In terms of her character development, Sakura would likely become more of an anti - hero. She would be in a morally grey area. On one hand, she is with a group that is seen as villains by most of the ninja world. On the other hand, she might still have her own reasons for joining, like seeking power to protect something or someone. This new path could make her more independent and force her to rely on her own skills and judgment rather than depending on the support system she had in Konoha.
Naruto would be devastated. He has always considered Sakura as a dear friend and teammate. He would probably try to convince her to come back at first. If that fails, he might see it as his mission to bring her back by force if necessary, believing that she has been led astray. Sasuke, on the other hand, might have a more complex reaction. He has his own issues with Konoha, so he might understand Sakura's desire to leave on some level, but he would also be suspicious of her motives for joining Akatsuki.
Yes, there might be some. You can try searching on fanfic websites like FanFiction.net or Archive of Our Own. They usually have a large collection of fan - made stories including ones related to Naruto where Sakura could potentially join the Akatsuki.
One possible scenario is that Sakura could bring her medical skills to the Akatsuki. She might be able to heal some of the members who are constantly in battle and injured. This could change the group's dynamic as they would no longer have to worry as much about their wounds. Also, her combat skills could be enhanced by learning from the Akatsuki's unique fighting styles.
One possible plot could be that Sakura joins the Akatsuki in an attempt to spy on them for Konoha. She might pretend to be a rogue ninja interested in their goals. However, as she spends time with them, she starts to understand their motives which are not as black - and - white as she initially thought.
Sasuke might initially be shocked. He has always seen Sakura as someone connected to Konoha, so her leaving would be unexpected. He could be concerned about her safety, especially if she leaves without proper preparation or protection.
In a 'Sakura and Hinata joins Akatsuki' fanfiction, perhaps they are forced to join. The Akatsuki could be holding something or someone important hostage. Sakura might be trying to find a way to break free from the inside, using her intelligence and combat skills. Hinata, on the other hand, would be more conflicted due to her gentle nature. She might befriend some of the more empathetic Akatsuki members and try to persuade them to change their ways.
In a fanfiction where Sakura Haruno joins the Akatsuki, it could start with her being captured by them. Instead of killing her, they see her potential. She then has to adapt to their way of life. She might learn new jutsu from them. But she would also be constantly torn between her new comrades and her old friends. She could try to find a middle ground, where she can use the Akatsuki's resources to protect both the Akatsuki members who have some good in them and her friends from the Leaf Village.
In a fanfiction where Sakura and Ino join Akatsuki, they might initially be forced into it. Akatsuki could see their potential as valuable assets. Sakura's strength and Ino's intelligence could give Akatsuki an edge. But, Sakura and Ino would not just sit around and follow orders. They would probably start to influence other members. For example, they could make some of the Akatsuki members question their loyalty to the main goals of the group. It would be an interesting dynamic to explore in the fanfiction.
Well, one possibility is that Naruto would face a lot of distrust in Iwa at first. He's from Konoha, after all, which has had a history of conflict with Iwa. But Naruto being Naruto, he might gradually win over some of the Iwa ninjas with his determination and unique skills. He could learn new jutsus specific to Iwa's style of fighting, which would make him an even more formidable ninja.