Posted the above before, probably my favorite image from Game of Thrones.
I've never had the privilege of seeing an actual episode of it on TV, and I suppose now I never shall, but what I've seen of well done fan compilations online has made the Arya Stark/Sandor Clegane combination my favorite character dynamic. In a world of seemingly relentless violence and depravity, this anti-hero takes a shattered and pitiable young girl, and, over the course of several months of travel, cares for, and teaches and protects her, though he originally saw her only as a hostage to ransom. It's proved an unexpected hit even with many fans who were critical of the show as a whole.