His relationship with his sensei, like Kakashi, would also change. Kakashi would have to train Naruto to control his dragon powers. Naruto might be a bit more rebellious as a dragon, feeling the freedom that comes with his new form. But Kakashi would still be there to guide him, and their bond would transform into one that focuses on Naruto's new abilities and how to use them for the good of the village.
His relationship with Iruka could be different. Iruka might be more cautious at first, not knowing how to deal with Naruto's dragon side. But as he sees Naruto is still the same good - hearted boy, he would become a great support. With Sasuke, there could be a new level of rivalry. Sasuke might be jealous of Naruto's unique powers. Naruto, on the other hand, would try to use his powers to bring Sasuke back to the right path.
If Naruto became a dragon bijuu in fanfiction, his relationship with his friends would face a big transformation. His friends would need to get used to his new appearance and powers. For instance, they might be scared at first when they see him as a dragon. But as time goes on, they would realize that Naruto is still the same person inside. However, his enemies would see him as a more dangerous target. And his relationship with the other bijuu could also change. He might be seen as an equal or even a leader among them, which would change the power dynamics in the bijuu world.
His relationship with Sasuke might be more complex. Sasuke might be both jealous and in awe of Naruto's newfound powers. And Naruto might try to use his god - like abilities to bring Sasuke back to the right path more forcefully.
His relationship with Sasuke might improve more quickly. Naruto, being smart like Minato, could better understand Sasuke's motives and pain. He could come up with more effective ways to reach out to Sasuke and convince him to return to the village. For example, instead of just relying on brute force or pure emotion, he could use intelligent arguments about their shared past and future goals.
In this fanfiction, Naruto's relationships would be transformed. With his old friends like Sakura, she might be both scared and curious about his dragon form. Naruto would also have to form new relationships with dragons. Some dragons might be hostile towards him because he was once a human. But he could also find some dragon friends who accept him for who he is. His relationship with his sensei, like Kakashi, could also change as Kakashi has to deal with Naruto's new identity and powers.
With Kakashi, Naruto's relationship could change a lot. Kakashi has always been a mentor to Naruto. But if Naruto is Madara's grandson, Kakashi might be more cautious. He has a history with the Uchiha and Madara in particular. So, he could be more watchful of Naruto, which might make Naruto feel a bit alienated from his old teacher. At the same time, Kakashi could also see it as an opportunity to guide Naruto in a way that prevents him from going down Madara's dark path.
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.
If Eragon turns into a dragon, his relationship with Saphira would be very different. They might become equals rather than dragon and rider. His human friends may be initially scared or confused. But some, like Arya, might see it as an opportunity to gain a powerful ally for the fight against evil. His enemies would be more fearful of him, seeing him as a greater threat.
His relationship with Toothless would be very different. Toothless might be initially confused and a bit hesitant around Hiccup in his new form. But as time passes, they would develop a new kind of bond based on Hiccup having to adapt to being a dragon. With Astrid, it could be strange at first. Astrid might be both curious and a bit jealous of Hiccup's new dragon form. She would have to see Hiccup in a whole new light.
His relationship with his guildmates would likely become more complex. They might look at him with a mix of awe and a bit of fear. His closest friends would still support him, but they would have to get used to his new - found power.