Her character could develop a darker side. Being around the Akatsuki, who are often associated with more morally ambiguous actions, might make her question her previous beliefs. She could become more ruthless in combat and decision - making.
Sakura might develop new relationships within the Akatsuki. She could form bonds with some of the members that would change her perspective on the world. For example, if she befriends someone like Hidan, she would have to understand his religious fanaticism and how it drives his actions. This would make her more empathetic to different viewpoints and in turn, develop her character.
Sakura's character would experience a huge transformation. Her joining the Akatsuki means she has to interact with a group of outcasts and villains. This would make her more street - smart and less naive. She would also have to hide her true feelings, which could make her more introverted in a sense. Her medical skills would still be an asset, but she might have to use them in ways she's not used to, like healing enemies of the Leaf Village, which would be a big moral struggle for her.
She would develop a more survival - based mindset. The Akatsuki is a dangerous group, and to survive among them, Sakura would have to be tough. This could lead to her being more self - reliant and less likely to rely on others for help. For example, she would train harder on her own to prove her worth to the group. Also, she might be more distrustful of people outside the Akatsuki at first, seeing them as potential threats.
She would become more adaptable. The Mist's different environment and fighting styles would force her to change. Her physical skills might improve as she trains with Mist ninja who have different combat techniques. For instance, she could learn to be more stealthy like the Mist assassins.
Her character could develop in a way that she becomes more independent. In the fanfiction, away from the protection of her usual teammates, she has to fend for herself among Orochimaru's minions. This would force her to rely on her own strength and intelligence. Also, she might develop a darker side. Being around Orochimaru's evil influence, she could struggle with maintaining her positive outlook and might have moments where she is tempted by the power he offers without considering the consequences.
The story would take a very different turn. Naruto's godlike abilities would give Akatsuki an edge in battles. But his values would clash with the group's. This could lead to him either changing Akatsuki or being forced out. It would also affect his relationships with his old friends in Konoha. They might see him as a traitor at first, but as the story unfolds, they could come to understand his motives.
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.
With Naruto, it would be a huge shift. Naruto has always seen Sakura as a friend from Konoha. If she joins Akatsuki, Naruto would be confused and probably try to convince her to come back. Their relationship would become strained as they would be on opposite sides, at least initially. Naruto might see her as a lost friend that he needs to save.
Naruto's character would develop in a very complex way. He'd be constantly struggling between his own values and the actions he has to take as part of Akatsuki. His experience in Akatsuki could make him more cynical as he'd be surrounded by people with dark pasts and motives. However, he'd also try to bring out the good in them, which could strengthen his belief in the power of friendship even more. His view of the ninja world would also change. He'd see the other side of the coin, the outcasts and the reasons they became who they are. This could lead to a more nuanced understanding of the world's problems and solutions.
His character would likely become more conflicted. He'd be torn between the values he grew up with in Konoha and the new, darker values of Akatsuki. His development would be a struggle between his innate goodness and the evil around him.
If Naruto gets the Rinnegan and joins Akatsuki, his character would develop in a very complex way. His values would be put to the test. He's used to the Konoha way of life and values like friendship and protecting the village. In Akatsuki, he'd be exposed to a different set of values. His character could become more cynical as he sees the darker side of the ninja world up close. But at the same time, his inner goodness could also try to influence Akatsuki members. His development would also be affected by his new powers. The Rinnegan could make him more self - reliant as he discovers new abilities, but it could also isolate him as others might fear his power. He'd be constantly battling between his old self and the new self influenced by Akatsuki and the Rinnegan.