For a Harley Quinn crossover fanfic, consider a crossover with the Teen Titans. Harley could befriend Raven and they could have an odd couple dynamic, with Harley's wildness and Raven's stoicism. Another idea is a crossover with Green Lantern. Harley might get her hands on a power ring somehow and use it in her own zany way. Or a crossover with Aquaman where Harley ends up in Atlantis and causes all sorts of underwater mayhem, perhaps teaming up with some of the more rebellious Atlanteans against a tyrannical rule.
One idea could be a Harley Quinn and Batman crossover. Maybe Harley decides to team up with Batman for a short while to take down a common enemy, like the Joker when he goes too far. Another could be a crossover with Wonder Woman. Harley could find herself in Themyscira and have to navigate the Amazonian culture while also causing some chaos. A third idea is a Harley Quinn and Deadpool crossover. Their similar chaotic natures could lead to a really wild and funny story.
One idea could be that Harley Quinn somehow gets transported to the Marvel universe. Maybe she teams up with Deadpool. They both have a crazy and unpredictable nature, so their interactions would be really interesting. They could go on a wild adventure fighting against some common enemy like Doctor Doom who is trying to take over both their worlds or something.
There's also a fanfiction where Harley Quinn crosses over with the Suicide Squad in a different scenario. It delves into the relationships between the characters in new and exciting ways. The author changes the dynamics of the team and Harley's role within it, making for a very engaging read. For example, Harley forms an unlikely alliance with one of the more reserved members, which leads to some really interesting character development for both of them.
One idea could be that they are both transported to an alternate dimension. In this dimension, all the rules are different. Deadpool's healing factor doesn't work as well, and Harley Quinn's usual weapons are useless. They have to rely on each other's skills and knowledge to find a way back home. Along the way, they meet strange versions of their friends and enemies, which adds to the hilarity and confusion.
One idea could be that they both get kidnapped by a mad scientist who wants to study their unique mental states. They then have to team up to escape the scientist's lair.
A Naruto Harley Quinn crossover fanfic might start with some kind of interdimensional rift that brings Naruto into Harley Quinn's world. Naruto, with his strong sense of justice, would likely be confused by the chaos and the different moral code in Gotham. Harley Quinn, on the other hand, would probably find Naruto's powers and his naivete quite interesting. She might try to use him for her own gain at first, but as the story progresses, they could develop an unlikely friendship. The fanfic could also explore how Naruto's ninja techniques would be perceived in the world of Batman and his rogues gallery. For instance, his shadow clone jutsu could be a real head - turner. And Naruto would have to adapt to the more modern and gritty setting of Gotham compared to his own feudal - like shinobi world.
A Naruto and Harley Quinn fanfic could be really interesting. It could start with Harley Quinn somehow ending up in the Naruto universe. Maybe she teams up with Naruto to fight some common enemies. For example, they might face off against an evil organization that wants to take over both their worlds. Her chaotic nature could bring a new dynamic to Naruto's more traditional heroic style.
A fanfic could explore a scenario where Harley Quinn, in her attempts to reform, crosses paths with Bruce Wayne. He initially distrusts her, but as they interact more, they start to understand each other on a deeper level. For example, Harley could be helping at a local shelter that Wayne also supports, and they gradually build a connection.
Well, in a great 'Harley Quinn Fanfic', the writer needs to understand Harley Quinn's backstory. By using elements from her past, like her time as a psychiatrist and her relationship with the Joker, it can add depth. The fanfic should also have a unique take on her relationships, whether it's with Poison Ivy or other characters. And the setting, like a vivid description of Gotham City, can really enhance the story.
Another plot could be a heist - like story. Harley Quinn has a wild plan to steal a valuable artifact from a heavily guarded museum. She recruits Katana because she knows Katana's sword skills will be useful. Along the way, they have to deal with other villains who also want the artifact. This leads to some really fun action scenes and comical banter between the two very different characters.
One idea could be that Harley Quinn and Deadpool team up to take on a common enemy in Gotham City. Maybe a new super - villain who has a plan to take over both the criminal underworld and the hero world. They could have a really chaotic and funny dynamic, with Harley's zany antics and Deadpool's fourth - wall - breaking humor.