In some fanfictions, Team 7 might hurt Naruto through their words. For example, Sasuke could say something really mean about Naruto's lack of skills compared to his own in the beginning. Sakura might also be dismissive of Naruto's feelings for her in a hurtful way, which could make Naruto feel isolated within the team.
There could be a fanfiction where Team Seven is brainwashed or under some sort of mind control. As a result, they turn on Naruto and attack him. This would be extremely hurtful to Naruto, both physically and mentally. He would be confused as to why his friends are suddenly trying to harm him and it would shatter his trust in them.
It could be that Anko is under some sort of mind - control in the fanfiction. And because of that, she attacks Naruto without really meaning to. Maybe she has been influenced by an enemy's genjutsu. So, she uses her powerful attacks on Naruto, and he gets hurt as a result.
Well, in certain fanfictions, Boruto may physically harm Naruto in a moment of being influenced by dark forces or in a fit of rage. This is often used to create high - drama situations. Maybe he's tricked into believing Naruto is a threat to something he holds dear, like his friends or the village, and so he takes action against him without realizing the truth.
At first, Naruto would be extremely hurt. He has always considered Team 7 as his family, so their betrayal would be a huge blow. He might go into a state of shock and disbelief.
Sasuke might become more withdrawn. He was always in a sort of rivalry with Naruto, and without Naruto there, he could lose some of his motivation to get stronger. Sakura would be devastated. She cared about Naruto, and his leaving would make her question what went wrong. Kakashi would also feel a sense of failure as a teacher.
In some fanfictions, Sakura might accidentally hurt Naruto during a training session. Maybe she uses a new jutsu she's not fully mastered and it goes wrong, hitting Naruto instead of the target.
Well, in some Narusaku fanfictions, Sakura might hurt Naruto emotionally by choosing Sasuke over him repeatedly. This can make Naruto feel rejected and unloved, causing him pain.
In some Sasunaru fanfictions, Sakura might hurt Naruto emotionally. For example, if she chooses Sasuke over Naruto in a very cruel way, it can break Naruto's heart. She could say mean things about his dreams or his past as an orphan, which would deeply wound him.
The writer can focus on Naruto's emotions. Show his shock and disbelief when the hurt occurs. For example, if Sasuke attacks him, describe how Naruto's eyes widen in horror, unable to believe that his friend would do such a thing. Use internal monologue to let the readers know how broken Naruto feels inside. Another way is to show the physical pain in detail, like if Sakura uses her medical skills to harm rather than heal Naruto, describe the pain as it courses through his body.
Well, the team's reaction can vary depending on the specific circumstances in the fanfiction. Sometimes they are angry, especially if they think the injury was preventable. They'll do whatever it takes to get revenge on the cause of Keith's hurt if it was due to an enemy attack. And they'll also be there for Keith during his recovery, sharing stories, and trying to keep his spirits up so he can heal faster.