Well, obviously there are the girls who have the crushes. They can be from all different backgrounds and personalities. There's Harry, of course, the object of their affection. And then there might be their friends who either support their pursuit or try to discourage them. Sometimes there are also rival characters who also like Harry and create conflict.
The characters also include those who are in the periphery but still impact the story. For example, teachers or family members of the girls. Teachers might notice the girls' distraction because of their crush and try to set them straight. Family members could be either very understanding or completely against the idea of the girls having such a big crush on Harry, adding more layers to the story.
One common theme could be the girls' internal struggle with their feelings. They might be shy about expressing their huge crush on Harry. Another theme could be the fantasies they have about getting closer to him, like going on adventures together or sharing a special moment.
The main characters are usually the popular girls themselves. There's often a leader, like the 'queen bee' who is confident, stylish, and rules the social scene. Then there are her followers, who might be more submissive or have their own hidden agendas.
Typical characters in 'live girls novel' include the protagonist, usually a young girl. She is often brave and curious, eager to explore the world around her. There are also her friends, who might have different personalities like the shy one, the outgoing one, etc.
Typically, there are the main girl characters. They are often diverse in personality, such as one being shy and introverted, while another is bold and outgoing. There might also be a best friend character who is always there for the main girl. And then there could be a male love interest, who is charming and has his own set of qualities. There may also be a rival character, who competes with the main girl in some way, like for a role in a play or in a sports competition.
There are often side characters like rivals in love. They add tension to the story. These rivals could be someone who also has feelings for the love interest and tries to win them over. And then there are the schoolmates or colleagues, who might observe the girl's relationship from the outside and offer different perspectives or start rumors.
Typical characters include the ambitious career - driven city girl.
Sure, it's totally normal. Many people develop feelings for fictional characters because they can be very appealing and charming.
Typical characters include the wise old mentor. This person has a lot of experience in the business world and gives Harry valuable advice. There might also be a nosy neighbor or acquaintance who is always trying to get in on Harry's business or find out his secrets. Another character could be a charity worker. Since Harry is a billionaire, his interaction with those involved in philanthropy is common, and this character can add a different dimension to the story, like trying to convince Harry to donate more to certain causes.
One common trope is the 'forbidden crush'. For example, a Gryffindor having a crush on a Slytherin, which goes against the house rivalries in Hogwarts. It adds tension and drama to the story.
Definitely Harry Potter himself. He's always at the center of the action and in fanfiction, he can have new and unexpected powers. Also, Luna Lovegood can be really interesting as she often has unique insights and can use her strange but effective magic in battles.