Sasuke would probably be very suspicious. He's always been wary of Naruto's power, and if Naruto started showing Satan - like traits, Sasuke would see it as a threat. He might even think Naruto has finally given in to the darkness. Sakura would be shocked and heartbroken. She's always seen Naruto as a positive force, and this change would be hard for her to accept. Kakashi, on the other hand, would try to understand what happened to Naruto and see if there's a way to bring him back.
Jiraiya, if he were still alive in this fanfic, would be deeply disappointed. He trained Naruto and hoped he would be a great ninja following the right path. Seeing Naruto turn into a Satan - like figure would make Jiraiya feel like he failed. Tsunade would be in a difficult position. As the Hokage, she has to protect the village, but she also has a soft spot for Naruto. She might try to find a way to contain Naruto's new powers without harming him, while also trying to figure out what caused this transformation.
Sasuke would likely be deeply affected. He might initially be angry that he couldn't protect Naruto. As Naruto becomes a monster, Sasuke would be conflicted between his desire for power and his loyalty to his friend. He might try to find a way to bring Naruto back to normal so he can have his rival back. Sakura would be heartbroken. She would probably cry a lot and then try to find a medical solution to reverse the transformation. Kakashi would see it as his failure to protect Naruto and would do everything he could to stop the monster Naruto from causing harm while also looking for a way to save him.
It could be really dark. Naruto might have some devilish powers inherited from Satan. His personality could be a mix of his original self - determination and some evil traits. Maybe he would struggle with his identity, being part of the ninja world but also having this dark origin.
The older generation, like Kakashi, would be very cautious. He has seen a lot in his life and would be worried about the implications of Naruto having such god - like powers. He would try to guide Naruto to use these powers responsibly, fearing that Naruto's inexperience with such power could lead to chaos in the ninja world.
The ninja from other villages would also have different reactions. Those who knew Gaara and his past might be more understanding of Naruto's new behavior, thinking it's just a phase or a way for Naruto to grow. However, those who were enemies of Gaara in the past might see Naruto's change as an opportunity to attack, believing that he has become more vulnerable or unpredictable. The Akatsuki members, if they are still around in the fanfic, might try to take advantage of Naruto's new state, seeing it as a chance to capture him or use his power for their own evil purposes.
Sasuke would likely be very suspicious at first. He has always been on guard around Naruto, and this new revelation would make him even more cautious. He might see Naruto as a potential threat to the village or to his own goals.
Iruka would probably be one of the first to notice and try to step in. He has always been like a father figure to Naruto. He would likely confront Kushina and try to protect Naruto. Sasuke might be a bit more conflicted at first. He has his own issues, but seeing Naruto being abused, he would probably end up on Naruto's side and try to figure out what's wrong with Kushina.
Sasuke would be deeply affected. He and Naruto had a complex relationship. His first reaction might be shock and then a deep sense of loss. He might feel guilty for not being there to help Naruto. Sakura would be heartbroken. She had always cared for Naruto, and his death would be a huge blow. She might become more determined to protect the village in his memory. And Boruto, Naruto's son, would be devastated. He would probably grow up with a strong sense of purpose to live up to his father's sacrifice and protect the village even better.
Sakura might be initially shocked and then start laughing uncontrollably. She would probably tease Naruto about it for a while. Sasuke, on the other hand, would likely just give a slightly raised eyebrow and then act as if it's not a big deal, but deep down he might be a bit amused. Kakashi would probably make a dry joke about it.
Sakura would be worried sick. She'd try to figure out what happened to Naruto to make him act this way. She might try to talk to him, use her medical ninjutsu to check if he's under some kind of genjutsu or has some other problem. She'd be very vocal about her concerns and would try to get the other villagers to help bring Naruto back to his normal self.
Naruto would likely be excited yet a bit scared. He'd be eager to make the future a better place but also worried about the bad things he might see. Sasuke would probably be more reserved, analyzing the future information carefully. Hinata would be shy about it but also determined to protect those she loves if she saw any danger in the future for them.