Family members or friends of the Young Justice members could be main characters too. They would be dealing with the grief and might be involved in trying to find out the truth or get justice. Their emotional journey could be a big part of the story, and they could interact with the other characters in different ways, like pushing the heroes to act or providing support in unexpected ways.
Obviously, the main characters from Young Justice like Robin, Aqualad, and Kid Flash would be there. They are the core of the group and their personalities would create a lot of interesting situations in high school.
The main characters would most likely be the core members of the Young Justice team, like Robin, Superboy, and Miss Martian. They are the central figures in the original Young Justice series, so it's natural for them to be the main characters in this fanfiction as well.
The main characters from Young Justice like Robin (Dick Grayson), Aqualad, and Superboy are likely to be there. And of course, the Robin Brothers which could include different versions of Robin such as Jason Todd and Tim Drake.
The main characters might interact with historical superheroes or villains that no longer exist in their present time. For instance, they could meet an ancient sorcerer - villain who was sealed away long ago. Dealing with such a character would test their skills and force them to think outside the box in terms of combat and strategy.
Obviously, Robin would be the central character. He's the one who is misplaced. Then there would probably be the other members of the Young Justice team like Aqualad, Kid Flash, and Superboy. They would be searching for Robin or perhaps be unknowingly involved in the events that led to his misplacement.
Obviously, Batman is a key character. He's the mentor, the one with all the experience and skills to pass on. Then there's Robin, who has a special connection to Batman and can act as a sort of bridge between the Dark Knight and the rest of Young Justice. Superboy would also be important. His super - strength and sometimes - unruly nature would provide an interesting dynamic for Batman to work with.
Obviously, the young justice members themselves will be there. And then, of course, Batman is very likely to show up. He is Gotham's main protector after all.
Artemis could be involved as well. Her skills as an archer and her family's complex history could lead to some interesting time - travel scenarios. For example, she could travel back in time to discover secrets about her family's past that have an impact on her present - day self and the Young Justice team.
It varies a lot. Sometimes it's the core team members like Dick Grayson or Wally West. Other times, it could be less prominent characters getting more focus in the fanfic.
Obviously, the Flash is one of the main characters. He brings his super - speed and unique personality to the story. And then, of course, members of the Justice League like Superman, Batman, Wonder Woman, etc. Superman with his super strength, Batman with his intelligence and gadgets, and Wonder Woman with her combat skills and Amazonian heritage are all likely to play important roles.