One interesting plot could be that Batman and Catwoman team up to save Gotham from a new and powerful villain, and during their adventures, their feelings for each other deepen. They start to see beyond their usual cat - and - mouse game.
In some fanfiction, Catwoman might be injured while on a heist. Batman, instead of arresting her, takes her to the Batcave to nurse her back to health. This situation forces them to confront their feelings and they begin a secret, romantic relationship. As they try to keep it a secret from the rest of Gotham, they face many challenges both from their own identities and the outside world.
One interesting plot could be Catwoman in the 'Batman Beyond' universe stealing a high - tech item that has the potential to disrupt the new Gotham's power grid. Batman Beyond then has to track her down, leading to a series of high - speed chases across the city's skyline. Another plot might involve Catwoman forming an unlikely alliance with Batman Beyond to take down a new criminal organization that is using advanced technology for illegal activities. And perhaps a plot where Catwoman discovers a secret about Batman Beyond's identity and uses it to her advantage in a heist.
One interesting plot could be that Batman and Catwoman are forced to team up against a greater threat in the fanfiction. Maybe a new supervillain emerges who is more powerful than any they've faced before, and they have to put aside their differences to save Gotham.
Another plot might be that Catwoman, as a yandere, tries to change Batman's identity. She thinks that his life as Bruce Wayne is what keeps him away from her fully. So, she devises plans to expose his secret identity, believing that once he's just Batman all the time, he'll be more devoted to her.
One plot idea could be that Catwoman is on a heist and Batman tries to stop her as usual, but during the encounter, they share a moment where they realize their mutual attraction. They start secretly meeting up, away from the chaos of Gotham's crime world, and gradually fall in love. Another idea is that they are forced to work together to take down a common enemy much bigger than their usual foes. In the process, they see different sides of each other and their relationship deepens.
One interesting storyline could be Catwoman stealing a valuable artifact that has a connection to Batman's past. This forces Batman to track her down, but as he does, he discovers that Catwoman has her own reasons for taking it that are more complex than simple theft. Another could be a situation where Catwoman and Batman are forced to team up against a greater threat in Gotham, like a new super - villain who is out to destroy the city. And a third one might be a story where Catwoman tries to frame Batman for a crime he didn't commit, leading to a tense cat - and - mouse chase between them.
One idea could be that Batman and Catwoman kiss during a moment of truce while they are teaming up to take down a greater threat in Gotham. Maybe they are on a rooftop, surrounded by the chaos of the city below, and in that moment of shared purpose, their feelings surface and they share a passionate kiss.
In another scenario, Batman takes Catwoman to their favorite rooftop in Gotham where they often meet. He has set up a beautiful, simple dinner with candles. After a heartfelt conversation about their journey together, from being enemies to lovers, he pulls out a ring with a diamond that has a unique shape, perhaps resembling the bat - symbol, and asks her to marry him.
One possible plotline could be Batman and Catwoman's wedding being interrupted by one of their villains. Another could be them dealing with how to combine their very different lifestyles while married. Maybe they also have to face public scrutiny as Gotham's most unlikely couple.
In some fanfictions, the plotline might be that there's a hidden treasure in Arkham City that both Batman and Catwoman are after for different reasons. They start as rivals but as they face the various threats in Arkham City, like the other inmates and the corrupt guards, they realize they need to work together. This story could explore how they negotiate their differences and build a stronger bond in the context of Arkham City.
One interesting storyline could be them partnering up to take down a new and powerful criminal organization that is threatening Gotham in a way neither of them can handle alone. They have to put aside their differences and work together, relying on each other's unique skills.