It could also be related to the idea of existential pain. If the light novel has elements of a character struggling with their purpose or place in the world, that internal turmoil and pain can be very distressing, causing the hatred of such a state.
One possible reason could be physical pain endured by the characters in the light novel. For example, if they are in a battle - wounded and suffering. It's a natural human (or character) reaction to dislike pain as it's uncomfortable and can limit one's abilities.
Well, it might start with a simple statement from a character about not liking pain. Then, as the plot unfolds, we could see the character take actions to avoid pain. For instance, if it's a fantasy light novel, they might use magic to heal themselves quickly or avoid dangerous situations that could cause pain.
One reason could be the aftermath of his battles. For example, the physical and mental scars from fighting Voldemort. He might be in pain from the Cruciatus Curse that some dark wizards in the fanfiction might use on him. Another reason could be the loss of his loved ones. Losing Sirius, Dumbledore, and others could cause him deep emotional pain that manifests in the fanfiction as a constant ache.
The writing quality in some Pokemon fanfic could be really poor. There might be bad grammar, inconsistent plotlines, or just a general lack of creativity that makes you dislike it. For example, some fanfics just reuse the same old ideas over and over again without adding anything new or interesting to the Pokemon universe.
One reason could be that some fans are very purist about the original Naruto story. They might feel that fanfiction often distorts the characters or the plot in ways that go against the essence of what Naruto is all about. For example, changing a character's personality completely to fit a romantic or dark and edgy narrative that doesn't align with the source material.
One possible reason could be that she stole something from the narrator, like a boyfriend or an important opportunity. Another reason might be that she constantly bullies the narrator or makes fun of them.
He might dislike it because it can create false expectations. Fans read fanfiction and might start expecting the real Avengers to act in a certain way that is not in line with their true nature.
One possible reason is that yoh might find the creativity in human fanfiction to be unoriginal. A lot of fanfiction tends to follow similar patterns or tropes, and yoh could be tired of seeing the same old ideas recycled over and over again.
One reason could be that the fanfic distorts the characters he knows well from Gryffindor. For instance, if it changes the personalities of his friends in Gryffindor in a way that doesn't seem right to him.
Maybe the fanfic often misrepresents the nature or relationship of Bellatrix and Rodolphus. For example, if in the original they are portrayed as very dark and loyal to a certain cause, but fanfic makes them out to be something else entirely, like soft or good - hearted, it could lead to dislike. Also, some people who are die - hard fans of the official story just don't like the idea of others taking creative liberties with their beloved characters.
Another possibility is that he doesn't like how some fanfictions over - sexualize the characters. In some cases, fanfiction can turn into something inappropriate, and Harry, who has a more pure view of his friends and the wizarding world in general, would be disgusted by this. He wants to preserve the integrity of the relationships and the world as he knows it.