Mulan's family, if they knew she was hurt, would be extremely worried. Her father would feel guilty for sending her in his place. Her mother would be busy preparing remedies and praying for her recovery. And her little brother would be eager to do whatever he could to help, like fetching water or gathering firewood for her comfort while she heals.
Li Shang would probably be very concerned. He might blame himself for not protecting her better. He would immediately call for the best medical help available and stay by her side until she recovers.
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.
Beast Boy would definitely be one of the first to react. He and Raven have a special bond in the Teen Titans, so if Raven gets hurt, he would be extremely worried. He might use his shape - shifting abilities to quickly get to her side or try to find help.
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.
One possible plot could be that Mulan gets hurt on her way back home after the war. She might encounter bandits and get injured while defending herself. This would delay her return home and add more challenges to her journey, like finding shelter and treatment in an unfriendly area.
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.
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.
If Jules has a family member in the Flashpoint story, they would have an extremely strong reaction. They would rush to her side in the hospital, if it comes to that. They might even try to convince her to leave the dangerous job. Their reaction could add an extra layer of drama to the fanfiction, as Jules would have to balance her family's concerns with her own dedication to her work.
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.
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.
His friends would likely be very concerned. They might immediately rush to his side to check on his injuries. For example, they could call for medical help or try to stop any bleeding if it's a more serious wound. They would also offer words of encouragement and support, telling him not to worry and that he'll get better soon.