Obviously, Harry Potter himself is a central character. Hermione Granger often appears as she has a strong connection to Harry in the original series. Ginny Weasley might also be part of the harem as she was Harry's love interest in the books. Additionally, some original characters created for the fanfiction might be included to add more variety to the harem.
Potential characters could range from the well - known witches at Hogwarts to those from other magical institutions. Fleur Delacour could be in the harem, given her beauty and magical abilities. And there could be characters from the wizarding world outside of Britain too. Maybe a Japanese wizard or witch who has unique magical techniques and is drawn to the Harem Lord's power and charisma.
One common trope is the 'fish out of water' situation for Harry. In a harem fanfic, he might be suddenly surrounded by a group of characters who are romantically interested in him, and he has to navigate these new relationships while still dealing with his wizarding world duties, like fighting Voldemort. Another trope could be the 'power couple' or 'power harem' where Harry and his harem members combine their powers to overcome great threats. For example, Hermione's intelligence combined with Harry's magical abilities and the unique skills of other harem members like Ginny's Quidditch skills or Luna's intuitive magic.
Well, aside from the ones mentioned before, Cho Chang could be in a Harry Potter harem in fanfiction. She was Harry's first crush in the original books. Then there's Daphne Greengrass. In some fanfictions, she is portrayed as having a growing attraction to Harry. And of course, there's Pansy Parkinson. Although she was often an antagonist in the original series, in harem fanfiction, she could have a change of heart and become interested in Harry. Also, Tonks could be a potential member. Her shape - shifting abilities and her spunky personality would make her an interesting addition to the harem.
One possible plot could be that Harry discovers he has a connection to Lord Peverell, and through some magical event, he ends up in a situation where he has multiple romantic interests or a harem. Maybe it starts with Harry exploring his heritage related to Peverell and as he delves deeper, he attracts the attention of different characters, both from the wizarding world and perhaps some new characters created for this fanfiction. They are all drawn to him because of his new - found connection to Peverell and his unique magic.
One popular story could be 'Harry's Dark Ascent'. In this, Harry embraces his darker side and forms a harem around him. The story often focuses on his newfound power and how he interacts with the various characters in his harem, each with their own unique personalities and relationships with Harry.
One interesting plotline could be the main character, as the Harem Lord, having to balance the different magical abilities and personalities within the harem. For example, some members might be from different Hogwarts houses, bringing in their unique traits. Another could be dealing with rivalries among the harem members while also facing off against Voldemort or other dark forces.
I'm not sure if it's a particularly popular genre. There are so many different types of fanfiction in the Harry Potter world, and while some might be interested in stories involving Harry Potter and Lord Peverell in a harem - type situation, it might not be as mainstream as other themes like Harry's adventures at Hogwarts or his battles against Voldemort. It really depends on the niche interests within the large and diverse fanfiction community.
Hermione could be one of the characters in the harem. Her intelligence would be an asset to Harry, even as a Dark Lord. She might be torn between her loyalty to the original Harry she knew and her feelings for this new, darker version. Ginny could also be part of it. Given her connection to Harry in the original story, her presence in the harem could add an interesting dynamic, especially if she tries to change Harry back to his old self.
One interesting plot could be Harry Potter, as the Dark Lord, having to balance his newfound power with the relationships in his harem. Each character in the harem might have different motives and loyalties, creating internal power struggles within the group.