The reunion could be the start of a healing process in their relationship. For so long, there was animosity between them. But when they meet again, they could see the pain they've both been through. Harry has faced many challenges in the wizarding world, and Dudley has had his own struggles in the Muggle world. This realization could make them more empathetic towards each other. They could start to communicate more openly and build a new, more positive relationship based on mutual understanding.
It could completely transform their relationship. If they have a positive reunion, they might become friends. They could start to support each other in different ways. Harry could use his magic skills to help Dudley out in small ways, like fixing something around his house without Dudley knowing it was magic. Dudley, in return, could offer Harry some insights into the Muggle world that Harry might not be fully aware of.
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.
Harry might become more open and less guarded. Since he now has a brother in Dudley, he might feel more at home in the Muggle world. Dudley, on the other hand, could become less of a bully. The knowledge that he has a wizard for a brother could make him more humble and empathetic.
Well, it changes their relationship in that they become closer. Dudley's overprotective nature means he starts to see Harry as someone precious to him. This could lead to them sharing secrets. Harry might tell Dudley more about the wizarding world, and Dudley could confide in Harry about his insecurities. They might even team up against common enemies, like those who look down on both of them for different reasons. Overall, it makes their relationship more complex and interesting.
Harry could become more confident and self - assured as an adult. He has been through so much in his youth that he would have a strong sense of self. Dudley might become less of a bully. Maybe he has a family of his own and has learned to be more kind and patient, influenced by his own family life.
Harry could become more relaxed. After all the battles and traumas of his youth, as an adult he might be more at peace. He could be less impulsive and more calculating. Dudley, having matured, might lose his bullying nature completely. He could be more empathetic, especially after experiencing some hardships in his own life that made him realize how his actions affected others.
Their relationship could become closer. They might start seeing each other in a new light. Maybe Fred will see Hermione not just as the book - smart girl from school, but as a really interesting and complex person. And Hermione could see Fred as more than just a prankster.
Well, they might meet in a rather unexpected place. For example, Dudley could be on a business trip and end up in a town near where Harry lives. At first, they might not recognize each other. But when they do, there could be a flood of memories. They could end up having a meal together and during the meal, they start to really understand each other for the first time. Dudley could apologize for his past behavior, and Harry could accept it graciously.
Well, if Harry and Dudley became friends, it would drastically change the whole dynamic of the early Harry Potter story. For one, Harry might not have felt so alone at the Dursleys' place. Dudley could have protected Harry from Vernon's wrath. Also, they could have shared secrets about the wizarding world with Dudley being a Muggle. This new friendship might even have led to Dudley developing an understanding and acceptance of the magical world much earlier, and perhaps he could have been an ally to Harry in the fight against Voldemort, instead of a bully.
Dudley could start to view Harry in a more empathetic way. Fanfiction might show Harry dealing with emotional struggles that Dudley can relate to, like feeling lonely or misunderstood. Through these stories, Dudley might see that Harry is not so different from himself in some ways, which could change his view from one of annoyance or envy to one of understanding.
Harry's relationship with the Weasley family could grow even deeper. Teddy would be welcomed into the large Weasley clan. Molly Weasley would probably dote on Teddy, cooking his favorite meals. Harry's bond with Neville could also strengthen as they might share their experiences of taking care of the younger generation. And his relationship with the wizarding community as a whole would be seen in a new light, as he is now a father figure.