In a fanfiction where they join Akatsuki, Naruto would experience a significant shift in his character. His sunny disposition might be clouded by the dark undertones of Akatsuki. He'd constantly be at war with himself, trying to balance his desire to make things right in the world with the immoral actions Akatsuki often undertakes. For Temari, she would have to adapt quickly. She might become more ruthless in order to fit in, but also secretly work towards undermining Akatsuki. Their friendship would also be put to the test as they face different challenges within the organization. Their growth would depend on how they navigate the complex web of relationships and power dynamics within Akatsuki.
Their relationship could become more of a mentor - mentee type. Itachi, being more experienced, could teach Naruto some of his ninja skills and strategies. Naruto, in turn, could help Itachi see the value in hope and friendship again. They might start to rely on each other more and more as they face the challenges within Akatsuki.
One possibility is that they join under false pretenses. Maybe they think Akatsuki has a different goal than it actually does. For example, Naruto might believe they are working towards peace in a different way and Temari could be there to keep an eye on Naruto. However, once they discover the true nature of Akatsuki, they would have to decide whether to stay and try to change it from the inside or leave and become enemies.
If Sakura joins the Akatsuki in fanfiction, her character would likely become more self - reliant. In Konoha, she had friends and mentors to rely on. But in the Akatsuki, she would be among people who are not as trustworthy. This would force her to rely on her own skills and instincts more. Also, she might become more secretive. Since she's in a group that's not exactly friendly to Konoha, she'd have to keep a lot of things to herself.
Regarding Kisame, Naruto's positive and energetic attitude could be a shock to him. Kisame might start to question his own loyalty to the Akatsuki as Naruto tries to bring a different perspective. Their relationship could be one of constant friction and yet also a bit of mutual respect as Naruto doesn't shy away from Kisame's power.
Their relationship could develop as they get to know each other's families. Naruto introducing Temari to Iruka sensei and the other villagers, and Temari introducing Naruto to her brothers. Through these interactions, they see how well they fit into each other's lives and how their families accept them, which further cements their love for each other.
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.
His personality might become more guarded. He'd be surrounded by people who are mostly out for themselves or have very different values from him. So, he'd need to be more cautious in showing his true self.
If Naruto joined the Akatsuki, his relationship with the other Akatsuki members would be diverse. Some, like Hidan, might see him as an enemy no matter what. But others, like Konan, might be more open to him. She has a more complex view of things compared to some of the more blood - thirsty members. Naruto would also have to deal with the Akatsuki's leader, Pein. Their relationship could range from mutual respect to outright hostility depending on Naruto's actions and goals within the organization.
Eventually, their relationship could be one of deep respect and admiration. Temari would see Naruto as not just her master, but also as a role model. Naruto would be proud of how far Temari has come under his tutelage. They might even end up being important allies in future battles, with a relationship that is based on both professional respect and personal friendship.