2. Jaqen H'ghar
A favourite of many book readers and television viewers is the enigmatic Jaqen Hghar, an assassin who interacted with Arya Stark at Harrenhal, offering to take three lives at her command due to her stealing three lives from the Red God by saving the lives of himself, Rorge and Biter. Arya used the first two deaths on insignificant individuals before tricking Jaqen into using the third to free a group of captive Northmen, who in turn took Harrenhal from the Lannisters. Intrigued by the girl after this, Jaqen gave her a coin before magically changing his appearance into that of a hook-nosed man with a gold tooth Some time later, an individual named Pate met with a man named The Alchemist in Oldtown. This enigmatic individual, who also possessed a hooked nose and a gold tooth, killed Pate, who was then somehow present to welcome Samwell Tarly to the Citadel when he arrived seeking to become a master for the Nights Watch... It would therefore seem that Jaqen Hghar is in Oldtown (which will presumably become an important location now a POV character (Sam) is there) and is impersonating a novice of the Citadel. What is his purpose for this? Will he and Arya cross paths again? I wish GRRM would hurry up with the next book already!