It could be a very interesting novel. Maybe it's about a villainess who has reached an extremely high level in terms of her 'villainy'. She might have extraordinary powers or schemes at level 99. For example, she could be manipulating the entire kingdom's politics or be in a fierce rivalry with the protagonist.
The 'villainess level 99 novel' might revolve around a complex character, a villainess. She could be in a world of nobles, magic or some other fictional setting. Her level 99 status could imply that she has mastered all kinds of villainous tactics. She might be constantly in conflict with the protagonist or other characters. There could be a backstory about how she became such a high - level villainess, like maybe she was wronged in the past and is now seeking revenge in a rather extreme way. There could also be a love interest who tries to change her or is drawn to her despite her villainous nature.
Since I haven't read the novel, I can't say for sure. But typically, there would be the villainess herself. There might also be a hero or heroine who opposes her. And there could be side characters like her servants, allies or enemies in her villainous plans.
First, you need to come up with a unique and interesting character design for the villainess. Make her have complex motivations and personality traits. Also, think of a captivating plot that keeps readers engaged.
Well, 'A Villainess for the Tyrant' manga is appealing because it offers a fresh take on the typical romance tropes. The world-building is also quite impressive and draws you in.
One thing that could make the 'level 99 villainess novel' stand out is the exploration of power dynamics. With the villainess at level 99, there would be a great deal of power at her disposal. The novel could show how she uses this power, whether it's for domination, revenge, or something else entirely. It also might show how other characters react to her extreme power, which could create a lot of interesting scenarios and conflicts.
The main problem might be the struggle to change people's perception or the difficulty in finding true allies. Plus, there's often the burden of living up to the villainous image while still trying to have some depth and complexity.