Another plot might involve Catwoman stealing something really important from Batman, not just jewels or artifacts but something that could expose his secret identity. Then Batman has to try to get it back without revealing who he really is, leading to a complex game of cat and mouse (pun intended).
In some fanfiction, there could be a scenario where Catwoman is framed for a crime she didn't commit. Batman initially believes she's guilty but as he investigates further, he discovers the truth. This leads to a change in their relationship as he realizes he misjudged her and they end up working together to clear her name and catch the real criminal.
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.
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 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.
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 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.
The Penguin often makes an appearance. He can add an extra layer of chaos and villainy to the story. His devious plans can either get in the way of Batman and Catwoman's relationship or be a catalyst for them to work together more closely.
One interesting plot could be Clark and Lois working together to expose a conspiracy in Gotham that involves both Superman and Batman. Maybe they discover that a powerful criminal organization is trying to pit the two heroes against each other for their own gain. They use Lois' investigative skills and Clark's powers to gather evidence and try to bring peace between the two vigilantes.
A frequent plot in Batman vs Doomsday fanfiction is the exploration of Batman's limits. How far will he go to stop Doomsday? Will he cross moral lines? There are also stories where Doomsday is brought to Gotham by a villain who wants to see the city destroyed. Batman then has to protect his city against this seemingly unbeatable foe. Some fanfictions also play with the idea of Doomsday having a connection to Batman's past, like being related to an old case or an experiment Batman was involved in.
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.
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 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.