One possible reason is copyright infringement. Parseltongue is a unique creation within the Harry Potter series. If a fanfic uses it without permission while charging, it's likely violating the copyright of the original work.
Well, it really depends on the context. If it's a case where someone is trying to make money off an unauthorized Parseltongue - related fanfic in the Harry Potter universe, it could be seen as wrong. J.K. Rowling and the associated rights holders have certain rights over the elements in the series. So, if it's without permission, a charge might be an issue.
One reason could be that the fanfic writer portrays Ron as overly jealous of Harry. In the original books, Ron has moments of jealousy but not to an extreme. If in the fanfic it's overdone, Harry might not be able to stand him. For example, if Ron is constantly trying to undermine Harry's achievements out of jealousy.
One great 'Harry Potter Parseltongue' fanfic is 'The Parseltongue's Secret'. It delves deep into the lore of Parseltongue and how Harry's ability to speak it affects his relationships and adventures. Another is 'Parseltongue: A Hidden Power', which focuses on the power dynamics within the wizarding world regarding Parseltongue speakers.
One reason could be a reaction to the Ministry of Magic's mismanagement. In the original story, the Ministry often made mistakes and had corrupt elements. In fanfiction, this could lead to Harry becoming an anarchist as a way to oppose such a flawed system.
One reason could be the strict control by the official copyright holders. They might be worried about fanfic diluting the official brand or misinterpreting the original story. Another factor could be some fans' purist view. They only want to stick to the original works by J.K. Rowling and consider fanfic as something not in line with the 'true' Harry Potter universe.
One reason could be to add more depth to his character. Schizophrenia can bring out complex emotions and behaviors, making Harry more relatable in some ways.
One unique element can be the exploration of the language itself. In some fanfics, the author creates new Parseltongue words and phrases, adding depth to the concept. For example, in 'The Mysterious Parseltongue', the main character deciphers an ancient Parseltongue prophecy that has words not mentioned in the original books.
In some Harry Potter fanfic, Parseltongue might be used to unlock hidden secrets in Hogwarts. For example, a character could use it to open a long - forgotten chamber that holds ancient magic items.
It could be a case of misinformation. Someone in the story might have spread false rumors about Harry being the father for their own motives. Perhaps they wanted to cause chaos or gain something from the situation. So, the whole idea of Harry being the father is just a false story that gets spread around the wizarding community.
One possible reason could be extreme despair. Maybe in that fanfic's alternate universe, Harry has lost all his friends and loved ones in a very tragic way, like a second wizarding war that was far more brutal and unforgiving. He might see no way out of the emotional pain and thus choose to end his own life.