Obviously, Harry, Hermione, and Ron could be main characters. They often get into trouble and end up in the Hospital Wing. They could be there to visit an injured friend or because they themselves are injured. Neville could also be a main character, maybe he discovers some new plants that have healing properties in the Hospital Wing.
New students could be the main characters in a 'Harry Potter Hospital Wing Fanfiction'. Imagine a first - year student who is really clumsy and is constantly in the Hospital Wing. They start to notice some odd things going on in there, like strange noises at night or objects moving on their own. And as they try to figure out what's happening, they meet other students who also have their own reasons for being in the Hospital Wing often.
In fanfiction, Harry Potter in the hospital wing might have strange visions. Maybe he sees the memories of other Hogwarts students who were once treated there. It could be a way for the author to introduce some hidden lore or backstories of the school.
Hermione would surely visit. She'd be there with a stack of books, ready to help Harry catch up on his studies while he recovers. And Ron would be right beside her, probably with some treats from the Hogwarts kitchen.
Obviously, Harry Potter himself could be one of the main characters. Maybe he's been through so much during the fight against Voldemort that he starts to have mental health issues and ends up in the mental hospital. Hermione would also be a likely main character as she would be trying to find a way to cure Harry using her vast knowledge of magic. Another could be Luna Lovegood. Her unique perspective on the world might make her either a patient who is wrongly diagnosed or a healer who has her own unorthodox methods of treating the mentally ill wizards.
Obviously, Harry Potter himself would be one of the main characters. He could be the one who first makes contact with the Gundam Wing pilots. And Heero Yuy from Gundam Wing could also be a main character. Heero's stoic and determined nature would make for an interesting contrast with Harry's more emotional and sometimes impulsive personality. They could learn from each other throughout the story.
Ron Weasley can also play an important role. He might be the one who accidentally causes an accident that sends someone to the hospital, and then feels really guilty about it. So he spends a lot of time in the hospital wing trying to make it up to the injured person, while also getting into some comical situations with the other patients and the Healers.
One idea could be a story where a new, mysterious illness spreads in the school and the Hospital Wing is overcrowded. Harry and his friends try to find the cause while also helping Madam Pomfrey. Another could be a story about a student who has a special power that is only revealed when they are in the Hospital Wing due to an accident.
Obviously, the Avengers themselves would be main characters. Iron Man could be the one who funds the high - tech medical equipment in the hospital. Thor might have a hard time adjusting to the human medical procedures. And Black Widow could be using her espionage skills to find out if there are any threats in the hospital.
Neville Longbottom could be a main character. He has always had the potential for great things and in a world without Harry, he would be likely to step into the spotlight. He has the courage and the connection to Hogwarts that could make him a central figure in the fight against evil.
Hermione could be one. She could come to Degrassi to help Harry. She'd be really good at handling the academic side of things there, like helping students with their studies. And also, she could use her magic knowledge to figure out any magical mysteries.
Harry, Hermione and Ron could be the main characters, exploring the mysteries of the mansion. Or perhaps a new generation of wizards, like the children of the original trio. Neville Longbottom could also be a main character, using his knowledge of plants to uncover secrets in the mansion's garden.