"Six"

Origins
The character of Six was inspired by the songs "The Prisoner" and "Hallowed Be Thy Name" from the 1982 Iron Maiden album Number Of The Beast. He is also clearly the creator's favourite NPC.

Story
Six is a criminal wanted for attempting to form a cult and travel through time illegally. During The "Somewhere In Time" Campaign, the party comes across him and his cult being carried off to prison. They free Six, and he explains to them that he can help them travel through time and defeat the Eternal. He also tells them about the scar on his face and how he got it during a fight with one iteration of the Eternal, though he defeated him.

Of course, while he wasn't technically lying, Six is full of nonsense. In truth, he was using the party as task managers to do his dirty work for him, and once he had all of the power of the Eternal, he took it for himself and became the most powerful being on earth. Of course, the party still kills him at the end thanks to deus ex machina.

Concept Art
(Click on the links to see the photos in full resolution.)