Guru

The Guru is an enlightened man who has spirtual connection to the Air Nomads and was a personal friend of. He first made contact with at the Southern Air Temple, after he had attached a note to 's horn.

His goal was to teach Aang to master the. However in order to do this Aang was forced to let go of Katara which he refused to do and instead left the Guru choosing to lose the Avatar State all togther.