Well, I think Scarecrow would be an interesting character to pair with the Joker. They both have a knack for spreading fear in Gotham, and their combined efforts could be truly terrifying. Additionally, Poison Ivy could be paired with the Joker. She has her own motives and methods, and when combined with the Joker's madness, it could lead to some unique and unpredictable stories. And of course, Commissioner Gordon. His no - nonsense attitude against the Joker's chaos would make for a great dynamic in fanfiction.
One interesting 'dark knight joker fanfiction' story could be about the Joker's origin from a different perspective. Maybe he was once an ordinary man pushed to the edge by society's cruelty. Another could be a story where the Joker forms an unlikely alliance with Batman for a common enemy. And there are also those that explore the Joker's relationship with Harley Quinn in a new and unique way within the fanfiction world.
One common theme is chaos. The Joker is all about creating disorder, and fanfictions often explore this further. Another theme is the battle between good and evil, with the Joker representing pure evil and the heroes trying to counter him. Also, insanity is a big theme as the Joker's mental state is a key aspect of his character.
The Dark Knight's version of the Joker adds an extra layer of darkness to their relationship in fanfiction. Writers might explore how the Joker's chaos affects Harley even more in this darker context. For example, Harley could be torn between her love for the Joker and the realization of the horror he spreads in Gotham.
One story about the Joker's scar in 'The Dark Knight' is that he gave himself the scar to prove a point about chaos and his disregard for his own physical appearance. He's a character who thrives on anarchy and the scar is just one of the many elements that add to his menacing and unpredictable nature.
The Dark Knight Joker story is mainly about the chaos and anarchy the Joker brings to Gotham. He's a deranged criminal with a warped sense of humor. He challenges Batman both physically and morally, creating all sorts of mayhem in the city, like his elaborate schemes to test the limits of the people of Gotham and Batman's resolve.
There are a few places to find good 'dark knight joker fanfiction'. Tumblr can be a source, as there are many bloggers who are into writing and sharing fanfiction, and you might stumble upon some great 'dark knight joker' stories there. You can also try Wattpad, although it has a more general range of stories, but with a bit of searching, you may find some interesting fan - created content related to the Joker from 'The Dark Knight'.
There might be a fanfiction where the Joker somehow survives and resurfaces during the events of 'The Dark Knight Rises'. It could detail his new schemes and how the Batman and the other characters react to his unexpected return. This would add a whole new layer of drama and conflict to the story.
One possibility in fanfiction for Joker's daughter could be a character who was hidden away for years. She might be discovered by Batman or some other Gotham character. Her existence could be a shock to the criminal underworld as well as the heroes. She could possess some of the Joker's traits like his unpredictability, but also have her own motives that are not entirely clear at first. She could be a wildcard in the complex world of Gotham's crime and heroics.