One idea could be to explore Harry's life during the summers at the Dursleys in a more in - depth way. Maybe he discovers a hidden magic within the Dursley's house that has been suppressing his true power all along.
Explore their relationships in depth. If a character has a complex relationship with their family, like being disowned for not following the family's dark magic practices, it will add layers to their character. Also, show how they interact with different Hogwarts houses. A character who doesn't fit neatly into any one house's stereotype but has qualities of all of them can be very interesting and unique.
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.
It could be because some fanfiction writers want to take a different approach and create a new storyline where Harry's role or perception is challenged.
Often, such fanfics explore alternate universes and reimagine the magical world. The new character might face different challenges and have different relationships with other characters.
Harry Potter is children's literature because it is a very popular novel. It tells the story of an orphan, Harry Potter, growing up at Hogwarts School of Witchcraft and Wizardry. He met many magical creatures and magic teachers, learned magical skills, and participated in a series of adventures. This story is very popular with children because it is full of imagination and adventure.
Well, it could be that some people think it goes against the original essence of Harry Potter. The original series portrays Harry as a heroic figure, and if the fanfiction makes him a 'bad boy' in a way that distorts his character values, it might be considered bad. For example, if it has him engaging in unethical or out - of - character behavior just for the sake of being edgy or different.