Obviously, Harry Potter himself is the central character. Then there are often female characters from the original series. Hermione Granger could be one of them. In the harem scenario, her relationship with an evil Harry would be a major focus, as she might be conflicted between her old friendship and his new evil ways.
There could also be some of the Slytherin girls. For example, Pansy Parkinson. Since Harry is evil in this fanfiction, his relationships with the more traditionally 'dark - side' characters from Slytherin could be developed, and she might be attracted to his new - found power and evil charm, thus becoming part of his harem.
Draco Malfoy is often a central character. His complex personality and his Slytherin pride make him a natural fit in these types of fanfictions. He can be both a love interest and a source of conflict.
Harry Potter is often the central character in such fanfictions. Hermione Granger and Ginny Weasley are very common as part of his potential harem. Sometimes, Luna Lovegood also makes an appearance in the harem. Draco Malfoy might be included as well, in some cases where the fanfiction takes a more unique approach to relationships.
Draco Malfoy could be a character in these fanfictions. His family's dark magic associations might play a part in the Imperio harem scenario. He could be either a rival or an ally in the complex relationships. Ginny Weasley might also be present, adding her own brand of courage and magic to the mix.
Well, Fleur Delacour could be part of the harem. She's a beautiful and powerful witch from Beauxbatons. In some fanfictions, she's attracted to Harry's strength and charm. Cho Chang might also be included. Even though her relationship with Harry in the original was a bit rocky, in harem fics she can have a second chance. And then there's Daphne Greengrass. She's a Slytherin and can bring a different kind of Slytherin - like cunning and allure to Harry's harem.
Harry Potter himself is often a common character. He might be the one who accidentally stumbles upon the hypnosis magic and ends up with a harem. Hermione Granger is also frequently included. Her intelligence could be used in different ways in the story, like helping to understand the hypnosis magic better or being an important part of the harem dynamic. Ginny Weasley is another character that can be part of the harem. She has her own strong - willed personality that can add interesting twists to the story.
Oliver Wood is another character that might be in such fanfiction. He's extremely passionate about Quidditch. In a harem - related Quidditch fanfiction, he could be the object of affection for some students who are attracted to his dedication and skill on the pitch. Also, the Weasley twins, Fred and George, could be involved. Their mischievous nature combined with their Quidditch skills might draw a group of followers or love interests.
Aside from the main female characters like Hermione, Ginny, and Luna, some fanfictions might include Fleur Delacour. She's beautiful and has her own charm. And then there could be some original characters created just for the fanfiction. These original characters could be from different magical families around the world, bringing in new cultures and types of magic to the story.
Ron Weasley could be there too. He might be a bit more clueless at first about the hypno harem situation but would still be dragged into it. And of course, there could be some original characters created just for these fanfictions. They could be new students or mysterious wizards who are either causing the hypno or are part of the harem that forms.
Hermione Granger is often included. She can bring her intelligence and magical knowledge to the harem, and her relationship with Harry can take on a new dimension in this context. Also, Ginny Weasley might be there, as she already has a romantic connection with Harry in the original series.
Another common 'evil female' in Harry Potter fanfic could be a made - up character. For instance, a new transfer student from a foreign wizarding school who turns out to be an agent of a dark wizarding organization. She would use her beauty and charm to deceive the Hogwarts students and faculty while she works towards her evil goals, like stealing important magical artifacts from the school.