There were many anime works where the female lead was the villain, such as Naruto's Thousand-Hand Pillar, Death Note's L, One Piece's Nami, and so on. These female protagonists were often the protagonists of the righteous side in the story, but in the end, they became the villains, showing their unusual personalities and motives.
There were many novels where the female lead was a villain, such as Xiao Xun Er in "Battle Through the Heavens", Lin Dong in "Martial Yin Yang" and so on. The female protagonists of these novels were sometimes evil and sometimes unconventional, but their stories were all wonderful and worthy of readers to read.
One popular 'Villain x Heroine Fanfiction' is 'The Redemption of the Dark Lord'. In this story, the villain starts to question his evil ways because of the heroine. Another is 'Love in the Shadows' where they are forced to work together. And 'Unexpected Alliances' which shows how their relationship evolves from hatred to love.
What you want to ask might be " Reincarnated as the evil lady who only has Otome Game Destroyed Flag ". This is a light novel by Satoshi Yamaguchi, and the illustrations are done by Hita Kanami.
The story was about Yoshimura Sakura's death in a traffic accident and her reincarnation as Katarina Kraas, the villain in the Otome game " The Perfect Prince." In order to avoid the flag, she began to move.
While waiting for the anime, you can also click on the link below to read the classic original work of " Full-time Expert "!
First, understand the characters well. Know what makes the villain bad and the heroine good. Then, create a believable scenario for them to interact. For example, they could be thrown into a situation where they have to rely on each other. Don't rush the relationship. Let it develop gradually.
I'm not a novelist. I'm a fan of online literature. I can't provide any information about novels. However, in real life, it was more common for the female protagonist to be killed by the villain. This could be due to the need of the plot, the setting of the character, and so on. Some novels would create a powerful villain who would use various means to threaten the safety of the female protagonist and eventually defeat her. Such a plot could enhance the story and the reading ability of the novel.
It could be a mad scientist who was once a colleague of Professor Utonium but turned evil. He might create some mutant creatures to attack the city and the Powerpuff Girls.
In Western fantasy novels, the female protagonist and the villain were reborn together.
Throne of Darkness
The story takes place in a world full of magic and mystery. The female lead was a young female mage who possessed powerful magical abilities, but she embarked on an evil path because of her pursuit of power. She and the villains tried to achieve their ambitions by obtaining the power of the Throne of Darkness.
In the process of rebirth, the female protagonist found that she not only had the previous strength, but also gained more precious wisdom and experience. Together with the villain, she experienced a series of adventures and challenges, and finally overcame the difficulties to protect the world from the invasion of evil forces.
Not only did the novel have intense battles and adventures, but it also had many profound characters and emotional descriptions that made the story even more fascinating.