What are some interesting ideas in 'Dursley turn Harry to the dark fanfiction'?

They could also physically and emotionally isolate him even more than they do in the original story. By cutting him off from any positive influence, like his friends at Hogwarts, they make him more vulnerable. Then, they could introduce him to some seemingly 'cool' or 'powerful' dark magic artifacts or spells, which might initially attract Harry's curiosity and eventually lead him down a darker path. For instance, they might find a way to get their hands on a dark magic book and leave it for Harry to discover.

A great plot could be centered around Dudley and Harry being forced to work together on a project in the Muggle world that has some unexpected magical implications. This could lead to them understanding each other better and forging a new kind of relationship. For example, they might be involved in an archaeological dig that uncovers a lost magical artifact, and they have to keep it safe from both Muggle and wizarding thieves.

One idea could be that as Harry turns into a girl, he has to navigate the different social dynamics in Hogwarts. For example, he might be treated differently by his male friends like Ron and Hermione. Maybe Ron is initially awkward around 'her' but then realizes that it's still Harry inside. Hermione could be more empathetic and help Harry adjust to the physical and social changes.

One interesting 'Harry Potter Dursley fanfiction' could be about Dudley Dursley having a change of heart after the war. He realizes how cruel he and his family were to Harry and tries to make amends. Maybe he starts to study magic in secret, trying to understand the world he once shunned.

Another plot could be a time - travel scenario. A character goes back in time and changes the way the Dursleys treated Harry. As a result, they become a more loving and accepting family. This alteration in their relationship could have a huge impact on the entire wizarding world as Harry grows up with a more positive influence.

Another plot could be that the Dursley family gets involved in a magical adventure that has nothing to do with Harry. For example, they accidentally stumble upon a magical artifact that transports them to a different magical realm where they have to learn magic quickly to survive and find their way back home.

A possible plot could be a time - travel scenario where Harry and Petunia are sent back in time. They have to rely on each other to survive in the past, and in the process, they learn more about their family history and each other. This shared adventure could lead to a deeper understanding and a different kind of relationship between them.

There might be a fanfiction where Dudley gets involved in a magical adventure accidentally. For example, he stumbles upon a magical object that was meant for Harry but now has drawn him into a dangerous yet exciting situation in the wizarding world. He has to learn to rely on his own courage and the help of some unlikely allies.

One idea could be exploring the backstory of a Dementor. Maybe it was once a wizard who dabbled in dark magic too much and was cursed to become that form. Another could be a story about a werewolf who tries to find a cure in the wizarding world outside of the Wolfsbane Potion. And also, a fanfiction about a Basilisk that has a secret connection to an ancient wizarding family.

Another interesting fanfiction idea would be to have a character from The Dark Crystal, like Jen, end up at Hogwarts. Jen could learn about magic and how it differs from the magic in his own world. He might form friendships with the Hogwarts students and together they could face a common threat that somehow links the two universes, like a dark force that wants to take over both the wizarding world and the world of The Dark Crystal.