They contribute by expanding the universe. Fanfics can take the existing world of Harry Potter and add new stories, characters, and relationships. For example, in a Professor - centered fanfic, we might see the backstories of professors that were only hinted at in the original books.
These fanfictions contribute to the fandom's creativity. Fans get to create their own versions of the wizarding world where James and Harry's relationship can be whatever they want it to be. It could be a more mentor - like relationship, or a very close friendship that defies the normal boundaries of time and space. This creativity spreads among the fandom, inspiring more people to write their own stories or create fan art based on these ideas.
They add new elements. For example, new types of magical flowers can expand the flora of the wizarding world. It gives more depth to the already rich environment of Hogwarts and the places around it.
Fanfictions about 'Harry Potter Masters Law' often expand the universe by creating new power dynamics. If there are laws that govern who can be a master of certain magics, it can change the relationships between characters. For instance, if a character is restricted by these laws from using a powerful magic, they may have to find alternative ways to achieve their goals. This can lead to new alliances and rivalries. Moreover, the exploration of these laws can also bring in new magical concepts and creatures that are related to the enforcement or violation of these laws, thus making the Harry Potter universe even broader.
Fanfictions in this regard also give a voice to minor characters. Cho Chang is not as central in the original books as Harry. Through these fan - created stories, her character can be developed further, and her relationship with Harry can be explored in ways that J.K. Rowling didn't have the space or inclination to do. This enriches the overall fandom experience.
They expand the universe. By introducing new relationships between Harry and various creatures, it gives fans more to think about and discuss. For example, if there's a fanfic about Harry and a Phoenix, it can add new layers to the concept of rebirth and magic in the Potterverse.
They add a new perspective. By focusing on puberty, 'Harry Potter Puberty Fanfic' can show the characters in a more relatable way. Fans can see the magical world through the lens of the characters' teenage struggles, which is different from just the main plot of fighting Voldemort. It makes the characters seem more real.
They add new stories. By focusing on Harry's children, they can introduce new plots, like new villains or new magical artifacts. For example, a fanfiction might have Harry's son find an ancient wand with powers not known before.
No. In the original 'Harry Potter' series, the Dursleys are presented as Muggles who dislike anything related to magic. Fanfiction is a concept more associated with fans of the series, and the Dursleys would have no interest in it.