I'm not sure as I haven't read it. But it could be the witches themselves. There might be a lead witch who drives the story forward.
Since it's a graphic novel about witches, there could be young witches who are just learning their powers. Maybe an old and wise witch who guides them. There might also be characters from the human world who interact with the witches, like a curious child or a skeptic adult.
I'm not sure specifically as I haven't read it, but likely there are witches as main characters.
In 'Witchcraft Works', Akuru Kagari is a significant character. She's a powerful witch who is often involved in protecting the male lead and using her magic in various ways in the story.
The main characters are likely the female pilots who were the Night Witches. Their leaders and the individual pilots who played significant roles in their missions would be the main focus.
Since I haven't read it, I can't say for certain. However, typically in a story about witches, there would be a lead witch who is very powerful or has some special ability. There might also be her friends or fellow witches who support her and together they form a coven. There could also be some characters from the non - magical world who interact with the witches and play important roles in the story, like a neighbor who starts to suspect something strange about the witches.
There might be a group of friends who are all young witches. One could be really good at potions, another at spell - casting, and they all support each other through their magical adventures. Maybe there's also a mentor figure, an older witch who guides the young ones and helps them when they get into trouble in the magical world.
I don't know for sure, but it's likely that there are some young witch characters. Maybe there's a headstrong young witch who is always getting into trouble. There could also be a more timid witch who is very powerful but lacks confidence.
The boy is the central character. He's a curious and brave boy who unfortunately has to face the terrifying witches. The Grand High Witch is a very important character among the witches. She is the leader, cruel and cunning, and she devises the plan to turn all children into mice. There are also other witches in the coven, each with their own personalities, but they all follow the Grand High Witch's lead.
The main characters are Diana Bishop, a witch, and Matthew Clairmont, a vampire.
The witches themselves are likely very interesting. Their powers, motives, and appearances would make them stand out. For example, the lead witch might have some unique magical abilities that drive the plot forward.
In the 'Witches of East End book story', the main characters are the members of the witch family. There are probably the mother witch who is likely to be very powerful and experienced. Then there are the daughters, each with their own unique abilities and personalities. They are all important as they face different situations together and their individual characters play a role in how the family deals with the various challenges that come their way.