One interesting fanfiction could be about Scarecrow's origin in the 'Batman Begins' universe. It might explore his early experiments with fear toxins in more detail than the movie did.
Fear is the most common theme. Since Scarecrow is all about inducing fear, it's often central in these fanfictions. Writers explore how Batman overcomes or is affected by the extreme fear that Scarecrow creates.
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.
One popular theme is the exploration of fear. Since Scarecrow is the master of fear, fanfictions often delve deep into how different characters, especially Batman, experience and overcome fear. Another theme is the battle of wits. Batman is a brilliant detective and Scarecrow is a cunning adversary, so their mental duels are a big draw.
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.
Definitely 'Batman: Year One'. Although Scarecrow doesn't have a huge role, his cameo and the implications of his existence in Gotham at that time are interesting. It sets the stage for future encounters. Also, 'Scarecrow: Year One' which focuses specifically on his origin story. It shows how he became the master of fear that he is in the Batman universe.
One of the best Scarecrow stories is 'The Long Halloween'. In it, Scarecrow adds to the overall sense of dread and mystery in Gotham. His fear toxin is used to great effect, making it a great read for Batman fans.
Not exactly. Batman Begins is one interpretation of Batman's origin story, but it's not the definitive or only 'real' one. Different Batman stories and adaptations offer various takes.
One common theme is the psychological battle between Batman and Scarecrow. Since Scarecrow is all about fear, fanfictions often explore how he uses fear against Batman in a more personal or intimate way in a slash context.