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.
A new character could be introduced as the father. A heroic type who had a brief encounter with Harley and now she has to figure out how to navigate having a baby with someone from a completely different world. This could also be a way to explore Harley's ability to change and adapt to new situations.
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.
It could be one of her close friends in the story. Maybe someone she has had a long - standing relationship with and the pregnancy was an unexpected but not entirely unwelcome result of their relationship.
Another option could be a mysterious figure. For example, a character from another dimension or a new character introduced specifically for this plot twist. This could add an element of mystery and intrigue to the story.
It could be a long - time love interest like Stefan. Their relationship has had its ups and downs, and a pregnancy could add a whole new layer of complexity to their story.
It could be her long - time friend Gary. They've known each other for a long time and there could have been some unspoken feelings between them that led to this situation.
Another option is that it could be a character who has been her friend for a long time. Their relationship could have evolved over time and led to this situation. For example, a close friend who has always been by her side and they had a moment of passion that resulted in the pregnancy.
Neji could be a potential father. Their long - standing friendship and mutual respect could have developed into a deeper relationship over time, leading to the pregnancy.
It could be her long - time boyfriend. They've been in a loving relationship for a while, and this pregnancy could be the next step in their relationship journey. Maybe they've been talking about starting a family, and now it's finally happening.
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.
Another possibility is one of the SHIELD agents. They work closely together, and over time, a relationship could have developed. It might be an agent who has always been there to protect Darcy during their various adventures, and now he has a new role as the potential father of her child.