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Numenera and the Cypher RPG system has an easy way to manage this.
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Often some quick statistics are all we need to run most NPCs and monsters. Monte argues that the details our game needs for player characters to stay interesting doesn't apply to NPCs or monsters. A game that explores how well a PC is at combat, at interaction, at a wide variety of skills and actions, and makes all those things equally interesting is a great game. That's because the game has all these great rules for fleshing out PCs and making them cool and interesting. NPC (and creature) detail is one of the ways in which designers and GMs are often forced to waste a lot of time. These non-playing characters (NPCs), he argues, just show up, talk for a bit, and disappear forever. Monte Cook, designer of the third edition of D&D and the Numenera roleplaying game, wrote an interesting article called PCs versus NPCs in which he discusses the time we often waste putting together statistics for NPCs.
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