My new favorite word (at least for this week): Sprechhund.
It’s also, apparently, a script writing tool:
I thought you were pulling our leg when I first saw that, so had to go google. Found this on a site … Below is the babel fish interpretation:
Sprechhund: Literally “stupid with which to speak,” it is a character making it possible for another to voice “confidences.” Examples: it is his/her girlfriend, her dog, its neighbor of stage, her psychoanalyst who, by the means of a discussion, allows the character to make pass from information on him or on the action.