One idea could be that Ginny and Dudley accidentally meet in a magical mishap. Maybe a spell gone wrong transports Dudley into the wizarding world near Ginny. They initially dislike each other due to their different backgrounds, but as they are forced to work together to get Dudley back home, they start to see each other's good sides.
A plot could involve Ginny using her magic to help Dudley with a personal problem in the Muggle world. Dudley has always been a bit of an outcast in his own way, and Ginny's unique perspective and abilities could offer him a new way to deal with his issues. This could lead to a growing friendship and then perhaps something more.
In the fanfiction, Ginny could be developed by exploring her magical abilities further in relation to Dudley. For example, she could use her magic to show Dudley the beauty of the wizarding world, which in turn makes her more confident in her own identity. Dudley's character can be developed by having him face his own insecurities. He realizes that Ginny is different from what he thought wizards were like, and this makes him question his own upbringing and beliefs.
One interesting plot idea could be Dudley traveling back in time to when his parents first got married. He could see how his family's attitudes towards magic and the Potters were formed. Another could be him traveling forward in time to see the impact of Harry Potter's actions on the wizarding world and how it indirectly affects the Muggle world he lives in. Maybe he travels to a time when a major wizard - Muggle conflict was about to start and he has to use his new - found knowledge of both worlds to prevent it.
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.
Maybe they are running in a magical race. Harry uses his broom - flying skills in parts where he can, but Dudley, being more used to running on the ground, finds shortcuts through Muggle - like alleys that are magically connected. Along the way, they meet various magical creatures that either help or hinder them, and they have to figure out how to deal with them as a team.
One plot idea could be that Dudley somehow gets involved in the wizarding world due to a magical accident. Snape, initially reluctant, has to keep an eye on him. Meanwhile, Harry is caught in the middle, trying to balance his relationship with Dudley and dealing with Snape's grumpiness. For example, Dudley could accidentally drink a potion meant for someone else and start showing magical abilities, leading to chaos and an unlikely alliance between him and Snape to reverse the effects.
One plot idea could be that Hermione and Ginny team up to play a prank on Harry, but it backfires in a hilarious way. For example, they try to make his hair turn purple but instead it starts changing colors every few seconds. Another idea is that the three of them go on a secret adventure outside of Hogwarts to find a lost magical artifact. They face various challenges and their friendship is tested. And perhaps a plot where Hermione discovers a new spell that accidentally causes some chaos between Ginny and Harry's relationship, and she has to find a way to fix it.
One idea could be exploring their wedding planning and all the chaos that comes with it. Maybe Molly Weasley is over - involved and wants everything to be perfect, while Ginny just wants a simple ceremony. Another could be their first year of marriage, dealing with things like living together in a new home and adjusting to each other's habits.
In a 'Harry Marries Ginny' fanfiction, a great plot could be about them starting a family. It could detail Ginny's pregnancy, Harry's concerns and excitement, and how they prepare for the arrival of their baby. It could also include the reactions of their friends and family. This would be a heart - warming story that shows their growth as individuals and as a couple.
One idea could be that Snape discovers Ginny is pregnant and he's initially in shock as it goes against all the norms of their relationship. He then decides to be there for her despite the potential scandal. Another could be Ginny trying to hide the pregnancy from the wizarding world for fear of how they'll react, especially given Snape's past and her own family's reputation.
Well, they might be shopping for Quidditch gear. Ginny, being a Quidditch enthusiast, could be dragging Hermione along to find the latest broom accessories or team uniforms. Along the way, they get into a bit of trouble when they accidentally stumble upon a shop that sells dark or restricted items. They have to figure out how to get out of there without getting in trouble with the Ministry. And perhaps they end up finding a really cool, legal Quidditch item that helps Ginny's team win their next match.