With Sasuke, they would have a new dynamic. Sasuke might see Naruto as an even greater threat or an equal who he can finally have a true showdown with. Or, they could team up in a new way, with Naruto's new power being a key factor in their combined strength against new enemies.
His relationship with Sakura would change. Sakura might be more in awe of him, but also worried about his new power. She would try to be there for him as a medic - ninja, ready to heal him if the power gets out of control.
His relationship with Sasuke would be greatly affected. Sasuke might see Naruto as a completely different person now that he has become the Nine - Tails. There could be a sense of fear or at least a new level of caution from Sasuke. They might have to re - establish their bond, as Naruto's new form could be a threat in Sasuke's eyes.
His relationship with Sasuke could become more competitive in a different way. Instead of just competing in ninjutsu, they would now compete in swordsmanship skills. This could add a new layer to their rivalry.
If Naruto becomes the Ten - Tails Jinchuuriki in fanfiction, it would be a game - changer. Firstly, his physical strength would skyrocket. He could move at incredible speeds and deliver punches and kicks with devastating force. Secondly, his sensory abilities would be off the charts. He would be able to detect enemies from miles away. Thirdly, his ninjutsu would be on a whole new level. He could create massive and powerful jutsus with ease. However, he would also have to deal with the potential negative effects of containing such a powerful entity within him, like the risk of losing control. But knowing Naruto, he would find a way to master it and use it for good.
His relationships would change drastically. With his friends in the Hidden Leaf, there would be a sense of distance. For example, Sasuke might be confused by Naruto's decision. But at the same time, Naruto might form new relationships with the animals and plants in his hermitage area.
His relationship with Sasuke would become very strained. Sasuke, who has always been somewhat distrustful, would see Naruto as a real threat now. He might even consider Naruto an enemy and try to stop him.
Naruto's relationship with the other Leaf Village ninjas would also shift. Some might be suspicious of his new - found admiration for Itachi, especially those who were directly or indirectly affected by Itachi's actions. However, others who understand Itachi's true motives, like Kakashi, might support Naruto. This could create a complex web of relationships within the village, with Naruto at the center trying to balance his new beliefs and his old friendships.
His relationship with Sasuke would be severely strained. Sasuke, who has his own goals and views on power, would see Naruto's demon transformation as either a threat or a sign of weakness. He might distance himself from Naruto or even see him as an enemy to be defeated.
With his enemies, they would now see him as a more dangerous threat. Instead of the Naruto who always tried to understand and find a peaceful solution, this new bloodthirsty Naruto would be more likely to attack on sight. His enemies would either try to avoid him or team up against him, which would create a whole new dynamic in the ninja world. As for his relationship with the village, the villagers who once supported him might start to fear him and demand that he be controlled or exiled.
His relationship with his mentor, like Kakashi, would also change. Kakashi would probably be very concerned and try to guide Naruto back to his normal self. However, Naruto in wrath might see Kakashi's attempts as interference and oppose him. Naruto could also start to distance himself from his other friends like Shikamaru and Choji, who would be left wondering how to bring back the old Naruto they knew.
With the village as a whole, Naruto's status might change. Some villagers who once saw him as a powerful hero might now pity him. This could be difficult for Naruto to handle. However, the children in the village would likely look up to him even more, seeing his struggle against blindness as an inspiring example. His relationship with the village elders would also be different. They might question his ability to continue being a ninja, which would put Naruto in a position where he has to fight not only his blindness but also the doubts of the elders.