What are some interesting plot ideas for batman x batgirl fanfiction?

One idea could be exploring Batgirl's internal struggle after the events of 'The Killing Joke'. Maybe she has nightmares and has to face her own fears in a new way. Another could be Batman's reaction to Batgirl's changed state of mind, and how he tries to help her without being too overbearing.

One idea could be that the OC is a new vigilante in Gotham and Batgirl takes them under her wing to train them. This could lead to a lot of action - packed scenes as they fight crime together and the OC learns from Batgirl's experience.

One plot idea could be that Supergirl and Batgirl team up to take on a new super - villain in Gotham. This villain has the ability to manipulate technology and is causing chaos. They combine Supergirl's super strength and flight with Batgirl's detective skills and martial arts expertise. Another idea is that they are transported to an alternate dimension where they have to find a way back home while facing different versions of their friends and foes. And a third idea could be that a powerful alien artifact is found in Metropolis and both girls must protect it from various forces that want to use it for evil, all while learning more about each other's worlds and abilities.

One idea could be a story where Batgirl has to save Batman from a new and powerful villain. Maybe this villain has a special weapon that can neutralize Batman's skills, and Batgirl uses her unique abilities, like her gymnastic skills and her knowledge of technology, to turn the tables.

Another interesting fanfic could be set in an alternate universe. In this universe, Batman is a young rookie and Batgirl is his more experienced mentor. It would be a role - reversal story where Batgirl teaches Batman the ropes of fighting crime in Gotham. This could include her showing him how to use his gadgets more effectively and how to read the criminal underworld better.

Maybe X - 23 is on the run from some anti - mutant forces and finds herself in Gotham. Batman initially suspects her but then realizes she's being hunted unjustly and decides to help her. They then have to fight off the hunters while also dealing with Gotham's regular villains.

A cool plot could be that there's a mysterious threat targeting all of Batman's allies. Robin and Batgirl team up to not only find out who's behind it but also to protect each other. Along the way, they share some personal stories from their pasts that bring them closer together.

One plot idea could be that Batman and Hawkgirl have to team up to stop an ancient threat that is related to Hawkgirl's past. Maybe a powerful villain from her home planet has come to Earth, and Batman's detective skills combined with Hawkgirl's combat abilities are needed to defeat it.

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 idea could be that Harry, with his magical skills from the wizarding world, somehow gets transported to Gotham City. He teams up with Batgirl to fight a new kind of villain who is using a combination of magic and technology. Harry could use spells like Protego to shield them from attacks, while Batgirl uses her martial arts and gadgets.