Gandalf was it for Tolkein... assuming LotR was written as an RPG campaign.
Elminster has that role in the Forgotten Realms.
Greyhawk it is had to tell, as the main NPCs in the setting were the PCs from the original days. Maybe the Circle of Eight, but they were standoff-ish.
I don't know Eberron well enough to identify a DM's Mouthpiece.
I know I used such back in my High School days... the NPC that could impart the necessary knowledge to get the PCs on track.
Now I'm trying to identify such an individual in my work location. ;)
In any case, is such an individual needed, or even necessary, in an RPG campaign?
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