfilling it. So they raise him to be a great ninja with their ancient wisdom.
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 change the plot in many ways. For example, he might get some crucial information from the dead. Maybe he could learn some long - lost jutsu from a dead ninja master, which would make him stronger and help him in battles. Also, he could get some secrets about the Akatsuki's plans from their deceased members, which would give Konoha an advantage.