Sasuke's reaction could be complex. He might see Naruto as a more powerful opponent or ally, depending on their current relationship in the fanfiction. If they were still rivals, Sasuke might be intrigued by Naruto's new form and want to test his own strength against it. If they were friends, Sasuke would be concerned about Naruto's ability to control himself and would offer his help in any way he could.
His relationship with Hinata might be affected. She might be a bit more worried about him at first, but also see him as even more of a hero for having to endure this new transformation. With his friends like Shikamaru and Choji, they might be more cautious around him initially, but still be there to support him. They would have to get used to his new state and the potential danger it could bring.
His relationships with his friends would become more complex. His friends might be a bit scared or at least unsure about this new side of him. For example, Sakura might be worried about how to approach him now. Sasuke, on the other hand, might see Naruto in a completely different light, either as a threat or as an even more interesting rival. His relationship with the village elders would also be different. They might try to keep a closer eye on him or even isolate him to some extent.
In terms of his relationship with the other tailed beast hosts, it could become more complex. He might have a new understanding of what they've been through, but at the same time, they could be jealous of his new form. Some might see him as an upstart, while others might look to him for leadership. Naruto would have to navigate these tricky relationships carefully, all while trying to figure out his own new identity as a tailed beast.
He might become more wild and instinctive. Tailed beasts are known for their raw power and basic instincts. So Naruto could be more impulsive, acting on his first thoughts rather than thinking things through. For example, in a fight, he might not hold back as much as he usually does as a normal ninja.
One possibility is that Naruto would initially be confused and struggle to control his new form. He might accidentally cause destruction in the village as he tries to figure out his new powers. But with the help of his friends, like Sasuke and Sakura, he could start to learn to harness the tailed beast's abilities for good, perhaps even developing new jutsu.
Naruto's relationship with the other villages would be transformed. Some villages might be afraid that he would use the power of all tailed beasts against them. However, villages like Iwagakure, which had a history of conflict with Konoha, could now see Naruto as a unifying force. The younger generation in all villages would probably idolize him more than ever, seeing him as a symbol of ultimate power and justice.
Her relationship with her father would be different. She would no longer be the naive girl he once knew. She could be more of an equal to him, advising him on political matters. For example, she could tell him not to trust Littlefinger as much. And with her sister Arya, she might be more open and understanding from the start, instead of having the initial rifts between them.
His relationships with his friends would become more complex. For example, Sasuke might be jealous or in awe of Naruto's new power. Sakura might see him as more of a distant figure, someone she can't fully understand anymore. And his old teachers like Kakashi would be in a position of having to respect Naruto's new status while still trying to guide him in some ways.
His relationship with Sasuke would be very interesting. Sasuke, who has his own issues with the village, might see Naruto's banishment as another sign of the village's corruption. They could end up teaming up in a different way than before. With Sakura, she might be conflicted. She loves the village but also cares about Naruto. She could be one of the ones trying to bring Naruto back.
His relationship with Kurama might become more complex. Since he's now also a kitsune - like being. They could either become more competitive or find a new way to cooperate. With his friends, some might be in awe of his new form, while others might be a bit scared at first. But Naruto's kind heart would eventually make them all accept him as before.
If Naruto were an ancient god in fanfiction, his relationships would be transformed. His relationship with his teacher, Iruka, would shift from a mentor - student bond to something more like a prophet - deity relationship. Iruka might feel a great sense of pride but also a bit of unease in Naruto's presence. His friends in Team 7 would have to adjust. Naruto's new powers and status would make them reevaluate their own positions. They might feel a bit overshadowed, but also protected. And as for his enemies, they would be forced to either submit or plot more deviously against him, knowing that he is now an ancient god with powers they can't fully comprehend.