Custodian of Time

Custodians of Time are members of the bronze dragonflight, servants of the great Nozdormu (in particular, of the Keepers of Time), found inside the Caverns of Time in Tanaris. They often take the shape of draenei, high elves, gnomes, or humans.

Speculation
Due to their appearances and situations, the Time-Lost Traders and Zephyr might be Custodians of Time.