First, think about the type of injury. Is it a physical injury from a fight, like a broken bone or a deep cut? Or could it be a psychological injury, like seeing something traumatic. Then, consider how Batman would react. He's a strong character, so he might try to hide his injury at first. Also, think about how the other characters in the Batman universe would respond.
One great injured Batman fanfiction is 'The Broken Knight'. It shows Batman dealing with a serious injury and how he still tries to protect Gotham. The author does an amazing job of portraying his internal struggle.
It could be that in the fanfiction, Superman has been corrupted in some way. His values have shifted, and he sees Batman as a threat to his new - found ideology. So, he decides to take Batman down, resulting in the injury. This could lead to a complex story of redemption or further conflict.
He could be portrayed as more vulnerable. For example, his usual stoic facade might crack as he endures pain from his injuries. He might be less quick to jump into action and more cautious, which would be a big change from his normal fearless self.
In some fanfictions, Batman might be injured while investigating a dangerous conspiracy. He gets too close to the truth and the people behind it try to eliminate him. They set up traps, like a high - tech booby - trapped building. Batman is caught in an explosion or a collapsing structure, which results in his injury. Then the Justice League has to come to his rescue and deal with the conspiracy.
Perhaps Batman is injured in a trap set by the Joker. While he's injured, the other villains in Arkham Asylum sense his weakness and start planning a mass breakout. Batman has to use his wits and the help of Oracle to stop them from the confines of his Batcave, all while nursing his injuries.
One possibility is that the Justice League would be divided. Some members might side with Superman, believing he had a good reason, while others would stand by Batman. This would create a power struggle within the league.
One possible scenario in such a fanfiction could be that Batman gets injured during a battle with a powerful new villain in the Justice League. Maybe he's trying to protect a civilian and takes a direct hit that leaves him severely wounded. His fellow Justice League members then have to figure out how to continue the fight while also taking care of him.
In many Batman and Robin fanfictions where Robin is injured, it often leads to Batman becoming more determined to catch the villain. For example, in some stories, Robin gets injured during a fight with a new, powerful enemy in Gotham. Batman then uses his detective skills to track down the bad guy while also taking care of Robin. He might call in Alfred for help with Robin's injuries. This kind of situation shows the deep bond between Batman and Robin and how they rely on each other in tough times.
One possible fanfiction could be where Jason Todd is injured during a fight with a new and powerful villain in Gotham. He might be trying to protect civilians and gets caught off - guard, resulting in a serious injury that leaves him physically and mentally shaken.