For questions about NPCs (non-player characters). NPC refers to any character in an RPG whose decisions and actions are handled by the game master (or a designated assistant) rather than by a player.
NPC (non-player characters) refers to any character in an RPG whose decisions and actions are handled by the game master (or a designated assistant) rather than by a player.
For questions about strictly, or primarily, adversarial characters controlled by the game master, use monsters. Or for the main adversarial character(s) see villain For questions about characters controlled by the game master, but who acts alongside the player characters see gmpc.