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.
The Hokage at the time, whether it's Tsunade or someone else, would likely get involved. They would allocate resources and ensure that the best medical care is provided. Additionally, some of the older ninja who knew Kakashi since he was young, like Iruka, might offer moral support and assist in any way they can, like gathering information or running errands related to his treatment.
Bobby could also be a key figure. He's like a father figure to the boys and has a wealth of knowledge. He might know of some old remedies or be able to point them in the right direction to find a way to heal Dean. Charlie could also pitch in. She's smart and resourceful and could use her hacking skills to find information related to Dean's injury.
His teammates are very likely to help. Kagami, for instance, might push him during rehabilitation exercises in a tough - love kind of way. The other members of Seirin could also offer moral support, like bringing him his favorite snacks or just spending time with him. His coach too could be involved, providing expert advice on how to come back stronger.
Hermione would definitely be one of the first to help. She's extremely intelligent and well - read in magic, so she'd quickly start looking for spells or potions to heal Harry. She'd also stay by his side to comfort him and keep his spirits up.
Dr. Bruce Banner could play an important role. His scientific knowledge could be used to analyze Captain America's condition and come up with solutions. In some fanfictions, he might even find a way to enhance Captain America's healing abilities. Also, Thor, if he's around, could use his Asgardian magic or knowledge to help in the healing process, perhaps by bringing some rare Asgardian herb or elixir that has healing properties.
Nobara Kugisaki and Megumi Fushiguro could also be among those who help. Nobara is a strong - willed and capable sorceress. She would be concerned about Nanami's well - being and use her skills to assist him. Megumi, being a calm and intelligent sorcerer, would likely come up with a plan to rescue or heal Nanami. They all share a sense of comradeship within the Jujutsu Kaisen world.
Lisbon would probably be the first one to help. She has a deep connection with Jane and cares about his well - being.
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.
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.
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.