The other dragon riders could also be in the fanfic. Fishlegs could use his knowledge of dragons and other lore to figure out if there's a dragon - related way to heal Astrid. Snotlout might initially seem more concerned with his own status but would probably end up helping in his own way, perhaps by providing some muscle when needed for tasks related to Astrid's care.
Misty would also be there to help. She's tough and resourceful. She might use her water - type Pokemon to cool down any burns if Ash has them, or to create a barricade against any approaching danger. Professor Oak could also play a role. He has a lot of knowledge and resources. He might send over some special medicine or a flying - type Pokemon to quickly transport Ash to his lab for proper treatment.
There could be a mean - spirited colleague named Mark. He might constantly make snide remarks about Astrid's work or appearance, which would add to her discomfort. Another character could be a nosy neighbor, Mrs. Thompson. She always pries into Astrid's personal life, asking inappropriate questions and making Astrid feel awkward. And then there could be a clumsy acquaintance, Jake, who always seems to get in Astrid's way and cause embarrassing situations for her.
Sakura would definitely be involved. As a medical ninja, she would be at the forefront of trying to heal Naruto. Sasuke might also be there, either helping in the fight that led to Naruto's injury or coming back to the village to see his old rival. Kakashi would also be around, using his experience to strategize how to protect Naruto while he's injured.
One common plot line could be Astrid getting injured during a battle or an accident. Then, her friends might rally around her to help with her recovery. For example, they could bring her food, keep her company, and assist her with any tasks she can't do on her own while she's injured.
Even some of the antagonists could potentially help Jaune if there is a complex relationship developed in the fanfiction. For example, if an enemy realizes that Jaune's death or continued injury would disrupt some sort of balance, they might step in to heal him, albeit reluctantly.
Sakura is a very likely character. As a skilled medical ninja, she has the knowledge and ability to treat Naruto's injuries. In many fanfictions, she is often the first to rush to his side and use her medical jutsu to stabilize him.
Sasuke is very likely to be involved. Given their complex relationship, Sasuke could be the one who finds Naruto severely injured and has to make a choice between helping him or leaving him. Another character could be Sakura. As a medic - ninja, she would be the one to try and heal Naruto's severe injuries. Kakashi too might be involved, either as a mentor figure who tries to figure out what happened to Naruto or as someone who has to step in to protect Naruto from further harm while he is injured.
Gil could also be there to assist. He's Harry's friend and fellow crewmate. Gil is not as clever as Harry in some ways but he's very loyal and strong. He would do things like fetch water, find food, and stand guard while Harry is recovering.
Love can also be a theme. Sometimes her injury makes her realize the depth of someone's love for her, or she discovers new feelings for someone as she is being cared for. In 'Astrid's Heart Amidst Injury', her injury leads to a romantic revelation. Additionally, the theme of self - discovery is present. Through the experience of being injured, Astrid learns more about herself, her limits, and her capabilities.
The protagonist is very likely to complain in disappointment. They usually have high hopes and big dreams in the story. So when things don't go their way, like failing to defeat the villain or losing a loved one, they would complain. For example, in a superhero fanfic, if the superhero protagonist fails to save the city from destruction, they will be disappointed and complain about their lack of power or the unfairness of the situation.