What I can Remember:
Arx - Abbas, Ahriman, Gunter (Gunther?) played by Danny D
Thundergulch - Nayati, Thomas (he was a serial killer never got to reveal that in the game and was an NPC slated to die when players figured it out)
The Reach - Pyongyang (staff), Sandeep, Mason
SWII - Head Judge, Han Solo, Drazil
Firan - Asishon

And many more over the years I can’t recall.