I'm sorry, I don't know who the main characters are as I haven't read the story.
Since we don't have information about the story, it's impossible to say for sure. But in a typical short story about a magic secret, there could be a young hero or heroine who discovers the secret. There might also be an antagonist, someone who wants to use the secret for bad purposes, like a dark wizard or a greedy person.
Not having read 'the magic secret short story', we can only hypothesize. There could be a wise old mentor figure who knows about the magic secret and guides the protagonist. Maybe there's a group of friends who together uncover the secret. It could also be that the main character is an ordinary person who stumbles upon the magic secret and is then thrust into an extraordinary adventure.
Since we don't have more information about 'the magic short story', it's hard to say exactly. But it might have a protagonist who is on a quest for something. This could be a physical object like a magic key or an intangible thing like knowledge. There could also be a sidekick character who helps the main character along the way, whether it's a talking animal or another person with special abilities.
Since I haven't read it, I can't say for sure. But it could be a young detective trying to solve the mystery of the secret message, or perhaps an ordinary person who gets caught up in the intrigue because they found the message.
In a 'secret killer short story', there might be a protagonist who could be a journalist or a private investigator. They would be driven by curiosity or a sense of justice to find out who the secret killer is. There could also be the victims, who may have some connection that the killer targets. And of course, the secret killer themselves, who would be a character with a hidden identity, perhaps living a double life, seeming normal in public but having a murderous side in private.
I don't have enough information about 'the secret kite short story' to tell you the main characters. But typically in a short story, there could be a protagonist, perhaps a child or an adult who is intrigued by the secret kite. There might also be some supporting characters like an old man who gives some hints about the kite's history or a friend who helps in the search for the secret.
Since I don't know the story, I can't say for sure who the main characters are. But they could be scientists who are studying the grass, or perhaps children who discover something unusual about the grass in their backyard.
The two main characters are the narrator, who is the captain of the ship, and Leggatt. Leggatt is the secret sharer who has escaped from another ship and is being hidden by the narrator on his ship.
In 'the secret woman short story', the central figure is the woman with the secret. She could be surrounded by a cast of characters. There might be a male lead who is in love with her but is unaware of her secret. There could also be a nosy neighbor or a co - worker who starts to suspect something is off and begins to dig deeper into her affairs, adding to the tension and drama of the story.
Mary Lennox is a main character. She is a young girl who is sent to live at Misselthwaite Manor after her parents die. She is initially a difficult and lonely child but changes throughout the story. Colin Craven is another important character. He is a sickly boy who has been told he will die young. And Dickon is also a main character. He has a special connection with nature and befriends Mary and helps with the secret garden.
Typically, there is a young girl as one of the main characters. She is often the one who discovers the secret garden and plays a key role in its revival.
It's possible that an old man is the main character. Maybe he has been alone for a long time and the goldfish becomes his only companion. And through the relationship with the goldfish, he learns some important life lessons.