The GoT cast is divided into starring members (names listed during the initial opening sequence) and guest starring members (names listed after the episode). Over the course of the entire series, 3 characters played by guest starring cast members have appeared far more often than most guest stars. These three characters have, in fact, appeared in more episodes than major characters such as Melisandre, Tormund Giantsbane, or Margaery Tyrell (according to imdb). Name TWO of these THREE characters. (provide either first or last name...once you move past the major houses it gets much clearer)
Grandmaester Pycelle, Podrick Payne, Eddison Tollett