A plot could involve the reader having a special ability that both Batman and the Joker are interested in. Batman wants to use it for the good of Gotham, while the Joker wants to corrupt it for his own amusement. The reader has to navigate between these two very different forces, and in the process, discovers more about themselves and the nature of good and evil in Gotham.
Another plot could involve Fem Batman and Joker in a sort of cat - and - mouse game where the Joker is specifically targeting Fem Batman because she's a woman. He might underestimate her at first, but she proves to be just as formidable as the male version. This would explore themes of gender and power in the Batman - Joker dynamic.
Perhaps in the fanfiction, the Female Joker creates a series of mind - bending illusions across Gotham. Batman has to navigate through these illusions to find the real her and stop her from causing more chaos. Along the way, he starts to question his own sanity as the Female Joker's games get more and more intense.
A plot where they are friends in a post - apocalyptic Gotham is really engaging. In this world, they have to work together to survive against new threats like mutant gangs. Batman tries to bring some order while the Joker brings his unique brand of survival skills. Their friendship is tested as they have to deal with limited resources and moral dilemmas.
One interesting story could be where Joker tries to turn Gotham against Batman in a very psychological way in the fanfiction. He spreads rumors and false evidence to make the citizens doubt Batman's motives.
Well, sometimes in such fanfiction, there are alternate universes. For example, a world where the Joker and Batman have to team up against a greater evil. This flips their typical dynamic on its head and makes for an exciting read.
One interesting joker reader fanfiction could be about the reader being a detective who has to face off against the Joker. The tension and mind games between them make for a great story.
First, you need to understand the characters well. Batman is a brooding, justice - seeking hero, while the Joker is a chaotic and unpredictable villain. The reader character should have their own distinct personality, goals, and flaws. For example, if the reader is a detective, they might be overly confident in their abilities which gets them into trouble with both Batman and the Joker.
One interesting storyline could be Joker devising a new, elaborate plan to take over Gotham City that involves some wacky and unique traps. Batman, of course, has to use his Lego - themed gadgets and skills to stop him. Another could be a story where Joker and Batman are forced to team up against a greater threat, like a powerful alien invasion in the Lego universe. Maybe they start to understand each other a little better during this time.
One idea could be exploring a world where Batman and Joker have to team up against a greater evil. Maybe a powerful alien force arrives in Gotham and they realize they need to combine their skills, even if reluctantly.