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.
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.
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.
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.
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.
In addition to the famous ones like Nearly Headless Nick and Moaning Myrtle, there could be the ghosts of former Hogwarts professors. These ghosts could offer Harry unique insights into the history of Hogwarts and the magical arts. For example, the ghost of an old Potions master might give Harry some rare potion - making tips or warn him about a new danger lurking in the castle. Another possibility is the ghosts of students who died in some sort of magical accident long ago. They might be seeking Harry's help to resolve some unfinished business or find peace.
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 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.
Romance male protagonists who could see ghosts were usually people with special abilities or superpowers. This kind of plot often involved the male protagonist's contact and adventure with ghosts, and it was often accompanied by the support and help of the female protagonist. Such a plot would usually make the readers feel nervous and excited, and it would often trigger the readers to think about human nature and morality.
There was no clear conclusion as to whether seeing the Black and White Ghosts was a good thing or a bad thing. According to the legends, meeting the White Impermanence could bring good fortune, while meeting the Black Impermanence could bring disaster. However, these were just folk legends and were not supported by scientific evidence. Therefore, he couldn't be sure whether it was a good thing or a bad thing to see the Black and White Ghosts.
One possible plot could be that Mirabel discovers her ability to see ghosts after the events of Encanto. The ghosts could be the ancestors of the family who have unfinished business. For example, they might want to pass on a long - forgotten family secret to Mirabel that could help the family in some way.