Maybe Dudley's child shows some early signs of magic, which scares Dudley as he has no idea how to handle it. Harry, remembering his own difficult childhood with the Dursleys, decides to adopt the child. In the fanfic, there could be a lot of scenes where Harry has to deal with the child's questions about his or her new life. For example, the child might be confused about why they can do strange things like making objects float while their friends in the Muggle world can't. Harry would then patiently explain about magic and Hogwarts.
In this fanfic, it could be that Dudley realizes he's not cut out to be a good father due to his own upbringing and past mistakes. Harry, on the other hand, has a strong sense of family despite his own rough start. So he adopts the child. The story might focus on how Harry uses his experiences at Hogwarts and with his friends to raise the child. There could be adventures where they visit the Weasley family together, and the child learns about the different kinds of magic and magical creatures through these experiences.
Well, one possible plot could be that Dudley gets into some kind of trouble or situation where he can't take care of his child. Harry, having grown into a kind and responsible person, steps in. He might introduce the child to the wizarding world in a gentle way, teaching the kid about magic and also about the importance of family values. The story could also involve the child struggling to fit in both the Muggle and wizarding worlds, with Harry as their guide.
Well, Harry and Dudley's relationship would change drastically. Harry, by adopting Dudley's child, is taking on a huge responsibility. Dudley might initially be in denial about the whole situation, but as time passes, he realizes that Harry is providing a better life for his offspring. This could lead to a thaw in their long - standing animosity. Harry might start to view Dudley as someone who has made mistakes but is also trying to do right by his child in his own way. And Dudley could start to view Harry as a real family member, someone he can rely on.
The plot might involve Naruto seeing a child who is being bullied or left out in Konoha. He decides to adopt the child and raise it as his own. As the child grows, they face challenges together, like dealing with the child's insecurities. Naruto uses his own experiences of being an outcast as a child to help the kid feel accepted and confident.
In such a fanfiction, perhaps the plot could involve Harry seeing a child in a difficult situation, like an orphan in the wizarding world who has no family due to a dark wizard's attack. Harry, having been an orphan himself, feels a strong connection and decides to adopt the child. He then teaches the child about magic, love, and how to face the challenges in the wizarding world.
The child could be an orphan from a small, destroyed village that Naruto comes across during one of his missions. This child might have lost their family to a powerful enemy and Naruto feels a sense of responsibility to take them in.
One possible plot could be that Harry discovers a young Tom in a difficult situation, perhaps an orphanage similar to his own past. He decides to take Tom under his wing out of a sense of empathy. Harry then tries to guide Tom away from the dark path he originally took in the canon. For example, he might introduce Tom to the world of positive magic and friendship early on, which could change Tom's perspective on life and magic.
In a 'Grindelwald Adopts Harry' fanfic, Grindelwald could be seeking to create an heir of sorts. He adopts Harry when he is very young. Grindelwald might expose Harry to a world of magic that is different from what he would have known at Hogwarts. Harry could be taught magic that is more about power and control. However, as Harry gets older, he might discover the truth about Grindelwald's dark deeds and his plans for the wizarding world. This could lead to a great internal struggle within Harry as he has to choose between the man who raised him and what he believes is right for the wizarding community as a whole. There could be a lot of drama as Harry tries to find his place and figure out his true identity in this new and rather dark scenario.
Well, one possibility could be that Voldemort adopts Harry as a way to control the wizarding world. He might think that by having Harry on his side, the resistance against him will crumble. Another could be that Voldemort discovers some sort of connection between him and Harry that makes him want to take Harry under his wing, perhaps related to some long - forgotten prophecy.
In some fanfics, they might become reluctant allies. As adults, they could have grown out of their childhood enmity. Maybe Dudley has seen the real threats in the wizarding world through Harry's experiences and realizes they need to work together for the greater good.
A plot might be about Harry's child struggling with the pressure of living up to their father's legacy. At Hogwarts, they constantly feel compared to Harry. But then, they find their own niche in the wizarding world by being really good at potion - making. They enter a big potion - making competition and end up using their skills to save the day when a dark potion goes wrong and starts affecting students. They prove that they can be great in their own way, not just because they are Harry Potter's child.
One possible plot could be that Aunt Marge, surprisingly, has a change of heart. She starts to see Harry's potential and decides to take him in. She might try to 'muggle - ize' Harry, making him fit into her more ordinary world. This could lead to many comical situations as Harry tries to adapt to her rules while still having his wizarding side peek through now and then.