Harry can be developed by showing his growth from the boy - wizard we know in the original series. In this fanfiction, he might be more open - minded towards the vampire due to his post - war understanding of different magical beings. Fleur can be portrayed as more than just a beautiful Veela. She could be a strong - willed witch with her own set of skills and knowledge. The vampire could be developed as a complex character. He could have a code of ethics that surprises Harry and Fleur, like he only feeds on animals and helps protect the wizarding community in secret.
For Harry, you could focus on his sense of justice. Maybe he's initially wary of the vampire but his experiences with Voldemort have taught him not to judge too quickly. Fleur can be developed by highlighting her Veela allure and how it affects the vampire. The vampire could be developed by giving him a tragic backstory. For example, he was turned against his will and is trying to find a way to reverse it. This could create an interesting dynamic between the three characters.
Fleur could use her Veela charm to try and disarm or distract vampires. Since Veela have a certain allure, it might work on vampires as well.
Their relationship could start with mutual respect. Harry respects Fleur's beauty and magical abilities, and Fleur respects Harry for his courage. This could gradually turn into friendship as they train together for the tasks. For example, they could practice spells and share strategies.
Fleur could be shown as more independent and brave. Since she's taking it upon herself to save Harry, it shows her courage. Maybe she becomes more confident in her own abilities outside of the Triwizard Tournament context.
Their relationship could develop through a shared love of a particular magical creature. For example, they both discover a new, endangered magical creature and have to work together to protect it. This shared mission could bring them closer.
Often, Dark Hermione's character is developed by showing her descent into the dark side. Maybe she starts to question the limitations of the 'good' magic she has been taught and becomes frustrated. For Dark Fleur, it could be through her desire for more power and recognition. Her beauty and confidence could be turned into tools for her dark pursuits.
Hermione would probably be a bit skeptical at first. She might worry that Harry is rushing into things. But once she sees how happy they are, she would be supportive. Ron, on the other hand, would be more accepting from the start, especially if there are good feasts at the wedding.
Harry can be developed by exploring the conflict between his vampire instincts and his human - like emotions towards 'She'. His 'big cock' trait could be shown as a source of his self - assurance which he uses to face the internal and external challenges. For example, he could use it to stand up to other vampires who oppose his relationship with 'She'.
For Harry, you can explore his growth in a non - magical world. He might initially struggle without his wand and the familiar magical environment. But as he teams up with Batgirl, he could learn to adapt and use his wits and basic magical knowledge in new ways. For example, he could use his knowledge of potions to create makeshift antidotes for toxins in Gotham. Batgirl, on the other hand, could learn about the existence of magic from Harry, which could expand her view of the world. This new knowledge could make her more open - minded when facing unusual threats in the future.
For Harry, you can focus on his growth beyond what we see in the original series. Maybe he becomes more cynical after all he's been through, and Acheron challenges his views. For Acheron, explore his past more deeply in the context of the fanfiction. Have Harry learn about his traumas and help him heal in some way.
Often, Luna Lovegood can be found in such fanfictions. Her unique and dreamy nature could bring a different dynamic to the harem. Neville Longbottom might also be involved in some way, perhaps as a friend who supports the harem and helps them out in times of need. There could also be some foreign exchange students or magical creatures in human form that end up in the harem for various reasons.