The main characters in the Atlantis story are, first of all, Poseidon. He was deeply involved as he not only founded Atlantis but also had a significant influence on its development. His descendants, like Atlas, played important roles as rulers. The Atlanteans, the people of this fabled land, were a complex group. They were prosperous and technologically advanced. There were probably wise men and warriors among them. And in the context of how we know the story, Plato and the Greeks he was communicating with can also be considered characters in a sense. Because it was through Plato's writing and the Greeks' reception of this story that it has been passed down to us. So, in a way, they are part of the meta - narrative of the Atlantis story.
Ted Brautigan is an important character as well. He has a mysterious quality about him and forms a special bond with Bobby. His presence in Bobby's life has a significant impact on Bobby's understanding of the world and himself.
In the 'Man from Atlantis' novel, if it follows the common tropes, the man from Atlantis is bound to be an interesting character. He would carry the mystery and allure of his origin. There might be characters around him such as a female lead who is both fascinated and sympathetic towards him. And perhaps there are antagonists, maybe from a secret organization, who are eager to extract the secrets of Atlantis from him by any means necessary. There could also be an old wise man who helps the man from Atlantis understand the modern world better.
Most likely, Captain Atlantis is the central character. Besides him, there could be an antagonist, someone who opposes him and his goals. And perhaps there are some wise elders or magical beings that play important roles in the story as well. They could either guide Captain Atlantis or present challenges to him.
Well, without reading the 'the lost city of atlantis short story' in detail, it's hard to say for sure. However, it's common to have a protagonist who is either a curious adventurer or a person with a personal connection to the legend of Atlantis. For example, they might be descended from the people of Atlantis. There could also be antagonists, perhaps people who don't want the truth about Atlantis to be discovered for their own selfish reasons.
There could be a wise old wizard or witch who acts as a mentor to the heir of Atlantis. This character would have knowledge about Atlantis and its secrets, and would guide the heir in understanding their heritage and powers. Another possible main character could be a villain who is trying to stop the heir from fulfilling their destiny, perhaps because they want to claim the power of Atlantis for themselves.
Obviously, Harry Potter would be one of the main characters. And there would probably be some Atlantian characters like the King or Queen of Atlantis, or other important Atlantian figures. Maybe some of Harry's friends from Hogwarts could also be involved, like Hermione and Ron, if they also get dragged into the Atlantis adventure.
In 'dc superhero girls legends of atlantis story', the main characters are surely the DC Superhero Girls. Wonder Woman, with her strength and wisdom from the Amazonian heritage, would play a key role. Supergirl, with her superhuman powers, could be crucial in any battles. Batgirl, with her detective skills, might be the one to uncover secrets in Atlantis. There could also be other characters like Bumblebee or Poison Ivy, each bringing their own unique abilities to the story.