Obviously, Harry Potter is one of the main characters. He is the one who has the power to control the Dursleys. And of course, the Dursleys - Vernon, Petunia and Dudley - are also main characters as they are the ones being controlled by Harry.
The main characters are Harry, who is the protagonist with the ability to control. Then there are the Dursleys. Vernon Dursley, the grumpy and overbearing uncle, Petunia Dursley, the envious aunt, and Dudley Dursley, the spoiled cousin. Their interactions with Harry, especially with Harry in a controlling position, form the core of the fanfiction.
Well, Harry Potter himself is surely one of the main characters as the title implies he has the power to control time. Hermione Granger is likely to be another main character. She is always by Harry's side in the original series and would be there to help him understand and manage his new time - controlling ability, perhaps with her vast knowledge and logical thinking.
Obviously, Harry would be one of the main characters. There might also be his friends like Hermione and Ron, who could either support or be skeptical of his new power.
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.
Well, in some fanfictions, Harry might control the Dursleys by making them understand the wizarding world. He could show them magical things and, as a result, they start to respect him and his abilities. This could lead to a whole new dynamic in the household, where the Dursleys are no longer mean but rather in awe of Harry and his magic.
Obviously, Harry Potter is the main character as the title implies. He's the one with the power to control the elements. Hermione Granger and Ron Weasley would also likely be important characters. Hermione could be helping Harry research about the origin of his element - controlling ability, and Ron would be by his side in his adventures, providing support and some comic relief.
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. He is the one with the motivation to fight against the Dursleys due to their years of mistreatment.
The main characters would start with Harry Potter. Then, there could be some members of the pure - blood families. For instance, Draco Malfoy could be a key character. His family's obsession with blood purity and his own complex relationship with Harry could be further explored in the context of Harry's control over blood magic. Also, characters like Neville Longbottom could be involved, perhaps his connection to his family's history through blood could be related to Harry's new power.
The main character is Harry Potter. However, other characters like Luna Lovegood could be important. Her unique perspective on the wizarding world might offer Harry new insights on how to use his reality - controlling powers. And Neville Longbottom could also be involved, perhaps using his new - found confidence to support Harry in his reality - altering adventures.
Ron would be there too. He could be in charge of things like the Gryffindor common room or helping Harry with student relations. And of course, Dumbledore might still have some influence in the background, even if Harry is in control. His wisdom could be a guiding force for Harry as he navigates running the school.