There's no way to tell without more information about the 'Secret in Slovakia Story'. But it might be that the main characters are adventurers, explorers, or even local people who are somehow involved in the secret - keeping or - uncovering.
Well, without more context, it's difficult to say exactly. It might involve some sort of personal adventure where someone discovers a secret in Slovakia. Maybe it's about a long - lost treasure or a forgotten legend that is finally unearthed in that country.
As there is no information given about this story, it's impossible to say who the main characters are. They could be ordinary people with an extraordinary secret, or they could be fictional characters created for a specific plot.
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.
In 'The Secret in Their Eyes Story', there could be a detective - like character as one of the main characters. This person would be observant and would focus on the eyes of suspects or other people involved in the mystery. There might also be a character who is the keeper of the most important secret. This character would be acting in a way to avoid having their secret discovered through their eyes. And perhaps there is a love interest as well, whose eyes hold a different kind of secret, like a hidden passion or a past relationship.
Since I don't know the details of 'the secret grave story', I can't say for sure who the main characters are. But they could be the people who discover the secret grave, like an archaeologist or a curious local.
The main character is a young hero. There is also a female character who becomes an important ally in the adventure. And there are some wise old men who guide the hero on his journey regarding the secrets of Mana.
Since I don't know the exact 'Secret of the Nile Story', I can't say for sure who the main characters are. But they could be explorers, local people living near the Nile, or maybe even some mythical creatures if it's a fictional and fantastical 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.