One of the best is 'The Dark Knight Returns'. It presents an aged Batman coming out of retirement in a gritty, alternate future of the DC Multiverse. It's a story that challenges the traditional view of superheroes and their place in society.
Fanfic in the batman multiverse expands it by reimagining relationships. We could have a Batman who is in a romantic relationship with Catwoman in one universe and enemies in another. It also allows for different interpretations of the Batman code. Maybe in one multiverse, Batman is more willing to kill his enemies to protect Gotham, which is a huge departure from the traditional non - killing Batman. This all adds new layers and possibilities to the already rich Batman universe.
Sure is! Batman has been a staple of DC Comics for a long time. His stories and adventures are part of the DC universe. DC has built a rich and complex world around him.
In batman multiverse fanfic, the concept of a female Batman or a Robin from a different universe becoming Batman is quite fascinating. It challenges the traditional gender roles in the Batman universe. There could also be a multiverse where the Bat - family has different relationships. For instance, Dick Grayson could be the main protector of Gotham instead of Bruce Wayne, and the story could explore how this change affects the city and the other characters.
The Batman Who Laughs is extremely popular. He combines the intelligence and skills of Batman with the insanity of the Joker. His twisted nature and his dark plans make him a fascinating character in fanfiction.
One interesting concept is the twisted versions of well - known heroes. For example, a Batman who has completely given in to darkness and uses extreme and unethical methods to 'protect' Gotham. Another is the alternate versions of the Justice League where their powers are corrupted and they become more of a threat than protectors.
There are a ton of Batman DC comics. Different publishers, storylines, and reprints make it impossible to say exactly how many. But you can bet it's a huge number!