CubicsRube
Hero
If my players develop an interest in npcs that I didn't have more plans than a 'one-liner' for, they get 'promoted' to 'real' npcs. For that purpose I always have a list of names ready. We're playing an RPG here, not a video game.
One of the great things ive learnt from dungeo world was "to leave blanks". Im running a campaign where some npcs i thought would play a part have caught no interest and otherrs who were mere flavourings have become major forces.
One for example was a witness to a cri me in the first session. Thats it. He's now become a crimelord and protector of the common people and a major political player in the key city of unknown motive.
If I'd writte out too much for him then none of that would have been possible