The two main characters are Harry and Severus. Harry's evil nature sets the stage for a lot of conflict and drama. Severus, on the other hand, has to come to terms with being mated to this new, evil version of Harry. They both bring their own histories, personalities, and powers to the story, and the way they interact with each other and the other characters in the fanfiction world is what drives the plot forward.
Obviously, Harry is one of the main characters. His being evil changes the whole dynamic of the story. And Severus is also crucial. Their relationship as mates forms the core of the fanfiction. Severus, with his past experiences and his own moral compass, has to deal with an 'evil' Harry, which makes for a very interesting character interaction.
The main characters are clearly Harry and Severus. Harry, in this fanfiction, is depicted as evil, which is a big departure from his original character in the canon. And Severus, who has his own complex personality, is mated to Harry.
One possible interesting plot could be the conflict it creates within the wizarding world. If Harry is evil and mated to Severus, it would shock everyone. Their relationship would likely be a source of great turmoil, with friends and foes alike trying to figure out how to deal with this unexpected union.
Harry is surely a main character. As for the mutant, it could be a mutant with powers like telepathy or super strength. If it's a crossover fanfiction, it might be a popular mutant like Wolverine or Jean Grey. However, in an original take, the mutant could be a completely new character with unique powers and a backstory that ties in with Harry's story in interesting ways.
Delta Squad members are often paired with Sev. Fixer, for example, is frequently in stories with Sev as they have a strong bond from their time in the squad. Another character is Boss, who in many fanfictions is shown leading Sev and the rest of the squad through various missions.
I'm not entirely sure. While there is a large amount of Harry Potter fanfiction out there, the specific 'harry is evil and mated' concept might be a bit more niche. It could be that it exists on some smaller fanfiction platforms or within certain groups of fans who like to explore darker and more unconventional storylines.
One common theme could be the exploration of power. If Harry is evil, his use and abuse of magic power in a different way than in the original story. And the'mated' aspect might bring in themes of loyalty and possessiveness in relationships that are twisted due to his evil nature.
A vampire hunter could be a key character. They might initially see Harry as a target too because of his association with the vampire. This would create a lot of tension as Harry and his mate have to either convince the hunter that they are not a threat or fight against them. And don't forget about Dumbledore (assuming this is in the Harry Potter universe). His reaction to Harry's new situation would be very interesting to explore.
It could also be that the main characters include some of the well - known Twilight characters in addition to the mated pair. For instance, Bella or Edward might play a role in the story. Maybe they are friends or mentors to the mated couple, guiding them through the challenges that come with being in a relationship that involves a shifter in the Twilight - like setting.
One popular 'evil harry is mated to tom' fanfiction is 'Dark Alliances'. It explores the complex relationship between an evil - leaning Harry and Tom in a really interesting way, with a lot of plot twists.
Obviously, Laufey and the human are the main characters. Laufey being one of the key figures, and the human, who is his mate, is also central to the story.
In addition to Bella and the wolf pack members, there might be some side characters from the original 'Twilight' series that could still be relevant. For instance, Charlie Swan, Bella's father. His reaction to Bella's new situation with the wolf pack could be an interesting aspect. Also, some of the vampires from the Cullen family might make appearances to add to the drama, even if they are not the main focus in this particular fanfiction.