1. The Smith: The protagonist of the story, a blacksmith known for his skilled craftsmanship and his good nature.
2. St. Peter: The gatekeeper of Hell, responsible for deciding who enters and who is denied access.
3. The Devil: The ruler of Hell, who ultimately determines the fate of those who come to his realm.
4. Various Sinners: The story mentions several sinners who are referenced by St. Peter as examples of those who have been denied entry to Hell. These include a lawyer, a merchant, and a priest.
5. Bystanders: The story briefly mentions a group of bystanders who witness the Smith's interactions with St. Peter and the Devil, observing his efforts to gain entry to Hell.