One great 'Joker OC Harley fanfiction' could be 'The New Face in Gotham'. It's about a new original character who gets involved with the Joker and Harley's chaotic world. The story has great character development for the OC and shows how they interact with the iconic duo.
You can try Archive of Our Own (AO3). It has a large collection of fanfictions, including many 'Joker OC Harley' ones. Just use the search bar and type in relevant keywords.
Well, a frequent theme is the struggle for power. The Joker is a power - hungry character. In these fanfictions, the OC might be trying to gain power within the criminal underworld that the Joker and Harley operate in. Also, the theme of redemption can sometimes be there. Maybe the OC tries to redeem Harley from her life with the Joker. There are also themes of loyalty and betrayal as the characters' relationships shift and change.
Yes, there are some. You can start by looking on fanfiction websites like Archive of Our Own. There you might find unique takes on the relationship between the Joker, an original character (OC), and Harley Quinn. Some stories might explore the darker aspects of their relationships, while others could be more about the OC's influence on the dynamic duo.
One good 'Joker Harley Quinn OC fanfiction' could be one where the OC is a new villain in Gotham who tries to disrupt the relationship between Joker and Harley Quinn. Maybe they start by causing misunderstandings between them, like forging messages from Harley to Joker saying she's leaving him for someone else. This could lead to a whole new dynamic where Joker is on a rampage looking for Harley, while Harley is confused as to why Joker suddenly turned on her.
One idea could be that the OC is a new villain in Gotham who catches the attention of both Joker and Harley. Maybe the OC has a unique power or skill that makes them a threat or an ally. For example, the OC could have the ability to manipulate minds, which Joker wants to use for his own evil plans, while Harley sees the OC as a potential friend who can understand her chaotic nature.
First, give the OC a unique backstory. For example, if they are from a poor part of Gotham and had to fight their way up, it would shape their character. Second, give them a distinct personality trait like being overly curious or having a strong moral code that clashes with the Joker and Harley's world.
To create a believable OC, start with their backstory. If they're in the world of Joker and Harley, they should have some sort of connection to Gotham's underworld. Maybe they grew up in a rough part of the city and had to fend for themselves. This could shape their personality, like making them tough and resourceful.
One great 'Joker Harley OC Fanfic' is 'Harley's Redemption'. It delves deep into the character of Harley Quinn as an original character in a new, exciting story. Another one could be 'Joker's New Toy', which has a unique take on the relationship between Joker and Harley. And 'The OC's Impact' shows how an original character can change the dynamic in the Gotham underworld.
Their relationship could develop through shared experiences. For example, they could go on heists together and during those times, Joker could start to see Harley in a different light. He might notice her intelligence and loyalty more and more.