The Man: The protagonist of the story, an ordinary man who finds a mysterious key.
The Little People: A race of tiny beings who live at the top of a tree and possess the knowledge to use the key.
The King of the Little People: The leader of the Little People, who decides to give the key to the man based on a test of character.
The Old Man: A wise figure who gives advice to the man when he first finds the key, urging him to keep it a secret from his wife.
The Man's Wife: The main character's spouse, portrayed as somewhat curious and materialistic, wanting her husband to unlock riches with the key.
These characters drive the events of the story, exploring themes of curiosity, responsibility, and the consequences of one's decisions.