There might also be some minor characters from the wizarding world that make an appearance. For instance, Dobby the house - elf could show up. Dobby has a history of trying to protect Harry, and in this fanfiction, he could come to the Dursleys' house to help Harry in his fight. Maybe he uses his magic to make the Dursleys' house a bit of a chaotic mess, which would be a way to annoy and fight against them on Harry's behalf.
The Dursleys - Vernon, Petunia, and Dudley - are also main characters in this kind of fanfiction. They are the antagonists that Harry is fighting against. Their mean - spirited and often cruel behavior towards Harry sets the stage for the conflict. Additionally, there could be other characters like Hedwig. Harry's owl. She could play a role, for example, by delivering messages to his friends at Hogwarts asking for help in his fight against the Dursleys.
Obviously, Harry Potter himself is the main character. He is the one with the motivation to fight against the Dursleys due to their years of mistreatment.
Obviously, Harry Potter is one of the main characters. He is the one who is being accepted by the Dursleys. Then there are the Dursleys themselves - Vernon, Petunia, and Dudley. Vernon is the strict and often grumpy uncle, Petunia is the aunt who has always been envious of Lily (Harry's mother), and Dudley is the spoiled cousin. Their interactions with Harry will be central to the story as they shift from their previous negative attitude towards acceptance.
Obviously, Harry Potter himself is the main character as he is the one getting back at the Dursleys. The Dursleys - Uncle Vernon, Aunt Petunia, and Dudley - are also main characters as they are the targets of Harry's revenge.
The main characters would be Harry Potter without a doubt. Since he is the focal point of the story as he is chained up. The Dursleys are key characters too. Vernon Dursley, with his mean - spirited nature, Petunia, who has always been cold towards Harry, and Dudley, who might have a change of heart during the story. And of course, we can't forget about Hedwig. She could be a crucial character, perhaps trying to bring help to Harry or at least provide some comfort while he is in such a dire situation.
Hermione would likely be one of the characters. She's Harry's best friend and would probably try to find him and help him out. Ron might also be there, as he's always been by Harry's side. Dumbledore could be another character. He might be trying to keep an eye on Harry from afar, or perhaps he has a plan for Harry's new situation. Hagrid would also be a likely character. He has a soft spot for Harry and would want to make sure he's okay. And of course, the Dursleys themselves might make appearances, either to continue their mean - spirited ways or to have a change of heart.
His friends from Hogwarts like Ron and Hermione. They are always by his side and would probably be more than happy to help Harry get revenge on the Dursleys. They might use their magic skills together to create some really interesting revenge scenarios.
Obviously, Harry Potter himself. He's the main character who is going to fight back.
Obviously, Harry's kids would be the main characters. They could be the ones driving the story forward with their curiosity about their father's past and the Dursleys. And of course, the Dursleys themselves. Vernon, Petunia, and Dudley. They are important as they are the connection to Harry's difficult childhood. Their reactions to the kids would be a major part of the story.
Ron would also be there for Harry. His loyalty and friendship mean he'd be by Harry's side, maybe even using his own family's magic - related knowledge to assist. And of course, Dumbledore. He has a vast amount of magical knowledge and wisdom, and he'd probably offer some crucial advice or perform a spell to help Harry.
Draco would surely interact with the Dursleys. Vernon would probably be very suspicious and hostile towards Draco at first, seeing him as another strange and magical being. Petunia might be a bit more reserved but also curious in her own way. Dudley could range from being intimidated by Draco's wizarding background to being fascinated. And don't forget about Hedwig! If she's still around, Draco might have some sort of interaction with the owl, which could be really funny or interesting as he tries to figure out how to deal with this magical creature in the Muggle - dominated Dursleys' household.
Obviously, Harry Potter is a main character as the story is centered around him as a baby at the Dursleys. Then there are the Dursleys themselves - Vernon, Petunia, and Dudley. Vernon is the strict and often cruel uncle, Petunia is the conflicted aunt who has her own issues related to the wizarding world, and Dudley is the spoiled cousin.