There really shouldn't be. Harry Potter is a story aimed at a wide range of audiences, including children. The 'perverted daddy' concept is not only against the spirit of the original work but also can be considered offensive. Fanfiction is supposed to be a creative expansion of the original story in a positive way, not something that involves abnormal and inappropriate content.
Yes, there might be some extremely dark and out - of - canon fanfictions out there with such a disturbing premise, but it goes against the general nature of the original story where Harry's parents loved him deeply. However, in the vast world of fanfiction, people can create all kinds of strange and often inappropriate scenarios.
One possible reason could be that he might feel abandoned. Growing up without them, he could resent the fact that they left him an orphan. He might think that if they were really so great, they would have found a way to survive and be there for him.
In Harry Potter fanfiction, parents can be portrayed in various ways. Some are shown as overprotective, like Molly Weasley who is fiercely protective of her children in the original series, and this trait might be exaggerated in fanfiction. Others could be absentee parents, perhaps too busy with their wizarding jobs or studies to be fully present in their kids' lives. For example, in some fanfics, pure - blood parents might be preoccupied with maintaining their family's status in the wizarding world.
In addition to the Potters themselves, there are often original characters created for the fanfiction. For example, there could be a wizard or witch who was friends with James and Lily at Hogwarts but was not mentioned in the original books. These characters can bring new plotlines and perspectives. Voldemort is also a crucial character in many of these fanfictions, as his actions are directly related to the fate of the Potter parents.
Definitely not. The story of Harry Potter has a certain moral framework. His parents' love and sacrifice are what shape Harry's character and his journey. A fanfiction with such a concept distorts that and can be seen as disrespectful to the original work and its fans.
It can contribute by adding new perspectives. For example, it might make fans think about the parents' generation in a way they hadn't before. But it also needs to be done tastefully.
On a more magical level, reviving the dead is against the natural order of things in the wizarding world. This could attract unwanted attention from magical authorities or even dark forces. Some might see Harry's act as a dangerous precedent and try to either stop him or use his new - found power for their own evil purposes.
In some fanfictions, Harry might use extremely powerful and ancient magic. Maybe he discovers a long - lost spell during his adventures that has the power to reverse death. For example, he could find a spell hidden in a forgotten corner of the Hogwarts library that was created by a powerful wizard in the past but was deemed too dangerous to be used.
There could be old friends from their school days. For instance, a classmate who knew some deep secrets about them. Maybe this friend was also in the same secret club or society that his parents were part of, and after their deaths, this friend tried to keep an eye on Harry from the shadows.