On the other hand, Sasuke could be a bit confused. He might not understand why Naruto, who has been his friend in the past, is refusing to teach him. This confusion could lead to him re - evaluating their relationship and trying to figure out what he has done to deserve this treatment. He may start to question his own actions and motives more deeply.
Naruto would probably be excited at first. He has always wanted to help Sasuke and this would be a great opportunity for him to do so. He'd be eager to share his skills and knowledge.
Naruto might be initially very disappointed. He has always looked up to Jiraiya and expected to be trained by him. So, when faced with the refusal, he could be heartbroken and feel like he has lost a great opportunity.
Naruto might be initially very disappointed. He has always looked up to Kakashi as a strong and cool ninja, and being refused by him would be a big blow. He could become a bit sulky and withdrawn, feeling like he's not good enough.
Sasuke would be completely shattered. His world would be turned upside down. He had always seen Naruto as a rival, but also as someone important. Naruto sacrificing himself for him would make Sasuke reevaluate his entire life. He would feel an overwhelming sense of guilt and would likely isolate himself from others. However, over time, he would start to use Naruto's sacrifice as a motivation to become a better person and to protect the things Naruto held dear. He would start to follow in Naruto's footsteps in terms of values like friendship and loyalty, and would try to make amends for his past mistakes.
Sasuke could also have a complex mix of emotions. On one hand, he has a long - standing relationship with 'Naruto' as a male friend. Now that he knows Naruto is a girl, he might start to feel a different kind of connection. He may become more protective, but also a bit confused about his own feelings towards this new - found knowledge. He might even feel a bit betrayed that Naruto has hidden this fact for so long.
It could be that Naruto is under some sort of external pressure. Maybe there are other people in the village who don't trust Sasuke and Naruto doesn't want to go against the village's wishes. Or he might be worried about Sasuke using the knowledge he teaches for the wrong purposes. Naruto has always been about protecting the village and he doesn't want to put it at risk by teaching Sasuke if he's not sure of Sasuke's intentions.
Naruto might initially be in denial. He's so used to having Sakura around and believing that they have a future together. So when she leaves for Sasuke, he might think it's just a temporary thing or that she's been influenced by something or someone. But as time passes and he realizes it's real, he would be deeply hurt. He might also start to question his own self - worth, thinking that he wasn't good enough for Sakura. And he might even try to win her back at first, but then slowly come to accept the situation and focus on his other responsibilities like being a ninja and protecting the village.
Naruto might initially be shocked. Given his friendly nature towards Sasuke in the original story, he wouldn't expect such an attack from her. So, his first reaction could be pure disbelief.
Well, Naruto might be furious. He's always been protective of Sakura. He'd probably drop everything he's doing and go after Sasuke to rescue Sakura. Naruto has a strong sense of justice and loyalty, especially towards his friends. And Sakura is one of his closest friends, so he won't stand by and let her be in danger.
Ron might be initially disappointed. He's always had a bit of a crush on Hermione, and this could be a blow to his ego. But if he's true to his character as we know him from the original series, he would respect her decision.