In fanfiction, Harry Osborn as Black Spiderman might bring a new dynamic to the story. His background as a rich and sometimes troubled character in the original Spider - Man story can add layers. For example, he could use his wealth in ways that a regular Black Spiderman might not. His family history and the influence of his father could play a role in his actions as a superhero. Also, his relationships with villains could be different. Maybe he has a more personal vendetta against some of them because of his family's past. And his relationship with Mary Jane or Gwen Stacy could be completely different from what we expect in the normal Spider - Man story.
Yes, there are many 'Harry Osborn' fanfics. You can find them on various fanfic websites like Archive of Our Own. There are different genres and themes related to his character, from friendship stories within the Spider - Man universe to his own adventures.
One good theme is his transformation. Fanfics can explore how he changes, like when he becomes the Green Goblin in some storylines. It can be interesting to see the internal struggle and how it affects his relationships.
A fanfic that stands out is 'Harry and Peter: The Unbreakable Bond'. It focuses on how they support each other. There are many scenes where they have heart - to - heart conversations that give a deep insight into their characters. The author does a great job of staying true to the essence of Peter and Harry in the original stories.
One great fanfiction idea could be Harry Osborn's internal struggle with his new - found powers in 'The Amazing Spider - Man 2'. He might be torn between using them for good, like Spider - Man, or for his own self - interests. For example, he could be constantly fighting the urge to use his powers to gain more control over Oscorp, while also being aware that Spider - Man's way of using powers is more noble.