One unique plotline can be found in 'A New Trinity'. The story is set in an alternate universe where Batman, Wonder Woman and Catwoman are the founding members of a new superhero league. They have to deal with not only super - villains but also the politics and public perception of their new group. This plotline offers a fresh take on the characters and their relationships, exploring how they can work together on a larger scale.
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 fanfic that stands out is 'United They Stand'. It imagines a scenario where the three heroes must put aside their differences and work together. The writer beautifully weaves their backstories into the plot, making it more than just an action - packed adventure. It also explores the relationships between them, like the potential romantic tension between Batman and Catwoman, and the mutual respect between Wonder Woman and Batman.
For Batman, Catwoman and Wonder Woman fanfic, you can look for ones that focus on character development. For example, a fanfic could show how Wonder Woman's Amazonian values influence the way she interacts with Batman and Catwoman. Maybe she tries to teach them some of her combat techniques. Or a fanfic could explore Catwoman's struggle between her criminal past and her newfound alliances with the two heroes. It could also be interesting to see how Batman's brooding nature affects the dynamic of the trio as they face various challenges in Gotham and beyond.
A good fanfic with these characters would be one that challenges the norms. Instead of the typical good - guy - vs - bad - guy scenarios, it could explore moral gray areas. Maybe Catwoman is caught in a situation where her actions could be seen as both right and wrong, and Batman and Wonder Woman have different views on how to handle it. It should also have engaging dialogue that reflects the personalities of the characters. For example, Batman's terse commands, Catwoman's sassy remarks, and Wonder Woman's noble statements. This kind of attention to detail makes a fanfic truly great.
One possible plotline could be that Batman sacrifices himself to save Wonder Woman from a powerful enemy. Maybe he takes on a self - destructing device or holds off a horde of villains while she escapes. Another could be that he is poisoned by a new and deadly toxin, and in his final moments, he imparts some crucial knowledge or advice to Wonder Woman.
The idea of alternate universes is also quite popular. For example, a universe where Catwoman is a hero from the start and partners with Batman and Wonder Woman more closely. Or a world where Wonder Woman has different powers and how that affects her interactions with the other two. Redemption arcs, especially for Catwoman, are also common. Writers explore how she might fully turn to the side of good and what that means for her relationships with Batman and Wonder Woman.
One possible plotline could be that Batman and Wonder Woman are forced to work closely together on a mission that spans multiple dimensions. As they face various challenges, they gradually realize their feelings for each other. For example, Batman, who is usually so stoic, starts to open up to Wonder Woman about his past traumas, and she in turn shares her own insecurities about being an Amazon in a man's world.
Well, Tumblr can be a great place too. There are many blogs dedicated to superhero fanfiction. You might need to dig a bit, but often bloggers share their own fanfics or recommend good ones. Also, some Reddit communities, like r/Batman or r/DCcomics, sometimes have threads about great fanfiction involving these characters.
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.
There are also fanfics that put Batman and Catwoman in alternate universes. In some of these, they could be in a world where Gotham has a different set of rules or they themselves have different powers. It's really fun to read these and see how the relationship between them changes in these unique settings.
A common plotline could be that Batman gets involved with another female character. Maybe he starts to develop feelings for Catwoman due to their shared history of being on the wrong side of the law sometimes. This new relationship on Batman's part could make Wonder Woman feel betrayed and her heart broken.