Naruto's relationship with his old friends in Konoha would become very strained. They would see him as a traitor, and he would have to deal with their hatred. But at the same time, some of his friends might suspect that there is more to his joining the Akatsuki than meets the eye and try to secretly communicate with him.
Within the Akatsuki, Naruto would form new relationships. He might initially clash with some of the more ruthless members like Hidan. But over time, he could start to influence them in a positive way. For example, he might convince some of them to spare innocent lives during their missions, which would be a big change in the Akatsuki's modus operandi.
His relationship with Sasuke would be extremely interesting. Instead of being rivals from different sides, they could become comrades within the Akatsuki. This would change the whole dynamic of their relationship, as they might now work together towards the Akatsuki's goals, at least for a while.
Naruto's relationship with his sensei, Kakashi, would be severely strained. Kakashi has always been a guiding figure for Naruto, and Naruto joining the Akatsuki would seem like a betrayal. However, Kakashi might also suspect that Naruto has an ulterior motive. As for his relationships with the other Konoha ninjas, they would be filled with suspicion and mistrust. But Naruto could also form new relationships within the Akatsuki. He might befriend some of the members who have a bit of good in them, like Konan perhaps, and together they could work towards a new future for the Akatsuki.
His relationship with Sasuke would be extremely complex. Sasuke, who has his own vendetta against the shinobi world, might initially be suspicious of Naruto's new role. But Naruto, as the Akatsuki leader, would try to convince Sasuke to join him in his new vision for the organization. It could be a love - hate relationship where they constantly butt heads but also understand each other on a deeper level.
His relationship with Sasuke would be drastically different. Instead of being rivals from the Leaf Village, they could be on opposite sides. Sasuke might see Naruto as a traitor to the Leaf and Naruto might see Sasuke as someone who doesn't understand the Akatsuki's motives. With Sakura, Naruto might not have the same protective feelings. He could view her as just another ninja from a village that the Akatsuki has issues with.
His relationships would be completely different. He would see the Akatsuki members as his family instead of the people in Konoha. He might not have the same bond with Sasuke as in the original story. Instead, he could form alliances with Akatsuki members like Itachi, but for different reasons. His view of the world and his enemies would be flipped.
Naruto as an Akatsuki member would probably develop a more calculating side to his personality. He'd need to plan his moves carefully, as one wrong step in the Akatsuki could mean death. He'd still have his core of kindness, but it might be hidden deeper. He might be more hesitant to show emotions like anger or sadness, as that could be seen as a weakness in the Akatsuki. His loyalty would also be a complex thing. While he might be loyal to certain ideals he still holds, his loyalty to the Akatsuki as an organization would be conditional and full of internal conflict.
The relationship between Naruto and Sakura would become much more strained yet also more intense. Sakura would be constantly worried about Naruto's safety in Akatsuki. Naruto, on the other hand, would be in a difficult position as he's in an enemy organization but still cares about Sakura and Konoha. His relationships with the Akatsuki members would also be complex. Some might see him as an opportunity, while others might be hostile. Sakura's relationship with the rest of Konoha would also be affected as she tries to support Naruto from afar.
Naruto and Sasuke's relationship might become more complex. On one hand, they are in a new and dangerous environment together, which could strengthen their bond as they rely on each other. But on the other hand, the ideology of Akatsuki might put some strain on their relationship if they have different views on how to handle the situation within the organization. For example, Sasuke might be more inclined to use force while Naruto tries to find a more diplomatic solution.
Naruto joining Akatsuki in fanfiction would turn his relationships upside down. His friends in the Leaf would initially feel betrayed. However, some might start to question if there's more to Naruto's decision. His relationship with Akatsuki members would be a mix. He'd be constantly in a tug - of - war with Itachi, who has his own plans regarding Naruto. And his interactions with Pain would be intense, as Pain represents a very different ideology from Naruto's. Naruto would have to struggle to find common ground or at least a way to coexist with these new 'comrades' while still holding onto his own values.
His relationship with Sasuke would become even more complex. Sasuke might be suspicious of Naruto's motives for joining Akatsuki, thinking he has truly turned to the 'dark side'. Or, they could end up on opposite sides of a conflict within Akatsuki itself if their goals within the organization differ.
If Naruto was trained by the Akatsuki in fanfiction, his relationships would be completely transformed. For starters, his relationship with Kakashi would be strained. Kakashi has always been Naruto's mentor in a way, and seeing Naruto side with the Akatsuki would be a shock. His friends like Sakura and Shikamaru would also be confused and probably try to bring him back to the 'right side'. And his relationship with the villagers of Konoha would turn sour as they would fear his new - found Akatsuki - related powers.