There is Conrad, for one. He's a key character in the King's Man story.
The main characters include Conrad, who is quite brave and determined. Then there are the more experienced agents in the organization who guide and train him. There's also the villain who is constantly trying to undermine the efforts of the King's Man agency. Each character plays an important role in driving the story forward.
I'm not entirely sure as I haven't studied it in great detail, but there are likely to be some brave spies and a leader who guides them in 'the king's man story'.
The main characters are the old man and the king, of course.
Obviously, the king and the poor man are the main characters. The king is from a high - ranking position with all the power and luxury, while the poor man is at the opposite end of the social spectrum, facing hardships.
The main character is King. But other characters from the One Punch Man universe may also make appearances, like Saitama who is often associated with King due to the misunderstandings regarding King's 'heroic deeds' which are actually Saitama's most of the time.
I'm not sure specifically as I haven't read the exact 'every man a king novel'. But generally, there could be a protagonist who embodies the idea of the everyman rising to a 'kingly' status. There might also be characters who oppose this concept and act as antagonists, representing the status quo or those who don't believe in such equality.
In 'the king's bride story', the king and his bride are central. But we can't forget about other possible characters. The king's guards might be important as they protect the king and the bride. If the story is set in a larger kingdom, there could be regional lords who have different reactions to the king's new bride. There could also be a priest or religious figure if the marriage has a religious ceremony. And the story might introduce a character like a jester or a minstrel who provides some comic relief or a different view on the events related to the king and his bride.
In a possible 'the king's wardrobe story', the king would be the central character. Then there could be his royal tailor, who is in charge of creating and maintaining the clothes in the wardrobe. Additionally, there might be a curious courtier who is always interested in the king's fashion choices and tries to get a peek into the wardrobe. There could also be a thief who attempts to steal from the wardrobe, making him an important character in the story.
As I don't know the specific 'little king's story', it could be the little king himself as the main character. Maybe there are his loyal servants or advisers too.
Most likely, the king is one of the main characters since it's his drum. There could also be a character who is either in charge of the drum, like a drummer or a keeper. And perhaps a character who gets into trouble regarding the drum, like a curious commoner or a mischievous courtier.
The main characters are King George VI and Lionel Logue.