Sure. There's a fanfiction where Dudley has a change of heart and decides to protect Harry from some dark wizards who are after him. It shows a new side of Dudley, one that is brave and willing to stand up for what's right.
Another one is about Dudley getting sorted into Hogwarts (in an alternate universe of course). It's really interesting to see how he copes with the magical education and the different houses. He has to learn to fit in and deal with his own prejudices against the wizarding world that were instilled in him by his parents.
There's also a fanfiction that focuses on Dudley's relationship with his parents after he starts to understand the truth about Harry. He tries to break free from their controlling ways and become his own person. It delves deep into his character development and how he overcomes the negative influence of his family.
One popular 'Harry Potter and Dudley Dursley fanfic' is 'Dudley's New Beginning'. It explores Dudley's character development after the events of the original series. Another great one could be 'Dudley and Harry: A Different Bond' which focuses on their relationship in a more in - depth way.
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.
One great Dudley Dursley fanfiction is 'A Different Dudley' which shows Dudley growing and changing in unexpected ways. It really delves into his character and gives him more depth than in the original series.
One popular 'Harry Potter Dudley Dursley slash fanfiction' might be those that explore their complex relationship in a more positive light. For example, some stories could focus on how they grow to understand each other despite their initial animosity. However, it can be quite hard to recommend specific ones as it depends on personal taste in terms of writing style and plot development.
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.
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 'Harry Potter x Dudley Dursley fanfiction' could be those that explore their relationship transformation. Maybe a story where Dudley finally realizes the unfairness he's shown to Harry over the years and tries to make amends. This could involve them teaming up against some dark magic threat in their neighborhood that affects both of them.
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.
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.
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.