Heck, it would take more energy than I care to expend, but you could easily make a pooka whose whole form of lying is controlling the narrative and putting words in other people's mouths Some sidhe says "Good day" and the Pooka could be "The Sidhe would try to tell us what Good is, what Evil is, in short, they move beyond trying to control our freeholds, they seek nothing less than to control our very souls! Will we allow it? I say no!"