Avatar Yangchen

This is Avatar Yangchen, an original Airbender and the Avatar before Kuruk.
Avatar Yangchen (1559-1659)

Avatar Kuruk

This is Avatar Kuruk, originally a Waterbender and the first Avatar of Aang's cycle.
Avatar Kuruk (1660-1729)

Avatar Kyoshi

This is Avatar Kyoshi. She was the Avatar before Roku and was origionally an Earthbender.
Avatar Kyoshi (1730-1816)

Avatar Roku

This is Avatar Roku, the Avatar before Aang. He was also a Firebending Avatar.

Avatar Roku (1817-1893)

Avatar Aang

This is Avatar Aang. He is the current Avatar. He is also an Airbending Avatar.
Avatar Aang (1894-)

Kamkazi Kymoto

This is Kamakazi Kymoto, the evilest man in the entire world. Only 2 people have seen his real face, avatar Aang and Princess Yue. Trust me, its good his face is hidden like that.

Princess Yue

This is princess Yue, a sexy babe from the Northern Water Tribe. She dies at the end of book 1, Water, but is resurrected back to life by avatar Aang in book 5, Light, after he learns Lightbending, since Lightbending can also be used for healing and resurrection.