Spybot of Tyrion during the quest 
[31] The Attack!
During this quest, Spybot will be dressed up in a disguise (Priestess Tyriona) so as to draw out Lord Gregor Lescovar.
Note
Spybot is also the name of an anti-spyware and anti-adware program. It is unknown whether Blizzard named this NPC after software designed to eliminate intruders into one's computer.