Since I haven't read it, I can't be certain. But I would assume the demon girl is one of the main characters. There may also be other demons or characters that interact with her, like perhaps a strict demon who is in contrast to her lax nature.
The 'demon girl tale of a lax demon novel' could potentially center around a female demon character. Maybe she has a laid - back or 'lax' attitude compared to other demons in her society. The story might explore how this sets her apart, the challenges she faces because of it, and the relationships she forms. For example, she could be lax about her duties in the demon realm, which leads to her getting into all sorts of interesting and dangerous situations as she tries to find her own path among her kind.
The main character, of course, is central to the story. He has a group of friends and allies, like the brave warrior who is excellent in combat and the cunning thief who can gather valuable information. These characters each have their own personalities and goals, and together they form an interesting cast in the 'tale of the demon god novel'.
In this 'tale of demon and god novel', the main character is the central figure. Besides, there might be some powerful demons who are antagonists, and some benevolent gods who could be either allies or have their own agendas. Maybe there are also other characters like the protagonist's friends or family members who are involved in his journey in this world of demons and gods.
In some 'demon girl novels', there could be other demon characters as well. For instance, her family members or other demons from her clan who play important roles. They might have different views on how the demon girl should interact with the human world or use her powers. Additionally, there could be a mentor - like figure, perhaps an old and wise demon or a human with special knowledge, who guides the demon girl on her journey.
Obviously, the demon lord is one of the main characters. They are likely to be at the center of the story, driving the plot forward with their actions and decisions.
Obviously, the demon lord is one of the main characters. There might also be his closest minions or advisors who play important roles.
A local witch or wizard could be a main character. They sense the presence of the demon and come to help the girl. They might have their own motives, like they want to use the demon for their own gain or they truly want to save the girl from the demon's clutches.
Obviously, the demon lord himself is a very important character. Then there might be his loyal servants or followers. Maybe there is a wise old wizard who is either an ally or an enemy. There could also be a brave knight who stands against the demon lord at first but later realizes there is more to him.
There could be a wise old mentor figure. This person might be aware of the girl's actions or the existence of demons in general. They could try to guide the girl, either to stop her from summoning the demon in the first place or to help her once the demon is there.
Demon Copperhead is surely a main character. There could be other characters such as a mentor figure who helps him in his journey, or a rival who makes his life more difficult. Also, there might be some characters from his family, like a mother or father figure, who influence his development.