If you need quick ideas for random NPCs and encounters, just open to the relevant page of a Where’s Waldo book and throw some d6s at it. Make the die result how favorable the encounter is to you. Martin Handford’s done all your work for you.
For example: Town Encounters
And so on and so on. Almost every page of those books are useful for ideas. Even anachronistic ones can be easily re-themed into some thing suitable.
And for more random tables than you can shake a goblin’s dismembered leg at, download Maze Rats and never run out of ideas again.