Another theme is chaos and adventure. Since Harley Quinn is often associated with mayhem in Gotham, the OC gets dragged into her wild adventures. They might face off against other villains or try to outwit the Batman together, which makes for exciting reading.
One common theme is identity. The oc, being Harley Quinn's child, has to figure out who they are. Are they going to follow in their mother's footsteps or forge their own path? Another theme is family. Even though Harley has her own quirks, the oc might still have a strong bond with her or struggle with the idea of family due to Harley's lifestyle.
Another theme is friendship. Despite their differences, Harley and the OC form a bond. It could start as a reluctant partnership but develop into a real friendship over time. Like in some fanfictions where they go through tough situations together and learn to trust each other.
One common theme is friendship. Often, the female oc starts as a stranger to Harley Quinn and they gradually become friends. They support each other through various challenges in the Gotham underworld.
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.
Power dynamics is another theme. Given Harley Quinn's complex relationship with power, especially in relation to the Joker, the male oc can bring a new element to this. Maybe he has his own power struggle within the DC underworld, and his relationship with Harley Quinn either complicates or simplifies that struggle. It could also involve themes of loyalty and betrayal, as in the world of DC, alliances can be fickle.
One common theme is the redemption of Harley Quinn. In many fanfics, she tries to break free from the Joker's influence and find a new path, often with Batman's help or at least his begrudging acceptance. Another theme is their complex relationship, whether it's a romantic one or just a mutual understanding that defies their traditional 'villain - hero' dynamic.
One common theme is redemption. Harley Quinn has a complex past, and in many fanfics, including those involving Harry, she is on a path to redeem herself. Another theme is friendship or an unlikely alliance. Harry and Harley Quinn coming from different backgrounds and yet finding common ground.
A prevalent theme is often about relationships. It could be her relationship with the father of the child, if it's the Joker, how that dynamic changes. Or it could be about her new relationships she forms with other characters who support her during the pregnancy, like other female characters from the DC universe.
One common theme is Harley's struggle with her new identity as an expectant mother. Given her chaotic and often unpredictable nature, the fanfics might explore how she copes with the idea of bringing a new life into the world.
Friendship is also a big theme. Many fanfics show them forming an unlikely bond. They might start off as enemies or strangers but end up as friends who support each other. It's interesting to see how their different backgrounds and values contribute to this friendship. Like in some stories, Harley helps Wonder Woman understand the darker side of humanity while Wonder Woman helps Harley find her moral path.