I don't have specific information about the main characters in this light novel. But typically, the succubus herself would be a main character. There might also be other characters like a wizard or a knight who could be involved in her story, either as friends, foes, or love interests.
Well, it might explore the concept of a succubus in a unique way. Maybe it shows how she uses her powers in different situations. It could also be about her relationships, whether it's with humans she might be attracted to or with other creatures in the fictional setting. The story could revolve around her trying to fit into a world that might not fully accept her kind.
I'm not sure exactly who the main characters are without reading it. But it could be a new character created specifically for this light novel, or it might focus on a lesser - known Marvel character.
I don't know specifically as I haven't read the novel. It could be a lone hero type character.
The protagonist is of course a central character. However, without having read the whole novel in detail, it's hard to name all the main characters precisely. But generally, there would be characters who are in positions of power, like lords or generals, and those who oppose or support the protagonist in his journey.
Obviously, the succubus would be one of the main characters. She could be joined by other demons, like her friends or enemies in the demon world. And then there would probably be some human characters. For example, a priest who tries to exorcise her or a young man who is attracted to her despite knowing what she is. These characters would drive the plot forward through their interactions.
The main character is surely the succubus. However, there might be other important characters such as a human she has a special connection with. This human could be either a target of her seduction or someone who she forms an unexpected bond with. There may also be an antagonist, perhaps a powerful demon who wants to control her or a hunter who is after her.
The main character is the fated villain himself. There are likely also heroes or protagonists who oppose him, though specific details would depend on the novel's development.
Probably some rival characters as well. These are other wizards who are also competing for the title of Wizard King or have their own agendas that conflict with the protagonist's. Their interactions with the main character add a lot of tension and excitement to the story.
I'm not sure exactly as I haven't played it myself. But generally, a visual novel often has a story with characters and a plot. Maybe it's about the experiences of a succubus character, her adventures, relationships or something related to the nature of a succubus in a fictional world.
Obviously, Bella is the main character as she is the succubus. There might also be a love interest, perhaps a human or another supernatural being. For example, in some fanfics, there could be a vampire character who becomes intrigued by Bella's succubus nature.