Without having read 'the secret chamber story', it's hard to say. However, typical characters in such a story could include a curious protagonist, perhaps a young person with a thirst for discovery. There might also be an antagonist, someone who wants to keep the secrets of the chamber hidden. And there could be side characters like an old caretaker who knows a bit about the chamber's history.
As I'm not familiar with 'the secret chamber story', the main characters could be a diverse group. Maybe there's a brave explorer who leads the way into the secret chamber. There could be a scientist or an archaeologist interested in the historical or scientific value of the chamber. And there might be local people who have heard legends about the chamber and either help or hinder the main characters' exploration.
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.
The main characters are the young bride and the marquis. The bride is a young, innocent girl who enters into a marriage with the marquis, not fully aware of what she's getting into.
The main character is the young bride. She is the central figure around whom the events of the story revolve. She is innocent at the start and has to face a lot of difficulties.
The main characters in the 'Bloody Chamber Full Story' might include a young woman who is the central figure in the eponymous 'bloody chamber' story. There could be an older, more powerful male figure, perhaps a nobleman or a magician - like character who holds sway over her. There may also be secondary characters like servants or friends of the protagonist who play important roles in either helping or hindering her in the face of the mystery and danger.
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.