Well, it could be that the Dursleys are still as cold as ever at first. But Harry, having grown so much during the war, doesn't let their attitude affect him. Instead, he just calmly states his new life and how he has moved on from their influence. Maybe this makes the Dursleys start to see him in a new light and gradually change their view of him.
One possibility is that the Dursleys are terrified when they see Harry after the war. They know he is a powerful wizard now and they are afraid of any retaliation for their past mistreatment. However, Harry has no intention of harming them. He might use this opportunity to educate them about the wizarding world a bit more, trying to bridge the gap between their two worlds and show them that he doesn't hold grudges, which could lead to a very different kind of relationship between them.
One possibility is that there could be a very tense encounter. The Dursleys have always been unkind to Harry, and after the war, they might be even more resentful or fearful. They could try to avoid him or act coldly.
In some fanfictions, they might have an emotional reunion. Harry could finally let go of all the war - related traumas and just focus on his love for Ginny. They may embrace tightly and share a long - awaited kiss, realizing how much they've missed each other during the war.
Perhaps Snape would initially mistake the Dursleys for some sort of Muggles with a bit of dark magic in them due to their cruel nature. He could start investigating them, which would cause chaos in the Dursley household as they try to hide their secrets from a wizard like Snape.
In the 'Daphne meets the Dursleys fanfiction', it's possible that Daphne initially has a hard time understanding the Muggle - like ways of the Dursleys. However, as time passes, she might start to see through their facade. She could then form a plan to get Harry out of that unpleasant environment. For example, she could pretend to be a social worker or something similar in the Muggle world and convince the Dursleys to let Harry go with her. And then she could introduce Harry to the wizarding world in a more positive and gentle way than how the Dursleys have been treating him.
Well, Sirius might be shocked by the Dursleys' treatment of Harry. He could try to rescue Harry from their mean ways.
One possibility is that Remus meets the Dursleys when he is on some sort of mission related to Harry. He could be there to assess the safety of Harry's living situation. He might find the Dursleys' treatment of Harry unacceptable and try to subtly change things. He could offer to help around the house in a very civilized way, making the Dursleys a bit confused as they are not used to such kindness from the wizarding world. This could lead to a series of events where the Dursleys start to question their own views about wizards and witches.
One possibility is that Draco, being from a pure - blood wizarding family, could try to 'educate' the Dursleys on the wizarding world. He might brag about his family's wealth and status, which could lead to some comical situations. The Dursleys, on the other hand, might be completely unimpressed and tell Draco off, which would be a new experience for him as he's used to being fawned over in the wizarding world.
Well, perhaps Teddy would be shocked by the Dursleys' coldness. Teddy, being a more open - minded wizard, might not understand their narrow - mindedness at first.
In such a fanfiction, Hermione's encounter with the Dursleys could be full of drama. Since Hermione is a clever witch, she may use her magic knowledge to expose the Dursleys' ill - treatment of Harry. For example, she could magically make Dudley see how wrong his parents' actions are. At the same time, she may also try to bridge the gap between the wizarding world and the Dursleys, though it would be a difficult task considering the Dursleys' deep - rooted dislike for anything magical. However, Hermione's determination might bring some unexpected changes to the Dursleys' household.
In fanfiction, when James Sirius Potter meets the Dursleys, he might be shocked by their coldness. He could try to understand why they treated Harry so badly. Maybe he'd confront them about their past actions, or he might just observe them quietly to see what kind of people they really are.