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.
Shikamaru, being the intelligent strategist, would probably try to figure out the implications of Sakura's move. He would consider how it affects Konoha's security and what Akatsuki's intentions could be in recruiting her. He might also be one of the first to suspect that Sakura could be a double agent. The rest of the Konoha 11 would also be affected. They would be sad and confused, but some like Ino might also be angry at Sakura for what they perceive as a betrayal of their friendship and the village.
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.
Shikamaru, being the intelligent strategist, would analyze the situation carefully. He would consider all the possible moves Orochimaru could make and try to anticipate his next actions. He might also try to figure out Orochimaru's motives for taking Sakura hostage in the first place.
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.
Sasuke might be more understanding. Given his own experiences of leaving Konoha, he could respect Naruto's decision. However, he might also secretly plan to keep an eye on Naruto from afar to make sure he is safe.
For Naruto, it would be a big shock. He's always seen Sakura as an important part of the team. He would probably feel guilty, thinking he might have done something wrong. Sasuke might be more reserved in his reaction, but deep down, he would also feel the loss. Kakashi would be worried about her safety. The other ninja in Konoha might start to question the unity of the village if someone like Sakura, who was so well - known, left. And the young ninja who looked up to Sakura would be disappointed and might even lose some motivation in their training.
Sakura's reaction would depend on how the author writes her character development. If she's become more confident in herself, she might approach Sasuke with a more assertive attitude. She could tell him that she's not the same girl he left behind. However, she'd still have that underlying love for him. She might also be worried about how the village will accept Sasuke's return and how it will affect her standing in Konoha. So her reaction would be a complex blend of personal feelings and concerns for the village.
Sakura would probably be very worried. She has always cared about Naruto deep down, so she might be constantly trying to find a way to bring him back. Kakashi, on the other hand, would likely understand Naruto's reasons to some extent. He might be sad but also respect Naruto's decision. As for Sasuke, if he is in the village at the time, he could be conflicted. He and Naruto have a complex relationship, and Naruto's leaving might make him realize how much Naruto actually means to him.
In the long run, the relationship could be mended if Naruto is able to show that his move to Suna has been beneficial not only to him but also to both villages. His friends might start to see his actions in a new light. They could collaborate on certain projects or missions that involve both Konoha and Suna. However, there would always be a sense of loss and change in their relationship. Naruto's departure would be a significant turning point, and they would have to re - evaluate their friendship in the context of the new situation where Naruto is now part of Suna.
With his family - like figures in Konoha, such as Iruka, the relationship would be put to the test. Iruka would probably be heartbroken but also hope that Naruto is doing what he thinks is right. In Iwa, Naruto might find a new mentor - like figure who could teach him different things compared to what he learned in Konoha. This new relationship could shape his ninja path in a whole new way.
His relationships would become very complex. His friends in Konoha would be in shock. Naruto leaving Konoha for Kumo is like a slap in the face to them. They would wonder what drove him to such a decision. For example, Naruto had such a strong bond with Iruka - his first mentor. Iruka would be deeply saddened and would question if he had failed Naruto in some way. And Naruto's relationship with Kakashi would also take a hit. Kakashi would be worried about what this means for the future and how it could potentially lead to conflict between Konoha and Kumo.