Here it is: the squeezed-in blog on the Antagonist, from Aristotle’s Essential Characters (with funky names) to our modern take on those pesky evil-doers we love to hate.
Any antagonist—the primary conflict-creator—should seek a goal that is mirrored to the protagonist.
For writers, this is reflecting the protagonist’s goal.
The conflict between the protagonist and the antagonist may occur over the same treasure, the same career advancement, or the same approbation from the community. The antagonist may want the destruction of what the protagonist is trying to create. S/he will twist any concept that the protagonist developed to improve the world.