There could be the good prince himself. And perhaps there are his loyal servants, a wise old advisor, and the common people in his kingdom.
Well, the main character is of course the good prince. Alongside him, there may be a cast of characters. There could be the poor peasants who look up to him for help and protection. There might be a beautiful princess from another land who he falls in love with, and this relationship could also be part of his story. Additionally, there could be corrupt nobles who try to undermine his good works, and he has to deal with them cleverly to continue his mission of doing good in the kingdom.
In 'the good prince story', we might expect to find the prince as the central character. He could be surrounded by other important characters such as his family members, like his father the king or his mother the queen. There could also be knights who serve him, and villains who oppose his good deeds. Maybe there are also some magical creatures if it has a touch of fantasy, like a friendly fairy who guides the prince on his journey to do good.
A wise old mentor would be great. He could be an ex - knight or a scholar who has seen a lot in his life and can guide the prince. Also, a loyal servant who has been with the prince since he was a child and is like a family to him. And a female warrior who is initially skeptical of the prince but later becomes his ally and maybe even love interest.
The sad prince is the central figure in the story. There could be other characters such as the poor citizens in his kingdom. They are important as they are the ones whose suffering the prince witnesses. Maybe there is also a messenger or a court jester who adds some color to the story and helps to show different aspects of the prince's character through their interactions.
Most likely, the prince is one of the main characters. There might also be a female lead, perhaps a commoner or a princess from another kingdom.
The pilot is an important character too. He is the one who meets the Little Prince in the desert and listens to his story. There are also the various characters on the different planets that the Little Prince visits, like the king, the conceited man, the tippler, the businessman, the lamplighter, and the geographer. Each of them represents different aspects of the adult world's follies.
The Little Prince is the main character, of course. He is a small boy from a tiny planet.
There are the prince, the goose girl (who is actually a princess), and the maid who took the princess's place.
The main character is Edward, the Black Prince himself. He was a central figure in the story due to his military exploits.
In the original Frog Prince story, the primary characters are the princess, a young and perhaps a bit spoiled girl who loves her golden ball. Then there's the frog, an unusual character that can talk and strikes a deal with the princess. And we have the king, the princess's father. He plays an important role in making sure the princess keeps her word to the frog, which ultimately leads to the frog's transformation into a prince.
There must be the prince himself. And probably his family members like his parents and siblings.
There might be some advisers or counselors to the prince. They play important roles as they offer advice to the prince, which can either lead him to success or failure. And there could also be some rival characters, like other princes or powerful lords who oppose the main prince.