One unique concept is a fanfiction where Batman and Catwoman switch roles for a day. Batman has to try and steal something while Catwoman tries to stop crime. Another is a story set in an alternate universe where they are both normal people, but still drawn to each other in the same way. And there could be a fanfiction where they have to work together to save Gotham from a magical threat.
The idea of Starfire's naivete meeting Batman's cynicism is also unique. For example, in 'Innocence and Experience', Starfire's positive outlook on life clashes with Batman's darker view. This creates an interesting tension and development throughout the story as they influence each other's perspectives.
In some fanfics, like 'The Amazon, the Bat and the Cat', the plotline involves a magical artifact that can only be retrieved by the combined skills of Batman, Wonder Woman and Catwoman. This forces them to cooperate in a way they haven't before, with Wonder Woman using her strength and magic, Batman his detective skills and Catwoman her agility.
A scenario could be that Batman gets injured badly during a fight. Catwoman has to take care of him and in the process, she sees a more vulnerable side of him. This makes her realize that he's not just a symbol, but a man. Batman, on the other hand, sees her kindness and realizes that she has more depth than he initially thought. This changes their dynamic, with Batman being more open to her ideas and Catwoman being more committed to helping him in his mission.
One scenario in the fanfiction could be that Batman gets jealous when he sees Catwoman flirting with a rich businessman during one of her heists. He might start to question her motives and their relationship. This jealousy could cause him to act out of character, perhaps being more aggressive or possessive towards Catwoman than he normally would be. And Catwoman, being the independent character she is, would not take kindly to this sudden change in Batman's behavior, leading to a rift between them that would be interesting to explore in the story.
One common theme is the push - and - pull relationship between them. They are often on opposite sides of the law, but there's an undeniable attraction. Another theme is redemption. Catwoman may be trying to turn her life around because of Batman's influence. Also, the theme of secrecy and trust comes up a lot. They both have secrets, and the fanfictions often explore how they deal with trusting each other.
One popular theme is redemption. Catwoman, being a thief, might be on a path to redemption with Batman's influence. Another theme is the power of love. Their relationship, whether it's a romantic one or a complex friendship, can change the course of their actions. Also, the exploration of their dual identities is quite common. How they balance their normal lives with their masked personas and how that affects their relationship with each other.
A way to develop their relationship in this type of fanfiction is through joint parenting. They might have different approaches to raising their kids. Batman could be very strict about discipline and training, while Catwoman might be more lenient and focus on teaching the kids about the importance of freedom. Through these differences, they learn to understand each other better and grow closer as a couple. Also, they could face external threats to their family which forces them to rely on each other more, strengthening their bond.
She might be very surprised at first. After all, Batman is not one to show his emotions so openly. But then she would likely be overjoyed. She has deep feelings for Batman too, and this proposal would be a confirmation of their complex relationship.
Well, one unique aspect is the age - gap dynamic that can be explored. Catwoman is usually older and more experienced, while Robin is young and idealistic. Fanfictions often play with this contrast. For example, in some stories, Robin looks up to Catwoman as a mentor in a way, despite her being a criminal.
One interesting concept could be exploring alternate universes where Batman has different powers or allies. For example, a fanfiction might imagine a world where Batman has the ability to control shadows like a metahuman. Another concept could be delving deeper into the relationship between the original Batman and the new Batman in Batman Beyond. It could show how the legacy and lessons are passed down, and how the new Batman copes with the huge shoes he has to fill.