It could also be a form of revenge. Suppose he felt wronged by the wizarding society for some reason, like being falsely accused or seeing his friends suffer unjustly. Creating a plague might be his extreme way of getting back at them.
Maybe it was an accident. Harry Potter was experimenting with some dark magic (which he may have been forced into or just out of curiosity) and things got out of hand, resulting in the creation of the plague.
The Ministry of Magic would likely be in chaos. They would try to find a way to stop the spread and hold Harry Potter accountable. There would be a lot of panic among the wizards and witches, with many trying to flee or find a cure on their own.
There could be a lack of understanding of the Harry Potter universe. If someone doesn't fully grasp the essence of the magical world, they might think it's okay to introduce elements like gun running. Or perhaps they are trying to make a statement about modern - day problems by forcing them into the Harry Potter setting, but this is a very clumsy way to do so as it completely violates the integrity of the original series.
Yes, there might be. The Harry Potter fandom is vast and diverse, with fans exploring all kinds of scenarios in their fanfictions. A 'Harry Potter has a plague' concept could be someone's unique take on the wizarding world, perhaps exploring how the magical community would deal with a plague, or how Harry Potter specifically would be affected. However, it may not be a very common theme compared to others like Harry's battles with Voldemort.
The Plague Doctor could be a magical healer from a far - off land. His strange appearance and methods are initially met with suspicion in the Harry Potter world. But as the story progresses, his skills in dealing with diseases become invaluable. For example, he could use his beak - like mask not just for protection but also as a tool to channel magic for healing.
One interesting 'Harry Potter plague fanfiction' could be about how the wizarding world copes with a mysterious plague that affects magic. Maybe it shows the Hogwarts students trying to find a magical cure while dealing with the chaos and fear in the castle.
Another reason could be a build - up of years of pent - up anger and frustration. Snape has been harsh on Harry throughout his years at Hogwarts. Harry has had to endure Snape's unfair treatment, and all of that negative emotion could explode in a moment of extreme stress or danger, leading him to stab Snape.
If Harry were to create a Horcrux in fanfiction, it would likely lead to a great corruption of his soul. Horcruxes are dark magic, and the act goes against all that Harry stands for in the original series. He might start to show signs of increased aggression, a detachment from his friends, and a growing attraction to the Dark Arts.
One possible motive could be that the 'mountain' in the fanfiction represents a great evil or obstacle that is threatening the wizarding world. Harry, being the hero, feels it's his duty to eliminate it. For example, if the mountain is a lair for dark creatures that are attacking Hogwarts students.
One possible motive could be a misunderstanding. Maybe Snape is framed for something really bad, like a dark magic plot against Hogwarts. Harry, in his haste to protect the school and his friends, believes Snape is guilty and takes drastic action. Another reason could be if Snape accidentally endangers someone Harry loves dearly, like Ginny or Ron, and Harry's emotions get the better of him in the heat of the moment.
First, try searching on large fanfiction communities. Fanfiction.net has a huge collection of Harry Potter fanfictions. Just go to the site, enter 'Harry Potter has a plague' in the search bar. Another option is AO3. It has a more organized tagging system. Look for tags related to Harry Potter and plague. You might also want to check some Harry Potter - specific fanfiction forums where fans might discuss or share such unique fanfictions.