She was actually very useful in developing other characters.  Her first role was as Theon Greyjoy's plaything, give us insights into his character before the war.  She then played with Tyrion, adding to his rake's image before growing up as the Hand.  Her scene with Lord Varys not only advanced the plot regarding…

Old Gods: Shintoism, personal, unorganized religion practiced mostly in private and not interested in competition with other religions