When Hazel gets hurt on the Argo 2 in fanfiction, it's a big deal for the other characters. Each of them has their own way of reacting. Jason, for instance, would use his leadership skills along with Percy to keep the crew in order. Nico, Hazel's brother, would be extremely worried and might even use his powers to try and find a way to heal her if possible. The whole crew would come together, their individual relationships with Hazel and each other playing a role in how they respond to her injury. They would support her both physically and emotionally, showing the strong bond among the characters on the Argo 2.
She might be unable to perform her normal duties on the ship. For example, if she's in charge of some magic - related tasks, her injury could disrupt the magical balance or protection on the Argo 2.
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.
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.
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.
Jay would probably be very vocal. He'd be shouting for help and freaking out a bit. Kai would be angry at whoever or whatever hurt Zane and be ready to fight back immediately. Lloyd, being the leader, would try to stay calm on the outside but be very worried inside and start coming up with a plan to help Zane.
Thorin would probably be very concerned. Since Bilbo has become an important part of their group, Thorin might feel responsible for his safety. He could order the others to help Bilbo immediately and make sure he gets proper care.
Natasha Romanoff would likely be very protective. She and Clint have a long - standing friendship and partnership. So, she would probably be by his side immediately, using her skills to tend to his wounds if possible, and vowing revenge on whoever hurt him.
Piper might be very worried and use her charmspeak to try and keep Jason calm. Leo could use his mechanical skills to build something to help with Jason's injury, like a makeshift stretcher or a device to monitor his condition. Annabeth would probably come up with a strategic plan to get Jason to safety and figure out how to heal him.
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.
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.