Another idea is that the father of the baby is a mystery, and Harley goes on a journey to figure out who it is. Along the way, she discovers things about herself and her past relationships. This could involve her visiting old friends or foes and reminiscing about different parts of her life.
One possible storyline could be Harley Quinn adjusting to the idea of motherhood while still dealing with her chaotic life. Maybe she's trying to figure out how to raise a child in a world full of villains and heroes. Another could be her relationship with the father of the baby, whether it's the Joker or someone else, and how that dynamic changes during the pregnancy.
One possible storyline could be Fem Harry getting inspired by Harley Quinn's chaotic and unpredictable nature. She might start to break the rules at Hogwarts in a more fun - loving way, like Harley does in Gotham. For example, she could play pranks on the teachers that are more elaborate and wild. Another storyline could involve Fem Harry having a split - personality of sorts, where the Harley - inspired side comes out at certain times, leading to some interesting interactions with her friends and enemies. Maybe she even forms a little 'gang' of her own within Hogwarts, similar to Harley's associations in Gotham.
Poison Ivy might be a candidate in some creative fanfiction interpretations. Their relationship has always been very close, and if there was some kind of magical or experimental situation, Ivy could potentially be the other parent. This would lead to a very unique family dynamic and story arc.
The Joker is an obvious choice as he has a long - standing relationship with Harley Quinn in the original lore. Their complex and often toxic relationship could add a lot of drama to the pregnancy storyline.
A possible plot could be that Harley Quinn's sister is an undercover agent sent to infiltrate the criminal underworld of Gotham. She ends up getting involved with Harley and the Joker. As she gets closer to her sister, she realizes that Harley is more than just a crazy villain. She then tries to find a way to get Harley out of the criminal life while also dealing with Batman's suspicions of her true motives.
One possible plot could be that Harley Quinn discovers she's pregnant and tries to hide it from the Joker, fearing his reaction. Meanwhile, Batman somehow gets wind of it and feels a sense of responsibility to protect her, not just for the baby's sake but also because he realizes Harley is in a very vulnerable state.
Well, the plot could involve Harley Quinn and the Joker having an unexpected pregnancy. It could show how their relationship changes. The Joker might initially be dismissive or even angry, thinking it'll disrupt his plans. But Harley could be determined to have the baby and try to make the Joker understand the importance of family, or at least her version of it. There could also be a lot of drama with other villains or heroes reacting to the news of Harley being pregnant.
In some fanfiction, a really interesting storyline is when Harley and Ivy get separated for a while. It shows how much they rely on each other. Harley starts to lose her spark without Ivy around, and Ivy feels a bit lost without Harley's energy. When they finally reunite, it's a very emotional moment, and they realize how important their friendship is in the chaotic world of Gotham.
Well, the plot could involve a strange experiment that causes Harley Quinn to become pregnant. Nightwing gets involved because he's trying to figure out what's going on. As the story progresses, they have to deal with villains who want to use the baby for their own evil purposes. They might also have to deal with their own personal issues, like Harley's past relationship with the Joker and Nightwing's loyalty to Batman.
Harley's character could develop in many ways. She might become more protective and motherly, which is a big change from her usually wild and carefree self. This new - found sense of responsibility could make her question her relationship with Joker and the life of crime they lead.