The plot mainly revolves around Batman's encounters with Scarecrow. Scarecrow uses his fear toxins to spread chaos in Arkham. Batman has to face his own fears while trying to stop Scarecrow from causing more harm to the city.
For Scarecrow's character description, start with his physical presence. He moves in a jerky, almost inhuman way, like a puppet on strings. His hands are bony and claw - like. His eyes, which can be glimpsed through the holes in the sack, are filled with a manic glint. In terms of his character, he's obsessed with fear. He sees it as a tool, a weapon, and a form of art. He has no qualms about using it on anyone, whether they're a criminal or an innocent.
One idea could be exploring Scarecrow's backstory in more depth. Maybe show his early days in Arkham Asylum, how he was treated by the staff and inmates, and what led him to become the terrifying Scarecrow. Another plot could involve Scarecrow creating a new and more powerful fear toxin that not only affects Batman but also the citizens of Gotham, and Batman has to race against time to find an antidote while dealing with his own fears.
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.
A 'batman assault fanfic' might be about Batman in a situation where he's up against a formidable foe that has the upper hand in an assault. It could be set in an alternate Gotham where new rules apply. The fanfic might focus on the details of the assault, like the tactics the enemy uses against Batman. It could also explore Batman's internal thoughts during the assault. Is he devising a plan? Is he feeling a sense of doubt? And how does he ultimately overcome or deal with this assault situation? These are all aspects that such a fanfic could potentially cover.
One of the best is 'Batman: The Long Halloween'. It features Scarecrow among other iconic Batman villains. The story is a noir - style mystery that unfolds over the course of a year, with holidays as a backdrop. It delves deep into the criminal underworld of Gotham and shows how Scarecrow fits into that dark tapestry.
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.
'Batman: No Man's Land' is also a great pick. The story takes place in a Gotham that has been cut off from the rest of the world. Scarecrow thrives in this lawless and desolate environment. It gives a different perspective on his character as he takes advantage of the fear and despair around him.