In a fanfiction, the Joker could also develop by forming an unlikely alliance. He could team up with a hero or an anti - hero, not out of good intentions but for his own self - serving reasons. This alliance could change his perspective on things and how he approaches his evil plans, thus developing his character in a new way.
For Batman, his character could be developed by showing more of his internal struggle. In the Arkham Knight scenario, he's facing a lot of challenges. Maybe he starts to question his no - kill rule more when he sees the destruction the Arkham Knight is causing. With Catwoman, her thieving skills could be explored in more detail. She could use her skills not just for personal gain but also to help the people of Gotham in a more subtle way.
The Female Joker's character can be developed by exploring her backstory. Maybe she had a difficult childhood, like being bullied or growing up in poverty. This could have led to her developing a warped sense of humor and a desire to create chaos as a way to cope.
One way is by exploring his past in more detail. The fanfic could reveal new events from his childhood or his early days as a criminal. This can give more depth to his character and help explain his motives. For example, if the OC discovers something about Bane's past that Bane has been hiding, it can create an interesting dynamic between them.
One interesting plot idea could be a fanfiction where the Joker somehow comes back to life in Arkham Knight. Maybe he was only in a coma and wakes up with a new, even more deranged plan to take over Gotham. He could start by manipulating the inmates in Arkham again, creating chaos from within the asylum.
One way to develop Jane is through her moral compass. She could start off as a morally ambiguous character, not really sure which side she is on. As she interacts with the Joker more, she is forced to make decisions that will define her character. For instance, the Joker might offer her a large sum of money to help him with a heist. She has to decide between the easy money and doing the right thing. Through these kinds of moral dilemmas, her character can be fleshed out and made more complex in the Dark Knight Joker Jane Fanfiction.
The Joker in the Batman New 52 story evolves in a complex manner. His character is more unhinged than ever. He shows a greater understanding of Batman's weaknesses and uses them to his advantage. For instance, he might target Batman's friends or places that hold sentimental value for Batman. His evolution also includes a more grotesque and disturbing aesthetic. His makeup and overall look seem to be a reflection of his inner state of mind. He is constantly pushing the boundaries of what is considered acceptable behavior, even for a villain in Gotham. His actions have a wider impact on the city, causing not only physical damage but also psychological trauma to the citizens.
In 'Batman: The Dark Knight', the Joker develops from being just a criminal nuisance to a real threat to Gotham's very existence. His actions become more extreme, like when he kills important people. He also shows his ability to manipulate people's minds, which grows throughout the story.
The development of Batman could involve him learning new ways to deal with the Female Joker's unique brand of villainy. He might have to adapt his detective skills and combat techniques. As for the Female Joker, her backstory could be gradually revealed, showing how she became who she is. This could lead to her having moments of vulnerability, which would make her a more complex character in the fanfiction.
To develop the Joker's baby daughter, you can focus on her growth. Start from her infancy, showing her innocent and vulnerable side. As she gets older, give her some traits that are a mix of her father's and her own. For example, she has the Joker's ability to think on his feet but uses it for good. She could also have a kind heart, which is constantly at war with the dark influence of her father's reputation. Her appearance could also play a role in her character development. Maybe she has the Joker's signature green hair or some other unique physical feature that makes her stand out and affects how others perceive her and how she perceives herself.
At first, Batman would be shocked and a bit confused. But quickly, his detective instincts would kick in. He would view the deaged Joker as a new and unexpected threat. He'd start gathering information about how the deaging occurred, in case it was part of a larger, more sinister plan. Batman would also be very careful not to underestimate the deaged Joker. He might try to isolate the Joker in a secure location to prevent him from causing chaos in Gotham. And he'd be constantly on the lookout for any signs of the Joker's old, devious self emerging from this new, younger form.