There could be a young and curious character, maybe a novice in some sort of magical or historical study. This character is drawn to the mystery of the nagas and sets out on a quest. There might also be a group of protectors, whose job is to keep the secrets of the nagas safe from those who would misuse them.
One of the main themes could be mystery. Nagas often carry an air of mystery in many mythologies, so perhaps the novel explores that mystery. Another might be adventure as the characters might be on a journey to discover the secrets of the nagas.
Well, perhaps one key element could be their habitat. If nagas are associated with water, their underwater lairs or the hidden places they dwell might be part of the secret.
The 'secret of nagas' might be related to their origin, powers, or some hidden knowledge within their culture. In some mythologies, nagas are often associated with water and are said to possess great wisdom and magical abilities. However, without more specific information, it's hard to tell the full story.
The main characters are the seven members of the Secret 7 club.
There might be a female lead who is at the center of the secrets. For example, she could be a woman with a past she is trying to hide, and her actions and relationships are shaped by this need to keep things in secret.
The two main characters in 'Secret Window, Secret Garden' are Mort Rainey and John Shooter. Mort Rainey is a writer living his life when suddenly he is faced with this strange situation. John Shooter, who appears out of nowhere, is the catalyst for all the chaos in Mort's life. Mort is the character we follow through his psychological journey as he tries to figure out what's going on with Shooter's claims. Shooter is the mysterious and somewhat threatening figure that forces Mort to re - evaluate his own work and sanity.
In 'the secret billionaire novel', the main character is surely the secret billionaire. There may be a confidant, someone the billionaire trusts with their secret or at least part of it. There could also be antagonists, like those who are trying to expose the billionaire's secret for their own gain. Additionally, there might be ordinary people with whom the billionaire forms relationships, which are influenced by the hidden wealth.
I don't know the exact main characters as I haven't read the novel. But they could be scientists or adventurers.
Not having read 'the secret stealers a novel', it's tough to name the main characters. However, in a story about stealing secrets, we might expect to find a mastermind behind the secret - stealing operations. This could be a shadowy figure with a complex backstory and motives. Then there would likely be those who are affected by the stolen secrets, like victims or people whose lives are in danger because of the secrets being exposed. And of course, there could be characters who are on a quest to expose the secret stealers and bring them to justice.
I don't know as I haven't read the book. But it could be a family, like a mother, father and their children. Maybe there's also a friendly neighbor or a mysterious stranger who plays a crucial role.