His friends might respect him more for having a useful new skill.
Well, it would be a huge blow to his friendships. Naruto's friends are drawn to his big heart and strong emotions. An emotionless Naruto would not respond in the same warm way. He might not share in their joys or sorrows. Sakura, for instance, would miss his determination and the way he used to encourage her. His friends would have to work hard to reach out to him, but they may also start to drift apart because the emotional connection is no longer there.
When Naruto becomes Hinata, his relationship with Naruto's friends would be complex. He'd be in a female body and have to navigate through the different expectations society has for Hinata. His relationship with Kiba and Shino, Hinata's former teammates, would become more personal as he now shares Hinata's memories and feelings. And his relationship with Naruto's old crush, Sakura, would be a bit awkward as he tries to act like Hinata.
It would likely strain his relationship with Sasuke. Sasuke has his own complex history with Orochimaru, and if Naruto becomes a fan, Sasuke would be very confused and probably angry. He might see Naruto as betraying their shared values. As for his friends in Konoha, they would also be worried and try to talk Naruto out of it, which could lead to some arguments and a rift in their friendships.
It would have a huge negative impact. Naruto's friends have come to rely on his emotional support and his ability to inspire them. Without his emotions, he might not show the same enthusiasm in helping them. His friendship with Kakashi would also change as Kakashi has guided Naruto in part based on his emotions and his will to protect his friends. Naruto might seem distant and unresponsive, causing his friends to feel rejected.
In terms of his rivals, like Sasuke, Sasuke might view Naruto's new hairstyle as a sign of him trying to be different or better. This could either fuel their rivalry more or, in an interesting turn, make Sasuke respect Naruto's confidence in changing his look.
Naruto's optimistic personality would have a great impact. He'd always be positive in front of patients, giving them hope. For instance, when dealing with terminally ill patients, his positive energy might boost their will to fight the disease.
Well, his friends might start to feel like he's drifting away. Since he's hiding his strength, he can't fully participate in training or battles as they expect. For example, Sakura might think Naruto is being lazy or not trying hard enough, which could create some tension between them.
His malnourishment could make his friends worry more about him. For example, Sakura might start to be more motherly towards Naruto, constantly trying to get him to eat proper meals. His relationship with Sasuke could also change as Sasuke might initially look down on Naruto for being weak because of the malnourishment, but then as he sees Naruto's determination to overcome it, he gains a new respect for him.
Well, his friends might initially be shocked. But Naruto, being Naruto, would probably use his new power to protect them more fiercely. His relationship with Sasuke could become even more complex. Sasuke might see Naruto as a greater threat or a new source of power to rival. For Sakura, she'd be worried about Naruto's well - being and how this new form affects him. And his other friends like Shikamaru would start to strategize around Naruto's new abilities, changing the dynamic of their teamwork.
His relationship with Sasuke would become more complex. Sasuke, as an Uchiha, might feel threatened or intrigued by Naruto having the Sharingan. They could have a new level of rivalry or a new form of cooperation.