Her parents would be very concerned. They would likely take her to the best doctors or use any resources they have to help her heal. Her mom might fuss over her, making her favorite foods and ensuring she gets plenty of rest. Her dad, on the other hand, might be more focused on finding out who or what caused her injury and making sure it doesn't happen again.
Her enemies might have different reactions. Some might see her injury as an opportunity to strike again and finish her off while she's weak. However, others might be a bit more complex in their reactions. They might respect her more for getting hurt in the line of duty and even have a moment of hesitation before continuing their attacks on her.
Ron would be extremely worried. He's her best friend and sidekick, so he'd probably be by her side constantly, trying to cheer her up and making sure she has everything she needs during her recovery. He might also be a bit overprotective at first, not wanting her to jump back into action too soon.
Inuyasha would likely be very angry and protective. He'd probably rush to her side immediately and vow to take revenge on whoever or whatever caused her harm. His reaction would be intense, as he has deep feelings for Kagome.
Other characters' reactions can vary widely. Some of the more empathetic classmates, like Tsuyu, might offer words of comfort and stay by his side. Mineta might be a bit more cowardly, but still show some concern. The teachers, such as Aizawa, would take charge of the situation. Aizawa would ensure Midoriya gets proper medical attention and also start an investigation if the injury was due to foul play. His mother, if she were to find out, would be extremely worried and rush to be by his side as soon as possible.
Anakin, if he's in the story, would likely be very protective. He might rush to her side immediately, using his skills to try and heal her or at least stop the bleeding. His reaction could be full of anger towards the cause of her injury, vowing revenge.
His friends, like Kai, would be very protective. Kai might get angry and rush into battle to avenge Lloyd's injury. Jay would probably be more worried and try to use his technical skills to find a solution to heal Lloyd.
Simon might be in a bit of a panic. Since he's her friend and also not as used to the dangerous situations as the other Shadowhunters. He'd try to do whatever he can to help, like getting help from more experienced Shadowhunters or trying to comfort Clary while she's in pain.
The other characters' reactions can vary. Pixal, if she's around, would use her technological knowledge to see if there are any internal damages to Jay, especially if it's related to his electrical components. The villagers of Ninjago might also show their support. They could bring food or offer shelter for Jay to recover. The reaction of the villains would depend on the situation. Some might see it as an opportunity to finish Jay off, while others might be impressed by his courage in getting hurt while fighting them.
Splinter, as their sensei and father figure, would offer wisdom and comfort. He might have some traditional methods to help with Donnie's pain and healing. And he would also use this as a teaching moment for all of his sons about the importance of caution and looking out for each other.
Kagome usually gets very worried. She'll immediately try to use her spiritual powers to heal him if she can. If not, she'll search for herbs or other ways to help. Miroku would likely offer his support in a more practical way, like finding a safe place for Inuyasha to rest. Sango might be on guard, making sure that no more enemies take advantage of Inuyasha's weakened state.
Yuki would likely be very concerned. He has a soft spot for Tohru and would probably rush to her side, trying to find a way to help. He might even blame himself if he thinks he could have prevented it. Kyo, on the other hand, would initially be angry, but that's just his way of showing worry. He would be more hands - on in getting her the help she needs.
The other characters' reactions can vary greatly. Some of the more powerful characters might see Atem's injury as a sign of weakness and try to take advantage. However, his true friends would rally around him. Bakura, in his good side, could offer some knowledge about ancient healing spells. Tristan would be the one to stand guard and make sure no further harm comes to Atem while they search for a solution. And the spirit of the Millennium Puzzle might also be actively involved in trying to heal Atem or guide the others on what to do.