I don't know the exact main characters in 'Witches of Brooklyn Graphic Novel'. But thinking about other witch - themed stories, there could be an older, wise witch who acts as a mentor to the younger ones. And of course, there are likely to be the young witches at the heart of the story. They might be different in personality, with one being more adventurous, another more cautious. And perhaps there are some human characters who are important too, for example, a local detective who stumbles upon the witches' activities and becomes involved in their world.
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.