How about Gollum from Lord of the Rings? It seems really odd at first, but think about it. Gollum's sneaky nature and knowledge of dark places could be useful in Arkham Asylum. Batman could try to control Gollum's greed and use his skills to navigate the more dangerous parts of the asylum. And Gollum might be fascinated by Batman's shiny gadgets. It would be a very strange and interesting dynamic.
One idea could be that the Winchester brothers from Supernatural are investigating a series of strange murders in Gotham City. They cross paths with Batman who initially is suspicious of them. Eventually, they realize that a demon is behind the killings and they team up. Batman provides his detective skills and combat abilities while the Winchesters use their knowledge of the supernatural to defeat the demon.
Another one worth checking out is 'The Caped Crusader in RWBY'. It delves deep into how Batman's code of ethics might change or stay the same in the RWBY universe. It also has some great fight scenes where Batman uses his martial arts skills against Grimm, all while trying to understand the complex politics of Remnant.
One great Batman crossover fanfiction is 'Batman and the Avengers: A Dark Alliance'. It combines the gritty world of Batman with the super - powered heroes of the Avengers in an exciting way. The story has some great action scenes and interesting character interactions, like Batman's tactical mind clashing with Iron Man's high - tech approach.
One of the best elements is seeing Batman interact with characters from different universes. For example, when he teams up with Superman, we get to see how their different moral compasses and powers play off each other. Another element is the new villains or threats that are created by the crossovers. It adds a fresh perspective to Batman's world.
Another possibility is a scenario where Voldemort decides to expand his reach into the non - magical world and Batman becomes aware of this threat. He would then enter Hogwarts undercover to learn about magic and form an alliance with the Order of the Phoenix. The contrast between Batman's brooding, non - magical detective nature and the magical world would make for an interesting story.
One common theme is the clash of different Arkham versions of characters. For example, when different interpretations of the Joker from various Arkham games meet. It creates interesting dynamics and often leads to intense showdowns.
One common theme is the contrast between their powers and personalities. Superman is all - powerful and has a more optimistic view, while Batman is a normal human with great skills and a darker, more brooding nature. Their interactions based on these differences are often explored.
It could be really exciting. Maybe they team up to fight a common villain like the Joker and Green Goblin who have formed an alliance. They would bring their unique skills together. Batman with his detective skills and gadgets, and Spiderman with his superhuman strength and web - slinging ability.
One common element is the clash of different worlds. For example, when Batman crosses over with a character from a different universe like Spider - Man, their two very distinct cities (Gotham and New York) and the cultures within them collide. Another is the adaptation of Batman's skills. In a crossover with a magical character like Doctor Strange, Batman has to figure out how to use his detective and combat skills in a world full of magic. And of course, there's the exploration of new relationships. When he crosses over with Superman, for instance, their different views on justice and heroism are explored.