They're popular because they offer an alternative view. People like to see what could happen if a main character breaks away from the traditional path. It gives a sense of freedom and exploration.
There might be a fanfiction where Hermione drops out. She could start her own magical research institute independent of Hogwarts. In this story, she might discover new spells and ways of magic that Hogwarts has overlooked. She could also recruit other dropouts or those who feel unappreciated at Hogwarts to join her in this new endeavor.
Many readers enjoy seeing a different take on the story. In the original series, Harry's friends play a huge role. So, when they're removed from the equation in fanfictions, it allows for a fresh exploration of the magical world. It can also show how self - reliant Harry can be, which is an appealing trait.
The popularity also lies in the fact that Lily represents a great deal of love and sacrifice in the Harry Potter universe. Fans like to explore how that love would have directly affected Harry as he grew up. They can create stories where Harry gets to know his mother better, and it gives a more complete family dynamic that was missing in the main series. Also, it allows for different interpretations of Lily's character and her magic, which is always interesting for fans to read about.
They are popular because the Dursleys are such complex and disliked characters in the original series. Fanfictions give readers a chance to explore their motives and potentially redeem them. For example, we can understand why they treated Harry so badly in some fanfictions which might be due to their fear of the unknown world of magic.
They're popular because it gives readers a different perspective on Harry's character. Instead of the typical Hogwarts - bound, often restricted Harry, an emancipated Harry has more agency. It allows for new storylines that deviate from the original and can be more exciting.
They're popular because they add a new layer of depth to the characters. We get to see how the beloved 'Harry Potter' characters handle pain and adversity, which makes them more relatable.
Another reason is that Ginny herself is a very interesting character. She's strong, independent, and has her own story. Fanfictions that focus on Harry and Ginny can give more spotlight to Ginny's character and how she complements Harry. This combination of two beloved characters in different and creative storylines is what makes these fanfictions so appealing to a wide range of Potter fans.
They're popular because it's fun to see a different side of Harry. In the original books, he had his struggles, but in these fanfictions, he's often in control. It gives a sense of power and satisfaction to the readers.
Another reason is that it gives a chance to explore different 'what - if' scenarios. What if a character had made a different choice 19 years ago? How would that have changed the present? Fanfiction writers can play around with these ideas, which is really appealing to fans. Also, seeing the growth and development of the original characters' children or the further development of the wizarding world is exciting for fans who have a deep connection to the 'Harry Potter' universe.
The popularity also lies in the fact that it allows fans to expand on the 'Harry Potter' universe. By focusing on the relationship between Harry and Dudley, fanfiction writers can create unique stories that might include elements that were only hinted at in the original series. For example, exploring how Dudley's upbringing in a Muggle family affected his view of Harry's magic, and how that view could be altered in different scenarios.