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.
I'm not familiar with this story, so I can only guess. There might be a brave adventurer as a main character who is determined to uncover the secret of the Nile. There could also be a wise old man or woman who holds some crucial knowledge about the Nile's secret. And perhaps there are some antagonists, like thieves or rival explorers who want to get to the secret first.
I'm not entirely sure without reading the novel, but there must be a detective or someone investigating the death. There could also be the victim, of course. And perhaps some suspects like the people who were on the boat or near the scene of the death on the Nile at the time.
I'm not sure specifically as I haven't read this 'Secret of the Nile Story'. It could be about some mystery or adventure related to the Nile River, like perhaps a hidden treasure along the Nile, or a secret society that has its roots there.
In the 'Death on the Nile Graphic Novel', there should be the victim whose death sets off the mystery. And of course, Hercule Poirot, the brilliant detective. There may also be a group of suspects, like the passengers on the Nile cruise who all have their own motives and secrets.
I don't know for sure as I haven't read the novel. But they could be people who have lived near the Nile for generations and have some important role to play in the story.
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 include Hercule Poirot who uses his sharp intellect to unravel the mystery. Linnet Ridgeway, the rich and glamorous target. Jacqueline de Bellefort, whose jealousy and actions drive much of the plot, and Simon Doyle, whose relationship with the other characters sets the stage for the deadly events in the novel.
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.