NPCs. Unless you're going to run a campaign with no other characters, they're a necessity. But creating them is a chore, and, unless you come up with tricks and methods for mixing things up, there comes to be a certain degree of... sameness after a while. The same archetypes and character concepts keep showing up. It gets harder to be creative and come up with a unique character concept when you've done this a few hundred or a few thousand times already.
So, to avoid that trap of cookie-cutter NPCs, every experienced GM that I've met has their own tricks for mixing things up a bit. I personally use either an RNG of some kind, or just sit down with a friend of mine who has very different character ideas and talk out concepts. For RNGs, I've used everything from the Transhuman Life Path system (nice, especially for just charting a general course) to a Tarot deck, dealing five cards that roughly correspond to Background, Faction, Pre-Fall, Fall, Post-Fall and using those to get ideas and shake things up a bit.
So, I'm curious as to what other tips and tricks people have come up with. :)
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"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -Benjamin Franklin
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -Benjamin Franklin
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -Benjamin Franklin