The main characters are predominantly the slaves. These are the people who had the courage to seek education even though it was against the rules. Sometimes, there are characters like escaped slaves who come back to share their knowledge. There might also be characters within the slave community who act as leaders in the educational efforts, inspiring others to learn and resist through knowledge.
In slave school stories, the central characters are the enslaved individuals. Some might be children with an eagerness to learn in the face of great danger. There could also be the slave owners, who play the role of the oppressors trying to prevent the slaves from getting educated. And then, there are those brave souls, like abolitionists or underground educators, who risked their lives to help the slaves gain knowledge.
Since I don't know the exact'school slave story', it could be students who are the main characters. They might be the ones facing the difficult situations that make them feel like slaves.
In slave boy stories, the central character is, of course, the slave boy. He experiences the brutality and unfairness of slavery first - hand. There might also be a slave master's son or daughter. Their relationship with the slave boy can be complex, ranging from friendship to further exploitation. Another main character could be a runaway slave who serves as an inspiration for the slave boy. This runaway slave has tasted freedom and might encourage the boy to strive for the same.
The main character is often the slave boy himself. He is usually the one whose experiences and growth we follow throughout the story.
Typically, you'll see the main characters from the original High School DxD series like Issei Hyoudou. He might be in a different role in the fanfic, perhaps more involved in the'slave' aspects of the story. Rias Gremory could also be a main character, maybe as a figure of power who has'slaves' under her command.
In Jabba's slave girls stories, Princess Leia is a prominent character. She was captured and made to be a slave girl by Jabba. Her character represents strength and defiance even in such a demeaning situation. Jabba the Hutt is also very important as he is the oppressor. Additionally, there are other unnamed slave girls who contribute to the atmosphere and story. They might be used to show the general state of slavery in Jabba's palace and how they interact with the more well - known characters.
Since I haven't read 'slave to the darkness novel', I can only speculate. There could be a protagonist who is forced into this state of being a slave to darkness. Maybe there is a mentor - like figure who tries to help the main character break free, or there could be other characters who are also trapped in the same situation and they bond over their shared plight.
Since I haven't read the 'slave to darkness novel', it's hard to say for sure. However, the main characters might include a protagonist who is on a path to self - discovery while being a slave to darkness. There could also be an antagonist representing the pure essence of the dark power that controls the slaves. And perhaps there are other supporting characters who are either fellow slaves or those trying to free the slaves from the clutches of darkness.
Obviously, the boy slave himself is one of the main characters. He is the central figure around whom the story revolves. There may also be the slave master, who represents the oppressive force in the boy's life.
There are the king, who is likely in a position of great luxury and control, and the slave, who is probably at the bottom of the social hierarchy. These two characters are central to the story as their relationship, whether it's one of conflict, friendship, or mutual growth, drives the plot forward.
Perhaps there is a fellow slave or a sympathetic free person in the novel. This character could play an important role in the slave girl's journey, either by providing support, friendship, or a different perspective on her situation.