A smart and curious student could be a main character. This student might be the first to notice something strange going on and then team up with Batman. For example, a science - geek student who notices some abnormal chemical reactions in the school lab that might be related to the mystery Batman is investigating.
A popular jock in the high school could be a main character. He might start off as a bit of a troublemaker or a skeptic of Batman's presence. But as the story progresses, he could be influenced by Batman and become a more positive force in the school, helping Batman in unexpected ways, like using his popularity to gather information from other students.
Commissioner Gordon would likely be a main character. He has been Batman's ally for a long time, and with Batman retiring, he'd have to face the challenges of keeping Gotham safe on his own. Also, Robin, if there is a current Robin in the story, could be a main character. He might be left with the big shoes to fill that Batman has left behind.
Well, maybe Batman is there to give a talk on crime prevention. He could inspire the students to stand up against bullies, which is like a form of small - scale crime in high school.
The Penguin often makes an appearance. He can add an extra layer of chaos and villainy to the story. His devious plans can either get in the way of Batman and Catwoman's relationship or be a catalyst for them to work together more closely.
The Joker is an obvious choice. His relationship with Harley Quinn is complex and his chaotic nature can add a lot of drama to the fanfiction. Also, Poison Ivy could be included. She has a strong friendship with Harley, and her plant - based powers can create interesting scenarios when combined with Batman's detective skills.
Oracle is a great character to include. She can provide the technological support and intel that both Red Hood and Batman need. Her relationship with Batman also adds an interesting dynamic.
Well, obviously the two main characters are Batman from the normal DC universe and Flashpoint Batman. Batman is the well - known Dark Knight, a symbol of justice in Gotham. Flashpoint Batman is from an alternate timeline, with different experiences and a potentially different personality.
Well, their relationship in high school fanfiction could be really complex. Maybe Batman is the straight - A student who is always focused on justice and order, while Catwoman is the rebellious type. She might be drawn to Batman's sense of right and wrong, but also want to challenge it. They could have secret meetings on the rooftop of the school, sharing their different views on life and society. And perhaps there's a bit of a love - hate thing going on, where they fight but also have a deep, unspoken connection.
Harley Quinn could be a great addition. She has a complex relationship with both Poison Ivy and Batman. Her chaotic nature could add a lot of twists to the story. Another character could be Alfred. His wisdom and loyalty to Batman could provide interesting interactions when dealing with Ivy.
Another character could be Terry's love interest. She could play a role in the twins' story, perhaps she has a connection to their past or she gets caught in the middle of their conflict with Batman Beyond, making the story more complex and engaging.
The Joker could be a great main villain. He could infiltrate the school disguised as a new student or a janitor. He starts causing chaos by spreading his brand of insanity among the students, like setting up pranks that turn dangerous. Batman would immediately recognize his presence, but the Joker is always one step ahead in causing mayhem. Wonder Woman would have to use her lasso of truth to try and get information from the students who have been influenced by the Joker.