In the exposition the plot, background, and characters are introduced.
Most common Archetypal characters in Literature are:
-The Hero
-The Villain
-The Journey
-Doppelganger
-The Innocent Youth
-The Mother Figure
If you need the definitions, go to the website literarydevices
they have good definitions.
The warrior Achilles is one of the great heroes of Greek mythology. According to legend, Achilles was extraordinarily strong, courageous and loyal, but he had one vulnerability–his “Achilles heel.”