Seeker

Seekers are mysterious members of the Order who Jonas says are not Watchers or Shadows. Of the two, Jonas says that they are more like Shadows, but "not as jacked up and younger." Not much is known about them, but the name seems to indicate that they are people sent out by the Order to retrieve or "seek for" a person they want. In the video Shadow of Death, Emma jumped on a Seeker, supposedly killing him.

Currently, the name "Seeker" has not been confirmed by any character in the show. However, the videos they appear in contain the YouTube tag "seeker," so this is the name currently associated with them.