It could be a new dark wizard or witch who has a vendetta against Harry. This person might have developed a new form of magic specifically to harm Harry, and the seizure is the first sign of this new threat.
One reason is that fans like to explore different perspectives. In the original books, Dumbledore is presented as a wise and mostly benevolent figure. But some fans want to see what would happen if he had a darker side. It adds a new layer of complexity to the story.
Well, a bad Harry Potter fanfiction could be due to bad world - building. In the Harry Potter series, the world of Hogwarts and the wizarding world is so richly detailed. If a fanfiction fails to capture that essence or creates a really inconsistent world, it's bad. For instance, if the houses at Hogwarts suddenly have completely different characteristics that don't align with what J.K. Rowling created. Additionally, if the fanfiction has a really forced or contrived plot device just to get to a certain point, like a deus ex machina that solves all the problems out of nowhere, it's a sign of a bad fanfiction.
One characteristic of bad Harry Potter fanfiction is poor character development. Instead of staying true to the complex and well - developed characters in the original series, they might make them act out of character. For example, making Harry extremely cruel or Hermione overly ditzy. Another is a lack of consistency with the established magic system. In the original books, the magic has rules and limitations, but bad fanfiction might have magic solving every problem too easily or in ways that don't make sense. Also, bad grammar and spelling can be a big giveaway, as it makes the reading experience difficult and unprofessional.
One factor could be a complete disregard for the established lore and characters in the Harry Potter universe. For example, if a fanfic makes Harry a completely different person with no resemblance to his original character traits, like suddenly making him extremely cruel for no good reason. It just doesn't fit with what we know and love about the series.
It can divide the fandom. Some fans might be open to new interpretations like Harry as a 'bad boy' and enjoy the creativity, while others who are purists might be very much against it. This can lead to arguments and a split in the community.
I think it's a bad take. In the official Harry Potter lore, Harry has always been on the side of light. He was the one who faced Voldemort, the ultimate dark wizard, multiple times and defeated him. To make Harry a dark wizard in a fanfic completely distorts the well - established character arcs and the overall positive message of the series.
Among the popular bad guys in 'Harry Potter bad guy fanfiction' are the Dementors. Their terrifying nature and the mystery surrounding them make them a great subject for fanfiction. Writers can delve deeper into their origins and what makes them so evil. Another is Nagini, Voldemort's snake. Some fanfictions might give her more agency and intelligence, making her a more significant and menacing villain. And Severus Snape, while he was a complex character in the original series who turned out to be on the good side in the end, in some fanfictions he is rewritten as a true bad guy, exploring the 'what if' scenario of his character being completely evil from the start.
A really bad Harry Potter fanfiction might be one where the author completely changes the personalities of the beloved characters. For instance, making Hermione mean - spirited when she's known for her kindness and intelligence in the original series. Bad grammar and spelling mistakes can also contribute to it being bad. Additionally, if the fanfiction tries to force a romantic relationship between characters that has no basis in the original story and does it in a cheesy or inappropriate way, it would be considered really bad.
One common characteristic is poor writing quality. This can include grammar and spelling mistakes that make the story hard to read. Another is the misrepresentation of the original characters. For example, making Harry Potter completely out of character by having him act in ways that go against his established personality in the official books. Also, bad fanfic might have really contrived plots that don't fit within the world J.K. Rowling created. They may introduce elements that are completely inconsistent with the magic system or the social structure of the wizarding world.