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.
There could be a librarian or an old scholar who has some connection to the secret book. They might be trying to protect it or unlock its secrets. And perhaps there's also a villain who wants to use the book for evil purposes, like a power - hungry sorcerer or a greedy thief.
As we have no prior knowledge of this story, it's hard to tell. It might have a protagonist who is on a journey to find the secret book. There could also be an antagonist who wants to use the book for evil purposes. And perhaps there are some side characters like friends or family members of the protagonist who play important roles in the story.
It's hard to say without reading it, but they might be adventurers seeking the secrets in the book.
I don't know as I haven't read it. But they could be kings, queens, or perhaps scholars who are interested in the secret book.
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.