In this type of fanfiction, the exploration of the human psyche beneath the masks is a big theme. Batman and the villains all wear masks, literally and metaphorically. In a yaoi context, they start to strip away those masks for each other. There's also the theme of sacrifice. Batman might be willing to sacrifice his principles a bit for the villain he has feelings for, and vice versa. This adds a lot of depth and drama to the stories. And of course, the theme of attraction between two very different personalities, which is what makes yaoi - inspired fictions so interesting in general.
One popular 'batman x villain yaoi fanfiction' might be 'Shadows of Desire'. It explores the complex relationship between Batman and the Joker in a yaoi - inspired way. Another could be 'Dark Temptations' which delves into the psychological aspects of their relationship.
Typically, in superman x batman yaoi fanfiction, there will be a romantic or sexual relationship depicted between Superman and Batman that is not part of the original comic canon. The stories might focus on their emotional connection, with a lot of emphasis on their personalities interacting in a new way, like Superman's more idealistic nature against Batman's brooding and calculating side.
Another theme is redemption. Some fanfictions explore the idea that the villains in Batman's 'harem' could be redeemed through their relationship with him. It's like Batman's influence starts to change them, and they might start to use their skills for good instead of evil. It's a really interesting take on the characters.
One idea could be that the villain somehow gets amnesia and Batman has to decide whether to use this to his advantage or try to rehabilitate the villain. Another could be a scenario where the villain and Batman are forced to team up against a greater threat that endangers Gotham. Maybe a new, extremely powerful villain emerges and Batman realizes he needs the knowledge and skills of his regular foes to stop it.
One possibility could be that Batman, after facing one too many betrayals in Gotham, decides to take a different path. Maybe the constant struggle against crime with little real change in the city makes him cynical. He could start using his skills and resources to control the underworld instead of fighting it. For example, he might start dictating which criminals can operate and where, creating a new order that is still dark but under his command.
I'm sorry, but I don't really have a specific recommendation for superman x batman yaoi fanfiction as it involves non - canonical and often fan - created content that may not be widely accessible or appropriate in all contexts.
There's also 'Batman and the Villainous Harem'. In this fanfiction, the author explores how Batman's moral code clashes and also meshes with the motives of the villainesses in his harem. It delves into the psychological aspects of each character and how they interact in this unique scenario. The story is filled with action and some unexpected twists as Batman tries to keep Gotham safe while dealing with his newfound 'harem' situation.
The Joker could be a great villain. Imagine him getting his hands on some ghostly technology or artifacts from Danny's world. He would use it in his own chaotic and unpredictable way, causing mayhem in Gotham and also attracting Danny's attention. Danny and Batman would have to work together to stop the Joker's mad schemes.
It's unique because it takes two characters with such complex and well - established personalities like Joker and Batman and flips their relationship on its head. In normal DC Comics, they are arch - enemies. But in yaoi fanfic, their relationship is explored in a whole new light. Writers can play with their power dynamics, their mutual understanding (or lack thereof) in a way that is very different from the original canon. It gives a fresh perspective on these beloved characters and their relationship.