The main character is surely the 'we can do it girl'. She may be a young girl starting out in life, full of dreams but facing many obstacles. Her parents could be characters in the story, with different views - one might be very supportive while the other might be more traditional and hesitant. There could also be a co - worker or classmate who initially competes with her but later becomes an ally. All these characters interact and contribute to the development of the 'we can do it girl' story.
I think the main idea is unity among girls. In the story, girls might be working together towards a common objective, whether it's in career, education or social change. By uniting, they are able to break through limitations and prove that they can do great things. For instance, if it's a story in a business context, girls might be collaborating to start their own successful company, despite the odds stacked against them in a competitive male - centric business world.
I don't know the exact 'we can be heroes story', so I can't say for sure who the main characters are. They could be regular people like a school teacher, a construction worker, and a young student who all find themselves in a situation where they need to be heroes.
Since we have no details about 'the 100 girl story', we can only guess. Maybe there is a leader among the 100 girls who is a main character. Or there could be a few girls who are different from the rest in some way, like having unique skills or personalities, and they are the main characters.
Without having read the book, it's difficult to name the specific main characters. But in a novel with such a title, we can assume there is a character who has a complex backstory related to the things they do when no one is watching. There could be a love interest or a family member who becomes involved in the discovery or consequences of these actions in the dark. There may also be an antagonist who either causes or exacerbates the situations where these hidden actions take place.
Typically, in a novel like this, there could be a character who is haunted by their past actions that were done in the dark. Maybe a person who has a mysterious background and is trying to hide it from others. There might also be a nosy neighbor or a detective - like character who is trying to uncover the secrets related to these 'things in the dark' that the other characters are involved in.
One important step is to connect her with professional help such as counselors or therapists who are trained to deal with trauma. Also, we can offer practical help like finding her a safe place to stay if needed. In the 'abused girl story', it might be that she is being bullied at school. Then we can inform the school authorities to take measures to stop the bullying.
Well, surely the girl herself is a main character. And probably her family members, like her parents or siblings who would be deeply affected by her vanishing. There might also be a detective or a police officer if it's a mystery - style story, as they would be trying to solve the case of her disappearance.
There could be the girl, of course. And perhaps there is a love interest in the story. If the girl can't help her feelings of love, then the person she loves would be a main character. There might also be a mentor - like an older person who gives her advice on how to deal with whatever it is she can't help doing.
Not having read the story, it's a mystery. However, in many stories with a girl as the central focus, there could be a sidekick - a best friend who is with her through her journey. And there might be an authority figure, like a teacher or a boss if it's set in a school or work - related environment, who has to deal with the girl's 'can't - help - it' situations.
As I don't know the exact story, I can't say for sure. But I assume the girl herself is a main character. There might also be characters like her family members, friends or antagonists who interact with her and are important to the story.