Perhaps Dawson is hurt by a criminal while on a call outside of a fire situation. For example, she could be trying to help someone during a robbery gone wrong. This would introduce a different kind of danger and could lead to a story about her recovery and the hunt for the perpetrator, with her friends at the firehouse being very protective of her.
Casey would be a great choice. He has a close relationship with Dawson. He could be the one who stays by her side in the hospital, making sure she gets the best care. He might also be the one to encourage her during her recovery, using his own experiences to give her strength.
One storyline could be Dawson having to deal with morning sickness while on duty. She might try to hide it from her colleagues at first but then they find out and offer their support.
One possible scenario in such a fanfiction could be that Dawson gets hurt during a rescue operation. Maybe she is trapped under some debris while trying to save a victim in a burning building. Her fellow firefighters then have to race against time to get her out safely.
One common theme is their relationship development. Writers often explore how they fell in love, overcame obstacles in their relationship, and grew together. Another theme is action and adventure, like how they handle dangerous situations at work as a couple.
One possible storyline could be Maia getting hurt during a courtroom battle. Maybe she is physically attacked by an angry client or a witness. Another could be her being emotionally hurt when a close colleague betrays her trust. For example, they might leak some confidential information about her which causes her a great deal of distress.
She could be hurt while responding to a chemical fire. The chemicals could cause burns or respiratory problems for her. Her team would be desperate to get her the proper medical treatment, and there could be a struggle to find the right antidote or treatment method.
One possible storyline could be that Shikadai is on a mission and gets caught in an unexpected ambush by a group of powerful enemies. He might be outnumbered and sustain injuries while trying to fight them off and protect his comrades. Another could be that he's involved in a training accident that goes horribly wrong, like a jutsu backfiring on him and causing him physical harm.
Well, perhaps Spiderman is poisoned by a new type of toxin from a villain. The Avengers then scramble to find an antidote. Black Widow uses her espionage skills to track down the origin of the toxin, while Hulk, in his Banner form, tries to analyze it scientifically. Thor might also use his Asgardian knowledge to see if there are any magical cures. In the meantime, they keep Spiderman comfortable and safe from further attacks.
In some fanfictions, Sasuke might get hurt by a curse that was placed on him long ago. As he suffers, he has visions of his past, his family, and his mistakes. His struggle with the physical pain and the emotional turmoil of his past makes for a very engaging and complex storyline.
One popular storyline could be Neal getting injured during a dangerous undercover operation. For example, he might be caught in a fight while trying to infiltrate a criminal group and end up with a serious wound. This could lead to Peter being extra protective and worried about him.