NPCs (Non-Player Characters) are characters that are inLEGO Universe. Minifigures who are only mentioned in the storyline are characters, and not NPCs. Sometimes their names can be a play on a quote, phrase or word. Most NPCs give out a Mission to players that may involve other NPCs. Some may not such as Wally Radish who only gives out some pet tips.
Most NPCs have set locations in the game, but can be spawned by Mythrans by the use of Macro Codes in any location.