His friends might be initially shocked. For example, Sakura could be taken aback at first. But if Naruto's new appearance is for a good cause like a dangerous mission, they would quickly adapt and support him. They would still recognize him by his personality and spirit.
Perhaps he is trying to distance himself from his past self. Naruto has had a tough childhood and has been through a lot. Changing his appearance could be a way for him to start anew, to shed the image of the 'troublemaker' or the 'lonely kid'. He might want to present a new, more confident and respected image to the people around him, both friends and foes.
If Harry changes his look to seem more intimidating, it might make some of his enemies more cautious around him. For example, if he has a more severe look with a long beard and a scowl, the Death Eaters might think twice before attacking him. As for his friends, they might be a bit taken aback at first but would quickly accept the new look.
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Long-term nasal inflammation would affect one's appearance. Rhinoceros would cause the nasal cavity to be blocked, affecting breathing, and then changing breathing habits. It might cause the face shape to change, forming the so-called " rhinoceros face." Some of the effects included chin receding, neck leaning forward, teeth shifting, and so on. This was especially true for children who were growing and developing. If they had long-term sinusies and developed the habit of breathing through their mouths, these problems might be more obvious. However, it should be noted that facial changes caused by nasal obstruction and mouth breathing are a long-term process. It is relatively difficult for adults to change their faces, so there is no need to be overly anxious.
With his friends, it could initially cause confusion. They are so used to calling him Harry that the new name might be a bit of a shock. But if they understand his reasons, they would likely support him. For example, Hermione might be the first to adapt and help others adjust, using her logical thinking to see the benefits of the name change.
His friends might be initially shocked. Sakura could tease him about it at first but then grow to like the new look. Sasuke might be indifferent on the surface but secretly find it interesting. His enemies might underestimate him, thinking he's become more of a softie with the long hair, but then be surprised by his unchanged combat skills.
His long hair might make Sakura see him in a different light. Maybe she starts to notice his more mature side with the long hair and becomes more attracted to him. It could also change his relationship with Sasuke. Sasuke might initially mock his new look but later come to respect the power that seems to be associated with Naruto's long hair.
One possible reason could be for protection. Maybe there are threats out there targeting him, so by hiding his appearance, he can move around more freely without being recognized. For example, if there are rogue ninja who want to take revenge on him for past battles, hiding his face would make it difficult for them to track him down.
With Sasuke, it could either drive a wedge or bring them closer. If Sasuke blames himself for Naruto getting injured while protecting him, he might distance himself out of guilt. On the other hand, it could also make Sasuke realize how much Naruto means to him and he could become more committed to their friendship.
His apathy can strain his relationships. His friends might feel neglected. For instance, Sakura could be confused and hurt as Naruto no longer shows the same eagerness to be part of the team.