The main characters would surely include Harry himself. Dumbledore, even if dead in the original story, could still have an influence in the fanfiction. His teachings or the way he had influenced Harry before could be a factor in Harry's transformation into a dictator. And then there are the Death Eaters or their remnants. They might try to take advantage of Harry's new - found dictatorship, or they could be the ones Harry is trying to oppress more harshly.
Obviously, Harry would be the main character as the title implies. But other characters like Hermione and Ron would also be important. They could either be part of Harry's regime, reluctantly or wholeheartedly, or they could be part of the resistance against his dictatorship.
Perhaps there is a female alien diplomat who tries to negotiate with Harry to stop his tyrannical rule. Also, there could be a group of human astronauts who end up in his space domain and have to either submit to his rule or try to escape. Another character could be an old space wizard who has knowledge of a power that could dethrone Harry and is hunted by his forces.
Obviously, Harry would be the main character. Since it's about him being a playboy, he would be at the center of the story. There might also be his friends like Ron and Hermione. They could play important roles in either supporting or trying to change Harry's playboy ways.
Obviously, Harry would be the main character. Since it's about him being a Saiyan. And I think some of his friends from the Harry Potter series might also be important characters, like Hermione and Ron. They could react to Harry's new Saiyan identity in different ways.
Obviously, Harry as the reborn Black would be a main character. Sirius Black would probably also play a major role, as he's an important part of the Black family. And Bellatrix Lestrange could be another key character, her relationship with the Black family and her own dark nature would create a lot of interesting interactions with Harry in his new identity.
Harry Potter is central as the possessed. Voldemort is crucial as the possessor. Harry's friends are bound to be main characters. Hermione, with her intelligence, would be constantly observing Harry's strange behavior and coming up with theories. Ron, being Harry's loyal friend, would be by his side and ready to fight for him. Also, characters like Sirius Black, if he's still alive in the fanfiction's timeline, could be involved. He has a close connection to Harry and would surely want to help him get rid of Voldemort's control.
There could be other supporting characters too. Maybe some of Harry's friends from Hogwarts like Hermione and Ron could make an appearance in the fanfiction. They might be initially skeptical of Carskile but then grow to accept him. And on Carskile's side, he could have his own set of friends or family members who play a role in the story, for example, his sister who gives him advice on how to deal with Harry.
In this kind of fanfiction, Neville Longbottom could also emerge as a key character. He has shown great courage and growth throughout the Harry Potter series. When Hera enters the picture, Neville could be the one who has an unexpected connection with her. Maybe his family's long - forgotten magical heritage has some link to the Greek mythology that Hera represents. And then there are the Death Eaters. If the story is set during the darker times in the wizarding world, the Death Eaters might see Hera as a new threat or a potential ally, making them important characters in the fanfiction as well.
Obviously, Harry Potter is one of the main characters. Since it's about his betrothal, he'll be central to the story. The Lestrange he's betrothed to will also be a major character, whether it's an existing character like Bellatrix's younger relative or an original character created for the fanfiction.
Harry for sure. Then there could be his samurai mentors. Maybe there would also be some characters from the original Harry Potter world who interact with him in this new samurai - influenced life. For example, Hermione might visit him in the samurai village and be amazed at the new skills he has learned.
There could also be some minor characters that become more important in this fanfiction. For example, Harry's parents, James and Lily. Since Harry is changing the past, they might have more of a role to play. Or perhaps characters like Sirius Black or Remus Lupin could be involved in different ways due to the changes Harry makes in the past.