He could be in shock at first, but then his detective skills would kick in. Batman would analyze how Scarecrow found out and who else might know. He might start making plans to protect his family and friends, like moving them to a safe location. And he would likely come up with a new strategy to continue his fight against crime in Gotham without relying on his secret identity as much.
Batman's reaction would be complex. He has spent years building his identity as both Bruce Wayne and Batman. If it's revealed, he'd feel a sense of vulnerability. However, he's also a very determined character. So, he'd likely double - down on his efforts to protect Gotham. He might start working more closely with his allies in the light of day as Bruce Wayne, using his influence and resources to fight crime in a different way while still trying to keep his Batman persona alive in some form.
Batman would probably first try to contain the situation. He'd use his resources as Bruce Wayne to spread misinformation or counter the revelation. He might also go on the offensive against Scarecrow to stop him from spreading the news further.
In fanfiction, if Scarecrow reveals Batman's identity, it could shatter the public's perception of Bruce Wayne. People might see him as a vigilante who has been deceiving them all along. This could lead to a division in Gotham, with some seeing him as a hero still and others believing he's a menace. Batman's allies, like Commissioner Gordon, would have to decide whether to continue supporting him or distance themselves to protect their own reputations.
Well, Gordon's reaction could be complex. On one hand, he might feel honored that Batman has chosen to disclose his identity to him. On the other hand, he could also be worried about the implications. Knowing Batman's identity means he has a greater responsibility to protect that secret. He might start to think about how this new knowledge will affect their working relationship and the safety of Gotham. For example, if the wrong people find out that he knows Batman's identity, it could put him and his family in danger.
Batman would probably isolate himself at first. He'd retreat to the Batcave to analyze the situation. He might feel a sense of guilt, thinking he should have seen the betrayal coming. After that, he'd start planning his counter - move. He'd use his vast resources and knowledge to expose the truth behind the betrayal and take down whoever is behind it.
Batman might become more brooding. He could withdraw from the people around him, like Robin or Commissioner Gordon.
He might isolate himself from the League at first. Batman is used to working alone, so he could retreat to his Batcave and plan his next move. He could also start to prepare counter - measures in case the situation escalates and the Justice League becomes a threat to him.
It could cause chaos in the underworld. Once the Joker's identity is revealed, his associates might feel betrayed or threatened. Some might try to eliminate him to protect themselves from being exposed as well. Also, other villains in Gotham might see this as an opportunity to take over the Joker's territory or operations, leading to power struggles and more crime and violence.
In some fanfictions, Scarecrow is often depicted as a formidable foe to Batman. His fear toxins play a major role. Batman has to constantly overcome the extreme fears that Scarecrow induces. For example, in certain stories, Scarecrow may target Batman's deepest traumas, like the death of his parents, and use that to try and break him. This creates a very intense dynamic where Batman has to rely on his willpower and detective skills to outwit Scarecrow.
She could be devastated. Wonder Woman might go into a period of mourning, isolating herself from others as she grapples with the loss. She was used to having Batman as an ally, and his death would leave a big hole in her life.
In many Batman graphic novels, Scarecrow starts as a relatively simple fear - mongering villain. For example, in his early appearances, he mainly uses his fear toxin to cause chaos in Gotham. But as the stories progress, like in 'Batman: Arkham Asylum - A Serious House on Serious Earth', his character becomes more complex. He is not just about spreading fear physically but also mentally torturing Batman, showing a deeper understanding of Batman's own fears.
One interesting plotline could be the reaction of Gotham's criminals. They might either be overconfident thinking they can now easily target Batman or be terrified knowing his true identity means he has more resources at his disposal. Another could be how Batman's allies, like Alfred, deal with the new situation. Alfred might be even more protective or start to worry about the safety of Bruce Wayne's loved ones.