Some Gotham fanfictions might take a different turn and be set in an alternate universe. In this kind of story, the characters could have different personalities or occupations. For instance, Bruce Wayne could be a detective instead of Batman, and the whole dynamic of Gotham would be changed accordingly.
Some 'Batman Gotham fanfiction' focuses on the backstories of the villains. For instance, a story that delves deep into the Penguin's childhood and how he became the criminal he is. It could show his early struggles, the events that led him to embrace a life of crime in Gotham, and how Batman's presence in the city affects his actions and decisions.
Some Gotham OC fanfictions focus on an OC who is a journalist. They are trying to uncover the truth about the corruption and the masked vigilantes in Gotham. Their journey can involve getting into dangerous situations, making allies with some of the good - natured characters in the city, and constantly being in a race against time to break the big story.
There are fanfictions that focus on alternate universes. In a Gotham Batman fanfiction set in an alternate universe, Gotham could be a utopia instead of a crime - ridden city. Batman might have a different role, perhaps as a mentor to a new generation of heroes. This type of fanfiction allows for creative exploration of the characters and the world they inhabit.
One interesting story in Gotham Stories could be about the rise of an underdog vigilante. This character might start from a very humble background and then, through a series of events, decides to take on the criminals in Gotham. They might face many challenges like not being accepted by the police at first and having to deal with powerful criminal gangs on their own.
One interesting Gotham origin story is that of the Wayne family. Their wealth and influence played a big part in shaping Gotham. Thomas Wayne, Bruce's father, was a respected doctor and philanthropist, trying to clean up the city. Another could be the origin of the criminal underworld in Gotham, which might have started with small-time gangs gradually growing into the large and complex criminal network we see in the Batman stories.
One interesting Young Justice Gotham City fanfiction could be about the team having to deal with a new villain that specifically targets Gotham's historical landmarks. This would bring in elements of Gotham's rich history and the unique skills of the Young Justice members.
One interesting storyline could be about a new student at Gotham High who discovers a secret society within the school that has ties to the city's criminal underworld. This new student then has to decide whether to expose the society or get involved with it.
One idea could be exploring the backstories of the Gotham Knights more in - depth. For example, you could write about how they trained before becoming the Knights. Another idea is to create new villains for them to face. Maybe a villain with the power to manipulate technology in Gotham. Also, a fanfiction could focus on the relationships between the Knights, like how they handle disagreements within the team.
There are many. For example, the tales of Batman's early days in Gotham City are quite interesting. His first encounters with the Joker and how he started to build his reputation as the Dark Knight.
A great plot for Gotham Academy fanfiction could be a story centered around a school competition that turns out to be rigged. The main characters suspect foul play and start their own investigation. Or perhaps a story where a character from a villain's family enrolls at the academy and has to deal with the prejudice from other students while also trying to prove they're not like their family. Also, a plot about a haunted dormitory at Gotham Academy would be really cool. The students would have to figure out the mystery behind the hauntings.