An NPC is a non player character. Typically they exist within a game world to further a plot, add to the atmosphere or just for background fun. In Bonfire, this typically refers to the orcs created by other players. They can be added to your game by following the instructions on the Add NPC orcs to game page. They are currently broken down into four main categories Kink based, Story based, Utility or Mixed Usage, Mod Tutorial Orcs.