The Lovers: They are a young man and woman about to kiss, but forever frozen in time.

The Piper (Flute Player): A young musician is playing a pipe (flute) under a tree.

The Trees: Not people, but treated almost like characters, forever in bloom.

The Priest and Sacrificial Crowd: A group of people leading a heifer (young cow) to be sacrificed, with a priest in front.

The Speaker (Narrator / Observer): The poet himself, observing and speaking to the urn.