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.
Obviously, the members of the Justice League like Superman, Batman, Wonder Woman, The Flash, Green Lantern etc. would be main characters. And in Gotham, we can't forget the villains such as the Joker, Penguin, and Catwoman. They are likely to play important roles as well.
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.
In this fanfiction, the young justice team might encounter Gotham's unique villains. They could face challenges like dealing with the Joker's unpredictable madness or Penguin's devious schemes.
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.
In this fanfiction, the Justice League might face Gotham's unique villains. Maybe they'll team up with Batman in new ways. For example, Superman could use his powers to assist in stopping a large - scale Arkham Asylum breakout that the local Gotham police can't handle on their own.
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, 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.
Well, Naruto is a given. Then there could be other minor gods or spirits in Kami's realm that Naruto meets. Maybe there's a guardian spirit of the ninja world that only appears when someone tries to reach Kami. Also, characters like Kakashi could be involved. He might have some knowledge about Kami that he imparts to Naruto before the journey, or he could even end up joining Naruto on his adventure to Kami.
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.