Antagonist

Archetype dyn.pr. Protagonist ↔ Antagonist

An archetypal character who is in every way opposed to the Protagonist

Antagonist and Protagonist are diametrically opposed. What the Protagonist pursues, the Antagonist seeks to avoid or prevent. Together, Antagonist and Protagonist form a Dynamic Pair centered around the story's Goal. In order for one to succeed the other MUST fail.