Xergiok is the ex-king of the Goblin Kingdom, with Finn (Whisper Dan) being the current King. He is very mean, and likes spanking other Goblins. He first appeared in the episode "The Silent King," along with all the other goblins.
He looks like the other Goblins, but with a leaf crown. He wears a dull purple shirt, brown shorts and has purple legs, with a green body.
"I salute you brave warrior!" - "The Silent King"