Survival is also a theme. In some fanfictions, they have to team up to survive a new threat. This forces them to put aside their differences and rely on each other. It's an interesting take on their relationship as they are so different in the original books.
Another theme is family. Since they are related, albeit reluctantly in the original story, fanfictions often explore what it means to be family. They might show how Harry and Vernon could form a strange but real family bond.
In many 'Harry Potter x Vernon Dursley fanfic', the theme of growth is prevalent. Both characters can grow and learn from each other. For example, Harry might teach Vernon about the importance of acceptance, while Vernon could show Harry some aspects of the Muggle world he hadn't considered. Also, the theme of power struggle can be seen. Vernon has a certain kind of power over Harry in the Dursley household, and fanfics might explore how that power shifts as Harry grows older and more powerful in the wizarding world. And of course, there's the theme of forgiveness. Given how horribly Vernon has treated Harry in the books, some fanfics will focus on whether Harry can forgive him or not.
One common theme could be the exploration of a relationship that is completely different from what we see in the original series. It might involve the two characters overcoming their initial animosity.
Well, in 'Harry Potter Vernon Dursley slash fanfiction', a frequent theme is the transformation of Vernon Dursley's personality. Maybe he becomes more sympathetic or his rough edges are softened. There could also be themes related to the magical world's impact on him in a new way, different from how it was shown in the original series. For example, his interactions with magic could lead to personal growth or new relationships that were not possible before. This can create a lot of interesting plot twists and character developments within the fanfiction.
Redemption is also a popular theme. Writers often like to give Vernon a chance to make up for his years of mistreating Harry. They might show him gradually changing his views and actions towards Harry as he realizes the error of his ways. Another theme is the clash between the Muggle and magical cultures through Vernon's eyes. His strict adherence to Muggle normalcy makes for an interesting contrast when faced with the chaos of the magical world.
One common theme is redemption. Dudley has been a bully to Harry for a long time, so many fanfictions explore him seeking redemption for his past actions. Another theme is family. Despite their difficult relationship, they are family, and fanfictions often play with this idea, showing how they can come to terms with each other.
One common theme is redemption. Fanfictions often explore Petunia's chance to redeem herself in Harry's eyes after years of treating him poorly. For example, she might suddenly realize the importance of family and try to make amends.
One main theme could be redemption. Since Vernon was so mean to Harry, a fanfiction might explore how he redeems himself through love. Another theme could be the power of love to change relationships. It could show how their relationship evolves from hostility to love.
There's also a fanfic called 'Unexpected Bonds'. In this story, a series of magical accidents force Harry and Vernon to work together. It's really fascinating as it delves into their personalities and how they interact when they have no choice but to cooperate. This fanfic has some great character development for both of them.
One interesting fanfiction could be about Vernon Dursley having to face a magical threat in the Muggle world on his own. He might have to rely on some of the little knowledge he has about the wizarding world through Harry. Another could be a story where Vernon and Harry are forced to work together during a crisis that affects both the Muggle and wizarding communities, changing their relationship completely. There could also be a fanfiction exploring Vernon's past and how it might have influenced his treatment of Harry, and then how things could have been different if certain events in his past were changed.
One interesting fanfiction could be about Vernon Dursley's perspective during the time when Harry first received his Hogwarts letter. It might explore his extreme reactions and the inner turmoil he felt at the thought of magic being real. Another could focus on a situation where Vernon has to interact with the wizarding world in an unexpected way, like when he accidentally stumbles into Diagon Alley.