I'm not sure exactly as I haven't read the novel. But there's probably a protagonist who is the one becoming part of the villain's family. Then there would be the members of the villain's family, like a powerful and maybe cruel father figure in the family who is the main villain.
The main character is surely the one who is on the journey of becoming part of the villain's family. There could be a mother figure in the villain's family who is both loving towards her own family but also has a dark side. And perhaps a sibling in the family who is conflicted about the new addition, the protagonist.
In 'becoming the villians family novel', power and corruption could be important themes. The villain's family might be involved in power - seeking and corrupt practices, and the main character has to navigate through this. Also, identity is likely a theme as the character is changing their own identity by becoming part of this new family.
I'm not sure specifically as I haven't read the exact novel. But usually, in such novels, the main villains could be power - hungry individuals. They might be those who have been wronged in the past and now seek revenge in a very extreme way, making them villains in the eyes of others.
The head of the villain's family could be really interesting. They are likely to have a complex personality, being a villain but also having a family side. Their decisions and actions would shape the family's future and the story as a whole. They might be cruel in some ways but also show unexpected kindness to their family members.
Since I don't know the exact content of the novel, I can't say for sure. But it might have a main character who is on the path to becoming a dragon. There could also be a mentor figure, perhaps an old dragon or a wise wizard who guides the protagonist.
The villain himself is often very memorable. He might have a complex personality, not just pure evil. Maybe he has a soft spot for his family, which makes him more three - dimensional. The main character who is becoming part of the family is also memorable as they navigate the strange new world of the villain's family. And there could be a wise old family member, like an elder, who has a lot of secrets and knowledge about the family's past and future.
Since I haven't read the novel, I can't say for sure who the main characters are. It could be a lone hero on a quest to become a god.
I'm not sure as I haven't read the novel. But typically, there would be characters who were once close to each other. Maybe it's a couple like Jack and Jill who used to be in love but now are growing apart. Or it could be a group of friends such as Tom, Dick, and Harry who are starting to see each other as strangers due to some events.
Perhaps there is a character who has always been interested in Japanese pop culture, like anime and manga, and decides to move to Japan to fully immerse themselves. They could be one of the main characters, along with some Japanese friends they make who help them understand the deeper aspects of Japanese culture.
The protagonist is usually quite interesting. They are the ones thrust into the world of the villain's family and have to navigate through all the challenges. Their journey of adaptation and trying to fit into a family with a not - so - good reputation is captivating.
Since we don't know the 'becoming sex story' in question, it's impossible to determine the main characters. It could be about an individual's journey, in which case the main character would be that person, or it could involve multiple characters in a more complex narrative about sexual relationships or identities.