For Naruto's friends like Shikamaru and Choji, they would be quite surprised. Naruto might start to act more like Tobirama in some ways, which could be a bit off - putting at first. He could be more strict or more focused on the long - term goals of the village. This might cause some friction in their friendships until they understand what's going on. With the elders of the village, Naruto could gain more respect as Tobirama was a highly respected figure. But it could also make some of them wary, as they might fear Naruto using Tobirama's knowledge in ways they don't like.
His relationship with the younger generation of ninja would also be impacted. Naruto has always been a role model for them. But as Tobirama's reincarnation, he could become more of a mentor figure. He might start teaching them things in a more traditional, Tobirama - like way. This could inspire some of the younger ninja to study more about the village's history. However, some of the more rebellious ones might resist this new Naruto, thinking he's become too old - fashioned.
As for his relationship with the villagers, some might fear him more because of his connection to Indra. They could see him as a potential threat, like they did in the beginning when they were afraid of the Nine - Tails within him. However, others might see it as a sign of Naruto's importance and start to respect him even more, believing that he is destined for great things because of this reincarnation.
Well, Naruto's relationship with Hinata could be affected in several ways. If Naruto is reincarnated as Kaguya, Hinata might feel a bit distanced from him at first. She would be confused about this new side of Naruto. Also, the other villagers might start to fear Naruto, which could put a strain on his relationship with the whole village. But if Naruto can prove that he's still the same person deep down, he might be able to repair those relationships. His relationship with Kakashi would also change. Kakashi, being a knowledgeable person, would try to guide Naruto through this new development.
In fanfiction, anything is possible. So, Naruto could be Tobirama's reincarnation. Some fanfic authors like to play with the idea of reincarnation to bring new elements to the story. They might make Naruto inherit some of Tobirama's chakra nature or jutsu. This can create unique scenarios where Naruto has to deal with the memories or expectations that come with being Tobirama's reincarnation. It can also change the dynamics between Naruto and other characters, like Sasuke, as they might view Naruto differently if he has such a connection to an important figure from the past.
It could strengthen his relationships. His friends might be in awe of his new power and support him more. For example, Sasuke could see Naruto's black lightning as a sign of his growth and respect him even more, leading to a deeper bond between them.
One implication could be a change in Naruto's abilities. He might gain some of Tobirama's water - based jutsu or his talent for creating complex ninja techniques. Another is in his relationships. The village elders might treat him differently, perhaps with more respect or suspicion depending on their views of Tobirama.
Well, Naruto might show similar determination as Tobirama. Tobirama was highly determined in building the village and its systems. Naruto could be shown in the fanfiction to have that same unwavering resolve when it comes to protecting the village and making important decisions for its future.
His relationship with Sasuke could change significantly. With the new power from the merge, Naruto might be seen as more of a threat by Sasuke, or Sasuke could be jealous of Naruto's newfound strength. On the other hand, it could also lead to Sasuke respecting Naruto more and seeing him as an equal in a different way.
His illiteracy might make his friends initially frustrated. For instance, Sasuke, who is more studious, could be impatient with Naruto's inability to read important messages. But as they grow, they might become more understanding.
With Sasuke, it could either drive a wedge or bring them closer. If Sasuke blames himself for Naruto getting injured while protecting him, he might distance himself out of guilt. On the other hand, it could also make Sasuke realize how much Naruto means to him and he could become more committed to their friendship.
His apathy can strain his relationships. His friends might feel neglected. For instance, Sakura could be confused and hurt as Naruto no longer shows the same eagerness to be part of the team.