His relationship with the villagers would be a complex one. Some might still hold grudges against the Kyuubi, and thus be suspicious of Naruto as the successor. However, others who have come to know Naruto's true self, like Iruka, would support him. They would see that Naruto is not the Kyuubi but someone who has to bear this heavy burden, and they would stand by him through it.
Well, it could make some characters fear him. For example, those who don't understand the nature of his succession might be wary. But his friends, like Sasuke, might see it as just another aspect of Naruto. They've seen his determination before, and this new status could be seen as an extension of his power and the challenges he has to face.
When it comes to his relationship with the older generations, like the Third Hokage. They would be more cautious. They know the power of the Kyuubi and the potential danger if Naruto loses control. So they would be constantly monitoring him while also trying to guide him. This would put a strain on their relationship at times, but also a sense of responsibility on their part to ensure Naruto doesn't go astray.
He might gain enhanced physical strength. Since the Kyuubi is known for its great power, Naruto could have a boost in his melee combat abilities. For instance, his punches and kicks could be more powerful, allowing him to take on stronger opponents more easily.
His relationships would become more complex. The villagers who once hated him for having the Kyuubi inside him might now be even more terrified as he has its soul. However, Naruto's friends like Shikamaru would likely see this as an opportunity for Naruto to grow even stronger. They would try to help him harness this new power while also making sure he doesn't lose himself to the Kyuubi's wild nature. This new situation would test all of his relationships.
On the other hand, it could also strengthen his relationships with some characters. For instance, Kakashi, as his teacher, could be more proud of Naruto's growth in harnessing such a powerful force. And Naruto might also become a more respected figure among the younger ninja, who look up to him for his new - found power.
It could make her relationship with Sasuke more complex. Sasuke might be both intrigued and a bit jealous of her newfound power from the symbiosis. He could see her as a greater rival or, on the other hand, a potential ally he needs to keep close.
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.
When the Kyuubi possesses Naruto, his friends' trust in him is tested. Some, like Shikamaru, might be more cautious and try to keep an eye on Naruto to make sure he doesn't go out of control. Others, like Choji, might be more sympathetic and try to offer Naruto support. This possession changes the dynamics. Naruto might feel isolated as his friends struggle to understand what's going on with him, and it takes time for them to rebuild their normal relationships.
His friends might respect his decision more. They know how powerful the Kyuubi's chakra is, but also understand Naruto's reasons for not wanting to use it. This could strengthen their bond as they see Naruto's integrity.
The symbiote could make Naruto's relationships more complicated. For her friends, they might be initially scared or distrustful of the new - looking Naruto with the symbiote. For example, Sasuke might see her as a threat now. But as they learn that the symbiote is actually helping Naruto control the Kyuubi, they might slowly accept it.
When Naruto releases the Kyuubi in the fanfic, it might change his relationship with his sensei, Kakashi. Kakashi would be on high alert, ready to step in if Naruto loses control. At the same time, he would be guiding Naruto on how to better manage the Kyuubi's power. This could bring them closer as Naruto learns from Kakashi's experience. And Naruto's relationship with the other ninja in the village would also shift. Some would look up to him more as a powerful force to protect them, while others might be jealous of his new - found strength.
With Sasuke, it could go either way. Sasuke might see Naruto as an even greater rival now that he has the Kyuubi's power. Or, he could respect Naruto more for being able to harness such a great power. But overall, it would add a new dynamic to their complex relationship.