One of the Horsemen Trio alongside Charlie and Echo. Seth is the fourth 'horsemen' of Death.
Delta represents Famine.
A LIGHT Primeval
The Mandibles circling his eye can pop out and hook onto victims. Once he has them his eyes glows and flicks like crazy causing a hypnotic sequence to occur. This is how he devours his victims.
Speaks in whispers.

Delta(C)