The relationship between Naruto and Sasuke might become more of a cat - like rivalry. They could be chasing each other around, or competing for the best spot in the sun. And Sakura might have to be the one to break up their little cat fights.
When the TMNT turn into dragons, their relationships could shift in various ways. Their usual dynamic of being a team of mutant turtles would be disrupted. Maybe Mikey would be the most excited about their new forms and try to get his brothers to embrace the dragon - like qualities more. Raphael might struggle with the change and become more withdrawn, causing the others to reach out to him more. Their relationships would be a mix of adjusting to the new physical forms and the emotions that come with it.
His relationship with Sasuke would likely be very different. Sasuke might be more suspicious of Naruto at first, seeing him as an unknown entity. But as they learn more about Naruto's new situation, they could develop a deeper bond based on Naruto's unique perspective.
If Naruto was turned into a monster in fanfiction, his relationship with the village would change drastically. The villagers who have finally started to accept him as a hero would once again be fearful. His friends would be divided in their reactions. Some, like Shikamaru, would immediately start thinking of ways to solve the problem. Naruto's relationship with his mentor, Kakashi, would be put to the test. Kakashi would have to balance his duty to the village and his loyalty to Naruto. And Naruto himself would feel isolated, which could further impact his relationships as he might become more withdrawn in his monster form.
His relationship with Sasuke would likely be affected. Sasuke might initially be suspicious of Naruto's new form, thinking it could be a trick by an enemy. But as time goes on, they could find new ways to work together. Naruto's new Kitsune powers could complement Sasuke's skills. For example, Naruto could use his enhanced speed as a Kitsune to keep up with Sasuke in combat.
Sasuke and Sakura's relationship would be different. Without Naruto as a buffer, they might have a more strained relationship. Sasuke could be more focused on his own goals and less patient with Sakura. Kakashi's relationship with the team would also change. He wouldn't have Naruto's unique brand of enthusiasm to deal with, so he might be more strict with Sasuke and Sakura.
His relationship with Sakura might change. Sakura could be initially shocked by his new look and it might make her see him in a different light. Maybe she starts to notice him more as a person rather than just her friend. For example, she might become more curious about what happened to cause the change and in the process, grow closer to him.
In this fanfic scenario, Naruto's relationship with Iruka would be tested. Iruka, who has always seen Naruto as a student and a friend, would now have to deal with a Naruto who is part - nine - tails. He would worry about Naruto's future and how society will accept him. Naruto's interactions with the other jinchuriki could also change. They might sense a kinship with him in a different way now that he has fully become a nine - tails. And his relationship with Tsunade would likely involve her trying to find a way to either reverse the transformation or make sure Naruto can control it, while also dealing with the political unrest that might come from Naruto's new state.
The relationship between Harry and Snape would be completely transformed. In the original timeline, Snape had a lot of pent - up anger towards Harry because of his resemblance to James. But if time was turned back, Snape might see Harry as an opportunity to right the wrongs of the past. He could become a mentor to Harry, teaching him advanced potions and dark arts defense in a way that Dumbledore never did. This would also change Harry's perception of Snape from a bitter enemy to a trusted ally.
His relationship with Sasuke would be completely shattered. Sasuke, as an Uchiha, would surely seek revenge against Naruto. This would create a very intense and dark dynamic between them, far from their original friendship.
If Naruto characters were turned into cats in fanfiction, it could lead to some really interesting scenarios. For example, Kakashi as a cat could still be seen reading his naughty books, but now he has to use his paws to turn the pages. And Jiraiya as a cat would likely be chasing after female cats instead of women. Also, the Akatsuki members as cats would form a really intimidating cat gang.