This, I did a while back trying to hone my illustration skills. I developed a character generator with a few six sided die to determine what I would draw. I had assigned each number (1-6) to a trait -such as Gruff, Jovial, Sly, etc... then a number for the genre like --Fantasy, Sci-fi, Detective, etc.. then yet another nomber for the type of NPC it might be like Shop Keeper, Royalty/Politician, Street Vender, etc...
Anyway the first roll came up with this guy.