They are popular because it shows Hermione in a vulnerable state. Usually, she's so strong and in control, but when she's sick, it's a new side of her.
These fanfics are popular as they allow for a lot of character development. When Hermione gets sick, other characters get a chance to step up and show their caring side. For instance, Ron and Harry might have to take on more of Hermione's usual tasks, which creates interesting storylines. Also, readers get to see how the wizarding world deals with illness, which is different from the Muggle world.
The popularity might also stem from the fact that it adds a bit of realism to the magical world. Even in a world of magic, people can get sick. And seeing how Hermione, one of the most beloved characters, copes with being sick makes for an engaging read. It can also explore themes of friendship and support as her friends come to her aid during her illness.
There's a fanfic titled 'When Hermione Falls Ill'. In this story, it focuses on Hermione's internal struggle while being sick. She's not used to being incapacitated and it delves into her thoughts and how she copes. It's really interesting as it gives a deep look into her character even when she's not at her best. For example, she tries to continue her studies while sick but her body just won't allow it.
They're popular because it shows a different side of Harry. Usually, he's seen as the hero, but when he's sick, he's vulnerable. People like to see how the other characters react to this vulnerable Harry.
In this fanfic, Cleo getting sick could lead to some interesting plot developments. Maybe it shows how the other characters in H20 react to her being ill. They might have to take care of her, which could strengthen their relationships.
Another theme is the vulnerability of a strong character. Hermione is usually very intelligent and in control, but when sick, she becomes vulnerable. This allows for character development as she has to rely on others, and we see a different side of her. In many fics, she might have to accept help from unexpected characters.
Obviously, her best friends Sam and Freddie would visit her. They are always there for each other. Maybe Gibby would also come over with his unique brand of humor to try and cheer Carly up.
Her best friend Veronica would probably be one of the first to help. Veronica is wealthy and could use her resources to get the best doctors for Betty.
No, it is not ethical. Writing about rape in fanfiction is a very disturbing and inappropriate topic. It can be extremely triggering for survivors of sexual assault and it goes against basic moral values of respect and human dignity.
The 'inuyasha gets sick' trope is popular because it gives the characters a chance to show their caring sides. Kagome, in particular, gets to be more of a caretaker. It deepens their relationships and shows the bond between them. Also, it can be a source of drama and tension, as the other characters worry about Inuyasha's survival and what will happen if he doesn't get better soon.
One common theme is friendship. When Ash gets sick, his friends usually rally around him. For example, Pikachu might stay by his side constantly, and his human friends like Misty and Brock would try to find remedies or take care of him. Another theme could be vulnerability. Ash is often seen as a strong and determined trainer, but when he's sick, it shows his more vulnerable side.
I'm not entirely sure specifically as it could be a very niche or even a made - up fanfic title. It might be a fan - created story related to some sort of 'selection' process in an 'America gets sick' scenario. Maybe it's about a selection of people to deal with a disease outbreak in America in a fictional and creative way.