Antagonists are NPCs in Goat Simulator that will attack the Player
Turdles

3 of the 4 micheal bay turdles
The Michael Bay Turdles are NPCS resembling that of Shrek and the Teenage mutant ninja turtles, they can be found in the sewers of goat city bay and will attack the player upon entering they're room.
Marie

Marie as seen in-game
Marie is an NPC found in various maps, normally she will not attack the Player, but when found in Cabrito Park Beach (Goat City Bay) she will attack the player.