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.
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.
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.
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.
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.
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.
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.
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.
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.
Iruka would be concerned at first, thinking if Naruto is in some sort of trouble. But once he realizes it's just a situation, he would be more accepting. As for the other ninja in the village, some might be envious of Naruto's ability to pull off the girl look, while others might be confused and keep their distance until they understand what's going on.
Sasuke might be initially shocked and then try to act like he doesn't care. Sakura could either laugh hysterically or be a bit more empathetic and help Naruto adjust if it's not a prank situation. Kakashi would probably just give a knowing smile and make some light - hearted comment. Shikamaru would likely be too lazy to really react strongly, just a shrug and a muttered 'troublesome' under his breath.