I don't know for sure, but it could have a main character who is the painmaker themselves. There might also be characters who are the victims of this painmaker or those who try to stop the painmaker's actions.
Since there is little information available about 'painmaker graphic novel', it's difficult to determine the main characters accurately. However, if we assume based on the title, the most obvious main character would be the 'painmaker'. There might also be other important characters like the ones who oppose the painmaker's actions. For example, a group of rebels or a lone hero who stands up against the painmaker. There could also be characters who are related to the painmaker in some way, like a family member who is ashamed of the painmaker's actions or a former acquaintance who tries to bring the painmaker back to the right path.
As I haven't read 'painmaker graphic novel', I can only guess. There could be a central character who is on a journey of self - discovery, realizing they are a painmaker. Alongside them, there may be a mentor - like figure who tries to guide them away from causing pain, and then there could be the characters that are directly affected by the painmaker's actions, such as friends or family members.