The Avatar is a non-hereditary process. Each Avatar is from a different nation every time they manifest, so there is no genetic process that would be able to account for how it moves from nation to nation in an understandable form. So a bender who is the Avatar, may pass on their primary element (their native one) and that would be it. The rest of their power is derived from a spiritual connection to the elements from their past lives.
- Avatar Roku (Fire Nation, Roku's Island), 82 BSC - 12 BSC
- Avatar Kyoshi (Earth Kingdom, now Kyoshi Island), 312 BSC - 82 BSC
- Avatar Kuruk (Water Tribes, Northern Water Tribe), Unknown - 312 BSC
- Avatar Yangchen (Air Nomads, Western Air Temple), Years unknown
- Unnamed fire Avatar (Fire Nation), Years unknown
An image of previous avatars, including Aang