Well, Bella is obviously one of the main characters since it's about her ability to read minds. Edward would also be a main character as he is closely related to Bella in the Twilight universe. His vampire nature and his relationship with Bella would play an important role in the fanfiction.
Sometimes, even the villains like Voldemort or his Death Eaters play important roles. Harry could read their minds to gain an upper hand, and they, in turn, might try to find ways to block Harry's power or use it against him.
Perhaps a plot where Bella reads the minds of the werewolves and finds out things about their pack dynamics that no human was supposed to know. This could lead to some tense moments between the werewolves and the Cullens as they try to figure out how much she knows.
It's a complex matter. Fanfiction often plays with different moral concepts. Bella controlling minds could be considered ethical if there are proper limitations and justifications. For example, if she only uses it to stop villains who are about to cause great harm and she has no other way to do so. However, if she uses it casually on her friends or for minor self - interests, it would likely be seen as unethical.
Another possible main character could be a rival. Someone who is jealous of Bella's flying ability and tries to undermine her. This creates conflict and drama in the fanfiction.
There could be a female character, Sofia, who is another member of the mafia. She sees Bella as a threat at first, thinking she'll steal her position or the attention of the men in the mafia. But as time goes on, they might form an unlikely alliance. There may also be a young and ambitious mafia underling named Antonio, who is always looking for ways to climb the ranks and his actions often impact Bella's situation in the story.
The main character is always Bella in this type of fanfiction. However, new characters could be introduced as well. For instance, a blind mentor who has learned to live fully with blindness could be added. This character could guide Bella and help her accept her condition. Or there could be a villain who tries to take advantage of Bella's blindness, which would then lead to a conflict where Bella has to use her wits and other strengths to overcome the villain.
There could be Edward. Even if Bella is now immortal, Edward might still play a significant role. He could be either her eternal love or her adversary depending on how the fanfiction is written. Another character could be Alice. Since Alice has her own special abilities, she might be there to help Bella navigate the new world of immortality. For example, she could foresee some of the challenges that Bella will face. Also, Jacob might be a main character. His relationship with Bella, whether it's a friendship or something more complicated, could be further explored in the context of Bella's immortality.
There could be Edward. Maybe he is involved in Bella's life with her psychic powers. He might be curious about her abilities or even try to protect her from the consequences of using those powers.
Well, the middle man is obviously a main character. He's often the one who connects different elements of the plot, whether it's the unsubs or the BAU team. Then there are usually members of the BAU team like Hotchner, Reid, and Morgan who interact with the middle man in various ways.
Obviously, Bella is one of the main characters. There might also be other Slytherin students like Draco Malfoy. Since it's a Slytherin - centered fanfiction, we could expect to see some of the more well - known Slytherin characters interacting with Bella.