Naruto's relationship with his enemies would surely be affected. Enemies might target him more if they think his red hair is a sign of a new power they can steal or a weakness they can exploit. On the other hand, some enemies might be more hesitant to attack him, fearing that the red hair is a sign of a new and unknown strength. His relationships within the ninja world in general would be in flux, as everyone tries to figure out what this red - haired Naruto means for the balance of power.
In terms of his relationship with the villagers, those who once bullied him for being an orphan and having a different look (with his blond hair) might be even more hostile if his red hair makes him stand out more. However, there could also be some villagers who see his red hair as a sign of something special and start to respect him more, which could lead to a shift in how Naruto views the village and his place in it.
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.
It would change it a great deal. His red hair might make him stand out even more, and with the Rinnegan, his power level would be off the charts. Enemies might be more afraid of him, and allies might look at him with a new level of respect or suspicion. The power dynamics in battles would be completely different. For example, he could use the Rinnegan's abilities in ways that no one has seen before, changing the strategies of both his side and the enemy's side in wars and skirmishes.
His relationship with Sasuke might be different. Sasuke could be more intrigued by Naruto's new look and the possible mystery behind the black hair. It could either create more tension or bring them closer as they try to figure out what's going on.
His long hair might make Sakura see him in a different light. Maybe she starts to notice his more mature side with the long hair and becomes more attracted to him. It could also change his relationship with Sasuke. Sasuke might initially mock his new look but later come to respect the power that seems to be associated with Naruto's long hair.
In some fanfics, his long red hair might make him more attractive to certain characters. For example, Sakura could start seeing him in a new light, as the change in his appearance makes him stand out more. It could also make his enemies more cautious, thinking he has some new power associated with the hair.
His friends might be initially shocked. Sakura could tease him about it at first but then grow to like the new look. Sasuke might be indifferent on the surface but secretly find it interesting. His enemies might underestimate him, thinking he's become more of a softie with the long hair, but then be surprised by his unchanged combat skills.
His relationship with Sasuke would likely become more of a partnership. As Hokage, Naruto would need Sasuke's skills and knowledge to protect the village. They would probably have regular meetings to discuss security and other important matters.
With his new status and appearance, Naruto's relationship with his family would also change. His relationship with Hinata might face new challenges as he has to balance his duties as Daimyo with his family life. His children would grow up in a different environment, with Naruto being a figure of political power. And his relationship with the older generation, like Kakashi, would shift as they now have to respect him as a leader.
His relationship with Sakura might change. She could be more intrigued by his new look and start to see him in a different light, not just as the annoying kid. With Sasuke, Sasuke might be more jealous as Naruto's blue hair makes him even more unique and gets more attention.