In this kind of fanfiction, some characters may react based on their pre - existing relationships with Naruto. Tsunade, as the Hokage, would ensure that Naruto gets the best medical treatment available. She might order her best medical ninjas to attend to him. Jiraiya, if he were still alive in the fanfiction, would be a source of great comfort. He'd probably tell Naruto stories of his own adventures to keep his spirits up. And the other young ninjas in Naruto's generation, like Kiba and Shino, might offer to take on Naruto's tasks around the village temporarily so that he can focus on getting well.
The other characters' reactions can vary greatly. For example, Iruka-sensei would likely be very worried. He has always been like a father figure to Naruto. So he might bring Naruto his favorite food from the market and sit by his bedside, reminiscing about Naruto's growth over the years. Shikamaru, being the lazy but intelligent one, might use his brains to think of ways to cheer Naruto up. He could come up with a plan to gather all of Naruto's friends for a surprise visit when he starts to feel a bit better. And Hinata, she would be extremely shy but also very concerned. She might secretly knit a scarf for Naruto to keep him warm while he's ill.
Well, in many fanfictions, characters like Sakura might immediately take on a more nurturing role. She could be seen gathering medical supplies and constantly checking on Naruto's condition. Kakashi, on the other hand, might show his concern in a more understated way. He could be by Naruto's side, offering quiet words of encouragement or just being there as a reassuring presence. Sasuke might initially seem aloof but could end up showing his care in his own unique way, perhaps by secretly training extra hard to protect the village while Naruto is sick.
The village elders would also be concerned. They might start to think about the future of the village without Naruto. Some might even start looking for a temporary replacement for him as Hokage, which could cause some internal conflict in the village as not everyone would agree on who should take over.
Sakura, being a medical ninja, would immediately start examining Naruto. She'd be very worried and use all her skills to try and diagnose the illness. Sasuke, on the other hand, might not show his concern openly but would be constantly on edge. He might secretly look for ways to help Naruto get better. Shikamaru would probably start thinking of strategies to keep the village safe while Naruto is sick.
The other characters' reactions could vary. Some of the more hot - headed gang members might initially be impatient about Ponyboy being sick and not being able to participate in their activities. But as they see how serious it is, they would come around. The Socs, if they knew, might not care much on the surface, but there could be a few who feel a bit of sympathy, especially if they start to see Ponyboy as more than just an 'outsider'. And the girls in the story, if there are any, would probably be very motherly and bring things like soup and warm blankets for Ponyboy.
In this kind of fanfiction, Kakashi would probably make sure Naruto is comfortable first. He might tuck Naruto into bed, just like how a caring mentor would do. Then, he'd likely prepare some warm soup for Naruto to help him get better.
Naruto would be extremely devastated. He sees Kakashi as a mentor and father figure. He might go into a period of deep depression at first, but then turn his grief into motivation to become stronger. Sakura would also be very sad and might focus more on her medical skills, vowing to save more lives in Kakashi's memory. Sasuke might have a more internal reaction, feeling guilty if Kakashi died protecting him, and it could further fuel his own goals, whatever they may be at that time.
Leo would likely take charge. He'd be calm on the outside but worried inside. He'd make sure Donnie gets proper rest and tries to organize the others to help. Raph might be a bit gruff at first, but he'd actually be really concerned. He might offer to get supplies or guard Donnie while he sleeps. Mikey would be the most emotional. He'd probably be constantly by Donnie's side, trying to tell him jokes to make him feel better.
The teachers, especially Aizawa, would also be worried. Aizawa might give Bakugou special permission to skip classes or training until he's recovered. He'd also keep an eye on Bakugou's progress and make sure he's taking care of himself.
In most 'Naruto gets sick' fanfics, his friends are very concerned. For example, Sakura will immediately start using her medical skills to diagnose and treat him. Sasuke, although he may not show it outwardly as much, will stay by Naruto's side and keep a watchful eye. Shikamaru might come up with plans to make Naruto more comfortable during his illness. And Hinata, she would be really worried and would probably bring Naruto some home - cooked food to help him regain his strength.
Abby would be all over Tony, bringing him some of her special energy drinks (even though they might not be the best for a sick person). She'd also use her skills to try and find out what's wrong with him in a more scientific way. Ducky would of course offer his medical expertise, and might even tell some long - winded stories while examining Tony to try and keep his spirits up.
Zuma would probably offer to keep Skye company near the water, as he loves the beach. He could tell her funny stories about his underwater adventures to make her laugh. And Ryder would be in charge of making sure Skye gets proper medical attention. He'd be constantly checking on her and making sure she has everything she needs.