Well, in bad girl romance stories, the female character often defies traditional gender roles. She might be rebellious, like not following the expected behavior of a 'good girl'. For example, she could be outspoken or have a bit of a wild streak.
One popular 'bad girl' romance story is 'Wuthering Heights'. Catherine Earnshaw is a bit of a 'bad girl' in the sense that she is wild and passionate, defying the social norms of her time. Her relationship with Heathcliff is intense and full of drama.
A sense of rebellion can also be a factor. Sometimes, a good girl might feel restricted by rules and expectations, and she rebels against them, turning into a bad girl. For example, if she has overly strict parents, she might go against all they stand for. Also, a major life change like moving to a new place or experiencing a trauma can make a good girl abandon her good - girl ways and become bad. She might lose her sense of self and purpose and start making bad choices.
Peer influence is a common factor. Just like in the story I mentioned before, a good girl can be easily influenced by the wrong crowd to become bad. Another factor could be family issues. If a girl doesn't get enough support or love from her family, she might turn to bad behavior as a form of rebellion.
One common theme is rebellion. Bad girls and bad boys often go against the norms of society or the rules in their schools or communities. For example, they might skip classes or break curfews. Another theme is the transformation. They start off as 'bad' but through their relationship with each other, they may begin to change for the better or at least understand the importance of certain values. Love against all odds is also common. Their 'bad' reputations make it difficult for them to be together, but they still fight for their relationship.
One popular 'bad girl romance novel' could be 'Fifty Shades of Grey' series. The female lead, Anastasia Steele, has a certain 'bad girl' element in her as she steps into an unconventional relationship. Another might be 'Gone Girl', where Amy Dunne is a complex character with a 'bad girl' side in the way she manipulates situations in her relationship.
Luna. In some stories, Luna can be a bad girl name. She might be a sly character who uses her charm to deceive others. Another one could be Scarlett. It gives an impression of a fierce and perhaps not - so - nice girl, like a femme fatale. Then there's Raven. It has a dark and mysterious vibe that can be associated with a bad girl in a story.
Luna can be a bad girl name for a story. In some dark fantasy stories, Luna might be a conniving witch who uses her magic for her own gain. Another one could be Raven. A character named Raven could be a brooding and rebellious girl involved in all sorts of trouble in a teen drama - like getting into fights at school or sneaking out at night.