The villagers of Konoha would turn against Naruto. They've always seen him as a hero, and this sudden change would terrify them. Naruto, who once yearned for their acceptance, would now be an outcast. His relationship with the Hokage, whether it's Tsunade or someone else, would become very difficult. The Hokage would have to decide whether to try to rehabilitate Naruto or to consider him a threat to the village. This would also affect Naruto's international relations. Other villages that once respected him might now see him as a dangerous enemy.
His relationship with Sasuke would be greatly affected. Sasuke, who has his own experiences with the idea of killing, might see Naruto in a new light. They could either become rivals again or Sasuke might try to 'save' Naruto from his new dark path. With Sakura, she would be horrified. She's always seen Naruto as a positive force, and this change would make her question everything. She might even try to use her medical skills to 'cure' Naruto of his new - found killer tendencies.
His friends in the Konoha 11 would be deeply divided. Some might believe that Naruto has been forced into this situation and try to understand him, while others would see him as a traitor. Shikamaru, for example, would likely be conflicted. He's a strategist and would try to figure out a way to bring Naruto back to the right side, but at the same time, he couldn't ignore the fact that Naruto has killed. Naruto's relationship with his sensei, Kakashi, would also be strained. Kakashi has always taught Naruto about the importance of life, and Naruto becoming a killer would be a huge blow to their teacher - student bond.
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 becomes a nukenin, his relationship with the village elders would be completely severed. They would see him as a threat, and he would see them as unjust. With his peers, some might side with him, believing in his innocence. Others would follow the village's orders out of loyalty. His bond with the Nine - Tails would also change. The Nine - Tails might offer more support, seeing Naruto as an outcast like itself.
If Naruto becomes a Saiyan in fanfiction, his relationship with his mentor, like Jiraiya, could be different. Jiraiya would have to guide Naruto in handling these new Saiyan powers. Naruto's friends might be both in awe and a little scared. For example, Sakura might be worried about Naruto losing control of his new powers. And his relationship with the villagers could change too. Some might see him as an even greater protector, while others might fear his new, more alien - like powers.
His friends in Team 7, Kakashi included, would be deeply concerned. They would try to figure out what made Naruto change. However, Naruto's coldness would make communication difficult. He might distance himself from them, seeing their attempts as interference. His relationships with the villagers would also change. People who once looked up to him might now be afraid of him, as his cold demeanor is a far cry from the hero they knew.
If Naruto becomes a Jigsaw fan in fanfiction, his relationships would change drastically. His friends and comrades in Konoha would be confused and concerned. They have always known Naruto as a kind - hearted and positive person. His newfound interest in Jigsaw's ways would seem out of character. For instance, his bond with Hinata would be severely tested. Hinata, who loves Naruto for his heroic and gentle nature, would be at a loss on how to deal with this new, darker Naruto. His relationships with the other ninja clans in the village would also become tense as they would view his new ideology as a threat to the village's peace and stability.
Well, when Naruto becomes the Death God in fanfiction, his relationship with Sakura would change. She might be more hesitant around him, as his new power is so otherworldly. And his bond with Kakashi would also be different. Kakashi, being a wise ninja, would try to guide Naruto in using this power responsibly. Naruto's relationships with the villagers would shift too. Some might worship him, while others could be suspicious of his new - found power.
Well, his relationship with the village as a whole would be one of enmity. But on an individual level, some of his friends might secretly support him. Naruto would likely be more cautious about trusting new people. His connection with the other jinchuriki might become stronger as they can relate to his situation of being an outcast. His relationship with Kakashi - sensei would be filled with conflict. Kakashi would have to balance his duty to the village and his feelings for Naruto, who he has trained and cared about.
Well, Naruto's relationships would change significantly. For instance, his relationship with his sensei, Kakashi, could shift. Kakashi would become more of a mentor in a different way, guiding Naruto through this difficult time. With his peers, they would no longer see him as just the powerful ninja he once was. Some might pity him at first, but Naruto's positive attitude could turn that pity into respect. And his relationship with the village as a whole would change too. He would become more of an inspiration, a symbol of perseverance in the face of adversity.
Naruto's relationship with his students, if he has any as a Jounin, would be very important. He would be a mentor figure. He would have to be strict but also kind, just like Kakashi was to him. He would pass on his values and ninja techniques. His relationship with the Hokage would also be different. He would be closer to being an equal, having more say in important decisions regarding the village's security and future.
His relationship with Sasuke would be very different. Sasuke might see Naruto as a threat at first, given the power of the Juubi. But eventually, they could come to an understanding. Naruto would still want to protect Sasuke, and Sasuke might realize that Naruto's intentions are pure even in his Juubi form.