A theme that frequently shows up is the idea of family. Harley Quinn, who has had a rather chaotic family life herself, tries to create a better family for the baby. Also, the theme of growth is there. As she takes care of the baby, she grows as a person, learning things like patience which she didn't have much of before.
The theme of unexpected relationships is also common. Harley might form new friendships or alliances because of the baby. For example, she could end up working with a hero she used to be enemies with, all because they both want to keep the baby safe. And there's often the theme of discovery, as Harley discovers new sides of herself while taking care of the baby.
Family is also a theme. Some fanfictions might explore what if Harley Quinn had a different family. Maybe she is adopted by a loving family who tries to shield her from the dark side of Gotham. This could lead to a story about her growing up with a new sense of self - worth and different values from the Harley Quinn we know.
Physical injury and recovery is also a common theme. Harley Quinn getting injured in battles or dangerous situations and then having to heal both physically and mentally, which makes for interesting storytelling in 'harley quinn hurt fanfiction'.
One common theme is her relationship with the Joker. Many fanfictions explore the toxic and complex nature of their relationship. Another theme is her friendship with Poison Ivy, which is often portrayed as a strong and supportive bond. Also, her transformation from a sidekick to a more independent character is a recurring theme.
One common theme is redemption. Often, the OC might be involved in trying to help Harley find a new path, away from her villainous ways. For example, in some fics, the OC could be a hero - type character who believes in Harley's potential for good.
A major theme is the chaos factor. Harley Quinn is known for her chaotic behavior, and in male Harley Quinn fanfiction, this chaos is often explored in different ways. It could be his actions causing mayhem in Gotham or his internal mental chaos. Also, redemption is sometimes a theme. The idea that this male Harley Quinn might be trying to break free from his past misdeeds or a bad influence.
One common theme is transformation. Bella often goes through a significant change to become like Harley Quinn, both in appearance and personality.
The theme of redemption or loss of self can also be present. As a vampire, Harley might feel like she's losing her true self and try to find a way to reverse the transformation. Or she could see it as a new opportunity for redemption and use her new powers in a different way compared to her previous actions as a 'normal' Harley Quinn.
One common theme is redemption. Harley Quinn trying to redeem herself in Batman's eyes and him falling for the new her. Another is the idea of breaking free from toxic relationships, like Harley's with the Joker, and finding something healthier with Batman.
Well, the theme of transformation is quite common. Harley may transform from a villain or anti - hero to a more heroic figure because of her relationship with Batman. There's also the theme of trust. Batman has to learn to trust Harley, who has a checkered past. And Harley has to learn to trust Batman not to use her or betray her. These themes add depth to their relationship in the fanfiction world and make for some really engaging stories.
Common themes include the idea of morality. Batman has his strict moral code, while Harley Quinn's moral compass is a bit more...skewed. Their encounters in fanfiction often highlight this contrast. And there's the theme of Gotham itself. The city serves as a backdrop and sometimes almost a character, with its dark alleys and seedy underworld being the setting for their battles.