The other characters' reactions could vary widely. His close friends in the fanfic might be in a state of panic, crying and not knowing what to do. Enemies, on the other hand, might see it as an opportunity to take advantage, or they could also be secretly worried depending on the complexity of their relationships. And there could be those characters who are just bystanders, shocked at first and then trying to figure out what happened.
Sasuke would likely be conflicted. On one hand, he and Naruto have a deep bond, but on the other, Sasuke has his own ideas about justice. He might try to stop Naruto at first, reasoning with him. If that fails, he could be forced to choose a side, either to support Naruto's cause if he believes there's some merit to it, or oppose him to protect the shinobi world as he knows it.
Harry would be extremely worried. He'd probably rush to her side immediately and try to do whatever he can to help. He might blame himself for not being there to protect her. Ron, on the other hand, would be in a state of shock at first and then would try to use his humor to lighten the situation a bit while still being very concerned. Hagrid would be devastated. He sees Hermione as one of his students he cares about, and he'd likely bring some sort of magical creature - related remedy, thinking it could help.
Well, the other students in Gryffindor would likely be a bit taken aback at first. But then, knowing Hermione's intelligence and her tendency to be different, they would probably accept it. They might be curious about how she's going to manage to keep up the charade. The Hufflepuffs would be generally kind and understanding, perhaps even offering to help her if she needs it. The Ravenclaws would be intrigued by the idea and might study her transformation from a more academic perspective. The Slytherins, as a whole, would be more likely to try and use her disguise against her, either by blackmailing her or trying to expose her in a way that would cause her and her friends embarrassment.
His Aunt May would be extremely worried and would probably fuss over him, making sure he takes his medicine and rests. Ned would be constantly by his side, bringing him things from school or just keeping him company. MJ might be a bit more stoic on the outside but would also show her concern in her own way, like bringing him books to read while he recovers.
Edward would be extremely distraught. He might blame himself for not being there to protect Bella. He would likely stay by her side constantly, using his vampire abilities to try and heal her if possible. Alice, on the other hand, might have seen the accident coming in one of her visions but was unable to prevent it. She would be filled with guilt and would try to use her visions to figure out how to help Bella recover.
Harry would probably be very suspicious. He has always seen Draco as a bit of a bully and an enemy. He might think that Draco is up to something and try to warn Hermione to be careful. Ron, being more hot - tempered, could be quite angry. He might not understand how Hermione could even be in a situation where Draco kisses her. He might even lash out at Draco without really thinking about it. Ginny, on the other hand, might be more open - minded. She could see that there might be more to the situation than meets the eye and encourage Hermione to figure out her feelings before making any rash decisions.
Ron could have a more comical reaction at first. He might laugh and make some jokes about it, but then when he realizes it's important to Harry or that it serves a purpose, he would come around and be protective of Harry in his new attire. For example, if other students start to bully Harry for wearing the dress, Ron would stand up for him.
Zabuza would probably be initially shocked. He might see it as a complication to their plans, but as time goes on, he could become protective. Naruto, being the kind - hearted person he is, would likely offer his support and friendship. He might not fully understand Haku's situation at first, but he would try to be there for her.
The other characters' reactions would be quite diverse. For the more competitive male players, they might see this as an advantage or a disadvantage depending on their relationship with Kirito. If they were rivals, they might think it's a chance to outdo him now that he's a girl. But if they were friends, they would offer support. Female characters like Silica might be excited to have another girl around and might start sharing girl - only things with Kirito. The guild members of Kirito's previous guilds would likely be confused but still accept him, after all, they know it's still Kirito inside.