A cool batman fanfic could also be about a world where Bruce Wayne never became Batman. Explore how Gotham would be different. Maybe the villains would run amok without the Dark Knight to stop them, or perhaps someone else would rise up to try and fill the void, but in a very different way than Batman.
Another interesting batman fanfic idea is to explore Batman's early days as a vigilante in a more in - depth way. Show his struggles with learning how to fight crime effectively, how he built his first gadgets with limited resources, and his initial encounters with some of his well - known villains like Catwoman when they were both just starting out in their 'careers'.
One idea could be a story where Batman has to team up with his rogues gallery to fight a greater threat from outer space. Maybe the Joker, Two - Face and the Riddler are forced to put aside their differences when an alien race starts to invade Gotham. They find that Batman's strategic mind and their own unique skills are needed to save the city.
One idea could be exploring Batman's early days as a vigilante in more detail. Show his first encounters with the major villains and how he developed his crime - fighting techniques.
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.
A cool batman crossover fanfic idea might involve a crossover with the Avengers. Batman's strategic mind and detective abilities would be a great addition to the superhero team. He could help Iron Man with tech, or use his stealth to outwit Loki. Also, a crossover with the Doctor from Doctor Who could be fascinating. Batman could travel through time and space with the Doctor, solving mysteries in different eras.
Another concept could be that Alex is an amnesiac who has a connection to one of Batman's old foes. Batman tries to help Alex regain his memories while also protecting him from the bad guys who are after Alex because of his potential knowledge.
Another story idea is that the Joker somehow gets his hands on a powerful and mischievous Pokemon like Ditto. Ditto can transform into any other Pokemon, and the Joker uses it to create all sorts of mayhem in Gotham. Batman has to figure out how to stop the Joker and his shape - shifting Pokemon while also dealing with other criminals who see this as an opportunity to cause more trouble.
One idea could be that Raven is in danger from a new dark magic threat and Batman, with his detective skills, helps her track down the source. They start to learn from each other, Raven about Batman's human tenacity and Batman about Raven's otherworldly powers.
One interesting idea could be seeing Batman as a female and how she might approach crime - fighting differently. For example, she might use more stealth and manipulation in a different way than the male version.
One idea could be exploring Bruce Wayne's early training in more detail. Show his struggles and how he overcame them. For example, his first encounters with Ra's al Ghul's League of Shadows could be more in - depth, with new challenges and characters added.
One idea could be that Robin gets trapped in an alternate dimension where the villains are in control and Batman has to figure out a way to bring him back. Another could be a story where Batman is injured and Robin has to take on a major villain alone, learning to trust his own instincts more. Maybe a plot where they encounter a new, powerful ally who turns out to have a hidden agenda that threatens Gotham.