Iruka - sensei could be an interesting option. He was Naruto's first teacher and has always had a soft spot for him. He would bring the warmth and comfort of a father figure. He might not have the advanced medical skills like Sakura, but he would stay by Naruto's side, tell him stories to keep his spirits up, and do whatever he can to help Naruto get better.
In fanfiction, it could be her best friend. Her best friend would be really worried and would stay by her side all the time. She would make sure Bella takes her medicine, gets enough rest, and has something to eat and drink.
His friends might first notice that Naruto is not his usual energetic self. Sakura, being a medic - in - training, would likely check his temperature and use her medical knowledge to try and bring down the fever. Sasuke, though not as outwardly expressive, would probably stay by Naruto's side, ensuring his safety while Sakura works on treating him. Shikamaru might use his intelligence to figure out what caused the high fever in the first place, perhaps by retracing Naruto's steps in the previous days.
Sasuke, although he may not show it openly, would stay by Naruto's side to protect him. He could bring him water and make sure he is comfortable, while also being on guard in case of any threats.
Well, in some fanfictions, Harry Potter with a high fever could be more vulnerable to dark magic attacks. His friends would be very worried and might try all kinds of magic to cool him down and heal him. Hermione would probably be scouring through all her books to find a solution while Ron would be pacing nervously, waiting for Hermione to come up with something.
It could be due to over - exertion during a difficult mission. Naruto often pushes himself to the limit, and this time it might have taken a toll on his body, resulting in a high fever.
One common theme is friendship. When Naruto has a high fever, his friends always come to his aid, showing the strong bonds in the Naruto world. For example, they might bring him medicine or stay by his side to protect him.
Maybe he was poisoned during a battle. The poison could be slowly affecting his body and causing a fever as his body tries to fight it off. In fanfiction, the poison could be something unique created by an enemy ninja with special properties.
One idea could be that Naruto gets a high fever right before a crucial mission. His friends, like Sakura and Kakashi, have to figure out how to complete the mission without him or find a way to get him better in time. Another plot could involve Naruto's high fever causing him to have strange dreams that give him insights into some hidden jutsu or mystery in the ninja world. Maybe his fever is the result of a new enemy's attack, like a poison that also affects his chakra flow, and the story could revolve around finding the antidote and defeating this new threat.
In such a fanfiction, Naruto might be really weak and vulnerable. His friends could be very worried about him. Sakura, as a medic - ninja, would probably be the first one to check on his condition and try to bring his fever down with her medical skills.
In the fanfiction, Naruto might have a fever due to overusing his chakra. When he pushes his body to its limits in intense battles or during extensive training, it could strain his body and cause a fever.