Kaja

"fire"

- Looks like we have a lot more training to do... after you rebuild the temple.

Kaja was a Fire Sage who assisted Avatar Roku in mastering the Avatar State.

History
At some point when he was a Fire Sage, Kaja was chosen to help Avatar Roku learn to control the Avatar State. Roku managed to trigger the state after five months, utilizing the power of the summer solstice sun. However, he became trapped under its influence and could not control his actions, destroying most of the temple. Kaja eventually managed to free him from the Avatar State and soon ordered him to rebuild the temple. Not long after, Roku managed to master the Avatar State and Kaja's job was complete.

Following the Air Nomad Genocide, Kaja was the first to make a controversial declaration that the Avatar had not died in the attack. Some time later, Kaja fathered a son, who in turn fathered Shyu. Kaja's son fiercely defended his father's views and was eventually executed for defying Fire Lord Sozin.

Relatives

 * Fire Sage Shyu (grandson)

Escape from the Spirit World

 * Chapter 1: Avatar Roku

Trivia

 * Khwaja, which is pronounced as "Kaja", means "master" in Farsi, referencing how Kaja was Roku's master.