Yes, there are likely fanfics out there with such a wild and unorthodox concept. Fanfic writers often come up with very creative and out - of - the - box ideas, and this is definitely one of them. It goes completely against the established canon of the Harry Potter series, but that's the beauty of fanfiction. It allows for exploring different 'what - if' scenarios.
Sure, there could be. Fanfiction is a vast and diverse realm where authors can play with the established universe in various ways. The idea of Harry being Voldemort's son is extremely non - canonical but that doesn't stop fans from creating stories around it. It might involve exploring how Harry would grow up differently if he were Voldemort's son, how his magic would be affected, and how his relationships with other characters like Dumbledore or Hermione would change.
There probably is. Fanfic communities are full of all kinds of strange and interesting ideas. This one would be a really radical departure from the original story. In the official lore, Harry Potter is Voldemort's archenemy, not his son. But in the world of fanfic, writers can rewrite relationships and backstories as they please. They might explore how such a relationship could change the entire plot and character dynamics.