Since I don't know the exact novel, it's hard to say. But it's likely to have the billionaire playboy as a main character, and maybe his love interests, business partners, or friends.
The main character is most likely the billionaire playboy. He could be surrounded by a cast of characters. For example, his family members like a demanding father who wants him to be more responsible with the family business. There might be a group of his friends who are also from wealthy backgrounds and engage in similar playboy lifestyles, which either encourage or discourage his behavior. And then there could be a journalist or a detective - like character who is trying to expose some secrets about his playboy life or business affairs.
In the 'billionaire boy story', the central character is the boy who has billions. He might be surrounded by other characters like business partners, if he's involved in business at a young age. There could also be a rival, perhaps another wealthy kid or a jealous adult who wants to take his wealth away. His teachers or tutors could also be part of the story, especially if they are involved in his education which is likely influenced by his wealthy status.
I'm not sure specifically as there could be many novels with such a title. It might be about the adventures and lifestyle of a billionaire who is a playboy, perhaps his relationships, business dealings in a rather flamboyant and carefree context.
The main characters would surely be the billionaire's twins. Since they are the ones playing matchmaker, they are central to the story. Then there could be the characters they are matchmaking for. Maybe there's a young couple, one from a poor background and the other from a wealthy but snobbish family. And the billionaire parent could be a character who either supports or opposes the twins' matchmaking efforts, adding more drama to the story.
If it's a fictional 'Play Boy Story', the main character could be a young, wealthy man who enjoys the high life. He might have friends who are also part of his playboy lifestyle, so they could be main characters too. They could be into things like fast cars, exclusive clubs, and dating beautiful women.
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.
The main characters in a 'love of a billionaire novel' usually include the billionaire. He could be a playboy type who has been through many relationships but never truly fallen in love until he meets the right person. The female lead could be a strong - willed woman, perhaps an artist or a writer, who is not easily impressed by his wealth. Their different personalities and life goals create an interesting dynamic. There might also be secondary characters like the billionaire's business associates or the woman's friends who play roles in either helping or hindering their relationship.
In many'secret billionaire novels', the main character is, of course, the secret billionaire. This person could be male or female. They are often portrayed as complex individuals, with their own insecurities despite their vast wealth. There could be a sidekick or a loyal friend who is aware of the secret and helps the billionaire manage their double life. Another important character could be a family member, perhaps a parent or a sibling, whose relationship with the billionaire is affected by the secret. And then there are the characters who are on the outside looking in, like nosy neighbors or journalists who suspect something is up and try to uncover the billionaire's secret.
Obviously, one of the main characters is the 'beauty' and the other is the 'billionaire'. But without reading the novel, we can't know their specific names or more detailed characteristics.
Since I don't know the specific 'bogus billionaire novel', I can't say for sure. But it could have the bogus billionaire as a main character, of course. There might also be a love interest who is either deceived by or discovers the truth about the false billionaire.
I'm not sure exactly as I haven't read the novel, but likely there is the billionaire as a main character. There might also be a protagonist who has some sort of connection to the billionaire, like an employee or a person who unexpectedly enters the billionaire's world.