As we don't know the details of 'little sisters sec story', it's impossible to say who the main characters are. It could be the little sisters themselves, or there might be other characters involved like their parents, friends or neighbors.
I'm not sure specifically what 'little sisters sec story' is about as the name is rather ambiguous. It could potentially be a story related to little sisters in a secondary or secret context, but without more information it's difficult to say.
As I don't have the actual 'little sisters graphic novel' in front of me, I can't say for sure. But most likely, the little sisters themselves would be main characters.
The most prominent character in these graphic novels is Karen Brewer. She is the heart of the stories. Alongside her, there are other characters such as her step - siblings. Her step - sister Hannie and her step - brother Ricky are often in the stories too. And don't forget about her babysitters. They are sometimes part of the narrative, as they are in the world of babysitting which is related to Karen's family life.
Obviously, Kristy is a main character. There might be her classmates as well. If the story involves her after - school activities, there could be coaches or club leaders in it. For example, if she's in a sports club, the coach would be an important character. Or if she volunteers somewhere, the person in charge there could be a character too. But really, it's all speculation without more information.
Karen is one of the main little sisters. She's very creative and has a vivid imagination. Then there's Kristy's little sister, who is also an important character. Their personalities and the things they do drive a lot of the storylines in the graphic novels.
Since it's a story about sisters, the main characters are likely the sisters themselves. There might also be other supporting characters like their parents, friends, or perhaps a neighbor who has some influence on their lives.
Since I don't know the exact 'three sisters' story, if it's a family - centered story, the main characters would be the three sisters themselves, and perhaps their parents or other family members who play important roles in their lives.
Since I don't know the exact '3 sisters stars story', I can only guess. The main characters are likely the three sisters who are associated with the stars. They could be goddesses, fairies, or just ordinary beings with a special connection to the stars.
In the 'children of sisters story', the principal characters are no doubt the children born to the sisters. These children could have different personalities, ages, and interests. They may be the ones driving the plot, whether it's through their friendships, arguments, or adventures together. The sisters may also be important characters, as their actions and decisions could have an impact on their children's lives and thus be an important part of the story.
The main characters are of course the three sisters.