"Exterminator" is not an official name.
The "exterminator" is an unknown being that Jevik accidentally calls in Rahi. Although Jevik was calling for an exterminator, it was never actually revealed whether or not he got one, as it's implied that the exterminator isn't actually an exterminator.
Not much is known about his personality, though he was not a fan of being called on the phone.
Nothing is known about the exterminator before he was called by Jevik on the phone in "Rahi", though he was clearly angered and began shouting gibberish towards Jevik, causing the latter to hang up on him. He was called because Jevik and Onipex wanted an exterminator to get rid of the rahi in Onipex's apartment. Because of his confusion to being called, it's implied that he wasn't actually an exterminator.
|Appearances for Exterminator|
- Although Jevik states that he, "...is shouting Spanish...", he clearly is not.
- Even though he is speaking a strange language, he answers the phone with English.