In a more extreme scenario, Deadpool could end up in Arkham Asylum and think it's a new kind of S.H.I.E.L.D. facility. He'd start interacting with the inmates there, and Batman would have to step in to deal with the chaos Deadpool is causing. Deadpool would see Batman as this dark and brooding figure and keep trying to get him to lighten up.
One possible plot could be that Deadpool is hired by a mysterious villain to steal something from Batman. But when Deadpool realizes it's Batman he's up against, he decides to have some fun with it instead of just doing the job. He starts leaving crazy clues and taunting Batman in his own wacky way. Batman, of course, is initially frustrated but then starts to figure out Deadpool's pattern and tries to use it against him. In the end, they might end up having to team up to stop the real bad guy who hired Deadpool in the first place.
One possible plot could be that Deadpool is somehow teleported to Gotham City. He starts causing chaos in his usual wacky way, which catches Batman's attention. Batman initially mistakes him for just another criminal but soon realizes Deadpool's unique nature. They could end up teaming up to take on a common enemy, like a new super - villain who has a plan to destroy both Gotham and Deadpool's world.
Ra's al Ghul could also be a main antagonist. He might see Deadpool as a wildcard that could disrupt his plans for Gotham and the world. Ra's al Ghul's long - term goals of achieving immortality and controlling the world would put him at odds with both Batman and Deadpool. Deadpool's immortality might be something Ra's al Ghul wants to study or use for his own purposes, and Batman would do anything to stop Ra's al Ghul's evil schemes.
The Joker would be really interesting. Imagine Deadpool meeting the Joker. Deadpool would be both fascinated and repelled by the Joker's insanity. The Joker, on the other hand, would be intrigued by Deadpool's indestructibility and chaotic nature. It would create a really wild dynamic, with Batman caught in the middle trying to stop both of them from causing too much mayhem.
In a 'deadpool meets batman fanfiction', there could be a lot of chaos. Deadpool's wild and unpredictable nature would clash with Batman's brooding and serious demeanor. Maybe Deadpool would constantly crack jokes and annoy Batman. He might also try to get Batman to lighten up and break some of his strict rules.
Well, one possibility could be Deadpool driving the Avengers crazy with his non - stop chatter and crazy antics. He might constantly break the fourth wall in the middle of a mission, making the Avengers wonder what on earth he's talking about. For example, he could start making jokes about how Captain America's suit is so old - fashioned compared to his own while they're in the middle of a fight against a powerful villain.
One great 'deadpool crossover fanfiction' is the one where he crosses over with Spider - Man. It's really interesting to see how Deadpool's chaotic nature interacts with Spider - Man's sense of responsibility.
First, understand the characters well. For Deadpool, his sense of humor, his fourth - wall - breaking nature are key. Then, think of a unique crossover. Maybe Deadpool in a world full of fairytale characters. Also, keep the plot moving and full of surprises.
It depends on the situation. If it's in Gotham, Batman has the home - field advantage. He knows the city like the back of his hand and has all his gadgets and traps set up. But Deadpool is really hard to kill. He could keep coming back at Batman no matter how many times he's knocked down. So it could be a never - ending fight with no real winner.