It could be her best friend. Her best friend might have been looking for her when she heard Lily's cry of pain. Without hesitation, the best friend would run towards the sound and find Lily. Then, using whatever magic or physical strength they have, they would get Lily to safety and call for help.
Maybe it's a secret admirer. This person has been watching Lily from afar for a long time. When they see Lily get hurt, they can't bear it. So they step forward, their heart pounding, and use their skills (could be magic related or just their quick thinking) to rescue Lily. This could also be the start of a romantic storyline.
A teacher could be the one to rescue Lily. For example, the potions master who was nearby when the accident in the potions lab happened. The teacher has the knowledge and experience to deal with the situation immediately. They would quickly administer some basic healing spells and then take Lily to the proper medical facilities in the school.
Damon is very likely to be the one to rescue Elena. He has a deep connection with her and is extremely protective. His vampire abilities, like super speed and strength, make him well - equipped to fight off any threats and get her to safety quickly.
In a possible plot, Lily might be hurt during a quidditch match. Maybe she gets hit by a bludger and falls from her broom. Her friends then rush to her aid, and there could be a lot of worry and panic among them. They take her to the hospital wing where she recovers slowly while her friends stay by her side, showing the strong bond of friendship.
Alex is very likely to be one of the first to help Kara. As her sister, she has a deep bond with Kara and would do anything to protect her. Alex has medical training and combat skills, so she can both treat Kara's injuries and defend her if needed. Another character would be Winn. He is a tech - genius and could use his knowledge to create something to help Kara heal faster or to find a way to counter whatever caused her injury. Also, J'onn J'onzz, with his shape - shifting and telepathic abilities, could be a great asset in protecting Kara while she's injured and in helping her recover mentally as well as physically.
It could be a new, self - created villain. This villain might have been training in secret for years, specifically to defeat Goku. He could have studied all of Goku's moves and weaknesses and then launch a surprise attack that causes Goku to get hurt.
One likely character would be her closest friend. This person would be by her side immediately, providing emotional support and maybe even some basic first - aid if they are able. They would stay with her throughout her recovery process, being a source of comfort.
It could be an antagonist. Some villain who has a grudge against Toby or the group he is associated with. This villain might see Toby as an obstacle and deliberately target him to cause harm.
It's also possible that an unexpected character shows up to help. Maybe a mysterious stranger who has their own reasons for wanting to keep Jasmine alive. This stranger could have some unique abilities or resources that are crucial for her recovery.
Maybe in a fantasy fanfiction, an evil sorcerer is the villain. Christy might be a key figure in a prophecy to save the kingdom. So, the sorcerer tries to stop her by casting a spell that makes her get hurt. He doesn't want her to fulfill her destiny and will do whatever it takes to keep her from being a threat to his power.
A new emerging criminal who has a grudge against technology and those who use it to catch criminals. Garcia, being the tech genius, would be a prime target for them. They could plan an elaborate scheme to hurt her and disrupt the BAU's work.
It might be an accident - causing character. This could be someone who is clumsy or irresponsible. Their actions, even if not intentional, end up causing harm to Judy. For example, they might accidentally start a fire in a place where Judy is, and she gets burned in the process.