One common theme is Scarecrow's fear toxins and how they affect different characters in the Batman universe. For example, seeing how Batman overcomes his worst fears induced by the toxin.
You can try fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Batman Animated Series Scarecrow' on their search bars and you'll likely find a variety of fanfictions.
One great fanfiction could be about Catwoman's origin story within the animated series' universe. Maybe she starts as a small - time thief in Gotham's slums and gradually rises to become the iconic cat burglar we know. She could have a complex relationship with Batman that is explored more deeply, like her internal struggle between her feelings for him and her life of crime.
One idea could be a fanfiction where Poison Ivy teams up with another villain, like the Joker. They could have a really strange alliance. Maybe she uses her plant powers to help him with one of his crazy schemes, but in the end, she double - crosses him because she realizes his plans are too chaotic even for her. It would be an interesting exploration of her character and how she interacts with other villains in the Batman universe.
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 interesting concept could be exploring Batman's early days as a vigilante in fanfiction. Writers might show his struggles with learning to fight crime effectively while also dealing with his own inner demons.
Most of them are. They are based on the animated series which is generally family - friendly. However, some might have a bit of darker themes as Batman often deals with villains, but overall, they can be enjoyed by kids who are fans of the character.
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.