Is there a term in literary criticism for a character who espouses the points of view of the author? Especially, but not necessarily, if that character has no other role in the work. (This is different from a "Mary Sue".)
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A mouthpiece is a person who speaks on behalf of another person, often used in a derogatory fashion. John Galt, for instance, who monologues on the subject at extreme length could be considered a mouthpiece for Ayn Rand's philosophy of Objectivism.
There's also the possibly less apt raisonneur, which Lewis Turco defines as
which also gives surrogate and stand-in as alternatives.