Day 4 - What is your most memorable NPC?
LOL! This one is easy.
Tafip Ho-Trid was a Thriddle inquistor in a multi-session story arc of the SkyRealms of Jorune RPG campaign that I ran back in 1985 and 1986. He was called in to investigate the player characters are a botched mission for their employer, to keep a set of eyes on them and make sure they were working for their employer's good. Needless to say, Tafip Ho-Trid drove the player characters absolutely nuts during the course of his extended run, but in the end proved the characters to be blameless in terms of the botched mission.