Final answer:
The narrator describes the lords of Carrión as initially suitable but ultimately reveals their cowardly and dishonorable natures.
Step-by-step explanation:
The narrator of The Song of the Cid provides insight into the characters of the lords of Carrión who marry El Cid's daughters. The Carrión lords, in the context of the epic poem, are portrayed initially as suitable noblemen who gain favor with El Cid. However, as the poem progresses, their true cowardly and dishonorable natures are revealed, casting them in a negative light. They ultimately betray El Cid's trust by mistreating his daughters, which results in the loss of their honor and standing.