In this 'jace gets sick fanfiction', Jace is the one who gets sick, of course. But there might also be his family members. For example, his mother could be a very important character, hovering over him, making sure he takes his medicine and gets enough rest. And perhaps there is a wise old doctor in the story, who tries different remedies to cure Jace.
In the 'jace gets sick fanfiction', it might involve Jace getting a mysterious illness. This leads to a search for a cure, with his family and allies scouring the land for rare herbs or magic spells to heal him. They face many challenges along the way, such as dangerous creatures guarding the ingredients they need.
Toriel is very likely to be involved. She has a motherly nature and would surely be concerned about Frisk's health. She would probably be at Frisk's bedside, offering comfort and warm food.
Obviously, Percy would be the main character as the story is about him getting sick. But his friends like Annabeth and Grover would also be important characters. They would be the ones trying to help Percy get better, so they play a big part in the fanfiction.
Mario would most likely be a main character too. He's Luigi's brother, so he'd be there to take care of him or at least be really worried about him. Princess Peach could also be a main character. She might visit Luigi when he's sick and bring some kind of magical item that could potentially help him get better.
Obviously, Bendy would be one of the main characters since he's the one getting sick. His friends like Boris and Alice would also be main characters as they would likely be involved in taking care of him or finding a cure.
All Might is another character that is very likely to appear. As Deku's mentor, he has a big influence on him. He would be concerned about Deku's health in relation to his quirk. Recovery Girl, the school nurse, would also be an important character. She would be the one trying to diagnose and treat Deku's illness.
Joho is the main one for sure. But there could also be a love interest. Maybe someone who has always had feelings for Joho and uses this time when he's sick to get closer to him and show their care.
There might be a kind - hearted doctor in the 'baby bella gets sick fanfiction'. The doctor would examine Baby Bella carefully, give accurate diagnoses and prescribe the right medicine. Also, her best friend could be a character. Her friend might visit her often and bring her favorite toys or books to make her hospital stay or time of being sick at home more bearable.
Sonic himself, of course. And his best friend Tails is very likely to be there. Tails is always by Sonic's side and would surely be there when Sonic is sick.
Well, consider Hamilton's son. He would be scared and confused, not fully understanding what's happening to his father. He might try to be brave and do little things to make Hamilton feel better, like drawing pictures for him. Hamilton's friends in the military, like Laurens, if he were still alive in this fanfiction, would be ready to defend Hamilton from any potential threats during his illness. They would be on high alert because they know Hamilton has enemies. And the ordinary people who have been inspired by Hamilton's ideas would be praying for his recovery and sending well - wishes, which would add to the sense of Hamilton's importance in the community.