Harry is the main human character. Among the vampires, there could be a vampire who was once a wizard and turned into a vampire. This character would have a unique perspective as he understands both worlds. There might also be a vampire hunter who has a change of heart and ends up helping the vampires rescue Harry. All of these characters would interact and drive the story forward in the fanfiction.
Obviously, Harry is one of the main characters since the title mentions he is being rescued. As for the 'dark' side, it could be Voldemort or some of his Death Eaters, or perhaps some other dark - themed original characters created for the fanfiction.
One possible plotline could be that the vampires, despite their dark nature, are drawn to Harry's unique magical aura. They see him as a key to some greater power or mystery in the wizarding world and rescue him from a dangerous situation, like a dark wizard's lair. Then, Harry has to navigate his new relationship with these vampires while also dealing with the implications it has on his standing in the wizarding community.
Obviously, Harry Potter himself is a main character as he is the one being rescued. Then there would be the Delacours, mainly Fleur Delacour. She is a strong and resourceful witch. Her family members, like her sister Gabrielle or her parents, could also be involved in the rescue. They might work together as a family to save Harry.
Perhaps there could be a vampire clan leader named Viktor. He would be responsible for Harry's upbringing in the vampire community. He would teach Harry about the rules and traditions of the vampires. There might also be a young and rebellious vampire, Damien, who becomes like an older brother to Harry and shows him the ropes in a more unconventional way.
Perhaps some well - known vampire characters from other vampire - related stories could be incorporated. However, they would need to be adapted to fit into the Harry Potter universe. For example, a vampire like Lestat from 'The Vampire Chronicles' could be reimagined as a character in this fanfiction. He could bring his own brand of charm and danger to the story.
Often, there's a strong and brooding male vampire as one of the main characters. He might be an ancient vampire with a tragic past.
Obviously, Harry Potter and Voldemort would be the main characters. Since it's about an 'evil Harry Potter', he would be a central figure with a different personality than the canon Harry. He might be cruel, power - hungry and have a disregard for the rules of the wizarding world. Voldemort, on the other hand, would be the rescuer, perhaps seeing Harry as a tool or a kindred spirit in his evil plans.
I think Dobby could also be a significant character in this fanfic. Since he has connections to both the Malfoys and Harry. He might be the one who gives the Malfoys the idea to rescue Harry or helps in the rescue in some way. Also, Voldemort or his Death Eaters could be important in the background as the threat that Harry needs to be rescued from. Their presence would constantly loom over the story, making the Malfoys' actions more dangerous and significant.
Dumbledore could be a main character. He might be aware of Harry's situation and be secretly guiding him from afar, trying to make sure Harry doesn't lose his wizarding identity. Also, a powerful vampire under Lord Vampires, like a vampire princess or prince, could be a main character. They could befriend Harry and teach him about vampire culture.
Well, obviously Lincoln is one of the main characters. And then there would be the vampires. There might also be some side characters like Lincoln's friends or allies who help him in his fight against the vampires.