Kaja

History
Kaja was a Fire Sage in the times of Avatar Roku. Kaja was the one who would train with Roku one-on-one. Kaja helped Avatar Roku when he was young in his attempts to master the Avatar state. This man is the grandfather of Fire Sage Shyu, who helped Aang and his friends escape from Roku's temple in "Avatar Roku: Winter Solstice Part 2". Kaja lived on Crescent Isalnd with the other Fire Sages.