Duḥkha

Duḥkha (苦, Ku) was a traveling, haling from the , up until the Fire Nation's attack on the temple, where they sought to capture Air Nomads and solely use them for cultivating a new generation of Air Nomads that followed Fire Nation ideologies. He was able to escape, with the help of other Air Nomads, and is the only known free survivor of the raid on the Eastern Air Temple. During his escape, he found himself within the, where he luckily stumbled upon , taking refugee there.

Since entering Wan Shi Tong's Library, Duḥkha has never left the building physically, only leaving it. As he roamed the lands in his spirit form, he attempted to find his fellow Eastern Air Nomads, only to find that the other Air Temples were not fairing too well either. This made him realize, despite the amazing ideals he's been taught since he was young, the Air Nomads are a rather weak race simply because of their reluctance to fight. This epiphany has caused Duḥkha to turn against most of the common Air Nomad ideologies and wage war against the other nations, all within the confines of Wan Shi Tong's Library. Through his practice of his Spiritual Projection, Duḥkha has gained the ability to override bodies and control them for his own benefit.

Trivia

 * Duḥkha's name is derived from the Buddhist concept with the, where it's commonly translated to terms of "suffering", "pain", "unsatisfactoriness" or "stress".
 * Duḥkha uses the design of Miroku from the series Inuyasha.