Since I don't know the details of this story, it's hard to say. It could be pilots, aircrew members if it has something to do with a plane - related event on the tarmac. Or it could be spies if it's a story about espionage and the tarmac is the location for a secret exchange.
I'm not sure specifically which 'secret on the tarmac story' you are referring to. There could be many stories with such a title. It might be about some hidden event or mystery that takes place on a tarmac, like a secret meeting between important people, or something being smuggled on the tarmac without others' knowledge.
Given the lack of context regarding the 'bastos secret secret story', we can only speculate about the main characters. If Bastos is a person, perhaps they are the central figure, and there could be friends, family members, or foes around them that are part of the story. Maybe there are also some mysterious figures that help or hinder Bastos in the discovery or protection of the secrets in the story.
There could be a protagonist who is a young and curious person trying to uncover the secrets of the society. There might also be an antagonist, perhaps an elder in the society who is very protective of its secrets and will do anything to keep them hidden. Other characters could include the members who are loyal to the cause of the society and those who are on the fence about its activities.
Since we don't have more information about the book, the main characters could be anyone from different walks of life. It could be a journalist who is trying to dig out the secret, or it could be a person who has lived with the secret all their life and now the story is about their experiences related to it. There could also be other supporting characters who play a role in either protecting or uncovering the secret.
Since I don't know the specific'secret class story', it could be students who are curious and adventurous. They might be the ones who discover the secret class or are part of it from the start.
The main characters in the 'Secret Seven Story' are, of course, the seven kids that make up the Secret Seven. There's Peter, who is likely the leader or one of the main leaders in the group. He's brave and often comes up with plans. Then there are other members like Janet, who might be good at supporting the group in different ways, maybe by providing moral support or helping with the details of their investigations. There are also other kids in the group, all with their unique traits that contribute to the group's ability to solve mysteries.
I don't know for sure, as I'm not familiar with this story. It could be a young adventurer who discovers the secret book.
Since I don't know the exact 'the secret message story', it's hard to say. But usually, there would be a person who discovers the message. There might also be a helper, like a wise old man or a clever friend who assists in understanding the message.
There might be a young fairy who is on a quest to discover the secrets, and she could be one of the main characters. Also, there could be an antagonist, perhaps another fairy who wants to keep the secrets hidden at all costs. There could also be some human characters if the story involves the interaction between the fairy world and the human world.
There could be a curious child as one of the main characters. This child is always exploring and it's their inquisitiveness that leads them to the secret door.