What is a primary characteristic of narrative poetry?

Narrative poetry is a form of poetry that tells a story, often making the voices of a narrator and characters as well; the entire story is usually written in metered verse. Narrative poems do not have to follow rhythmic patterns. The poems that make up this genre may be short or long, and the story it relates to may be complex. It is normally dramatic, with objectives, diverse characters, and metre. Narrative poems include epics, ballads, idylls, and lays.