One great Dudley Dursley story is when he finally realizes how mean he has been to Harry Potter. It shows his growth as a character. For example, in the later parts of the series, Dudley starts to see Harry in a different light and even shows a bit of kindness, which is a big change from his bullying ways at the start.
In the story where Dudley is on a diet and the magic pudding appears, it's a really good Dudley Dursley story. He is so focused on his diet but then this magical pudding comes along and completely throws him off. It shows his struggle with self - control and also how the magic in Harry's world can disrupt the normal order of things in the Dursley household. This also reveals more about Dudley's character, especially his relationship with food and his desire to fit in with his family's idea of a proper lifestyle.
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.
Since 'lemon' fanfiction is not something I can recommend due to its nature, you could start by exploring fanfiction tags related to Dudley Dursley such as 'character study' or 'alternate universe'. This way, you can find fanfictions that focus on different aspects of his character and his relationships in a more appropriate and positive way.
One interesting fanfiction could be about Dudley having a change of heart and secretly helping Harry in the wizarding world. Maybe he discovers some magic ability of his own, which is a total twist from the original story.
One common theme is redemption. Many fanfics focus on Dudley realizing his past mistakes and trying to become a better person. Another theme is the exploration of his relationship with Harry. Since they had a rocky start, fanfics often explore how they can reconcile or at least understand each other better.
In 'Harry Potter and Dudley Dursley' lemon fanfiction, often the character development is a key aspect. Writers might take Dudley, who was a bully in the original series, and transform him into a more sympathetic character. They might show how his experiences with Harry over time, especially in these fan - created scenarios, lead to his growth. And for Harry, it could be about seeing a different side of Dudley that he never expected, which could be quite fascinating to read about.
There's a fanfic titled 'Dudley Dursley: A Different Path'. In this story, Dudley gets involved in some minor magical adventures that change his perception of magic and wizards completely. He begins to embrace the idea of magic rather than fearing or resenting it like he did in the original books. It's really interesting to see his character develop in this new context.
His relationship with Harry Potter can be a great area to explore. In fanfiction, writers can delve deeper into how they might interact outside of the main story's events. Maybe they start to understand each other better and form an unexpected friendship or a more positive family - like bond.
The most obvious deviation is the relationship between them. In the original story, they are mostly at odds. But in lemon fanfiction, they might have a much closer, even romantic or sexually - charged relationship, which is completely different from the canon. Also, their character traits can be altered. Dudley may be less of a brute and more understanding, while Harry might be more open to Dudley in ways that the original story doesn't suggest.