Talk:Upcoming ERB suggestions/@comment-25108693-20140827011855/@comment-5264252-20140827012532

It's not exactly similar, actually. The Doctor can not regenerate if he's killed too fast. He regenerates while dying, but if he dies too fast, he won't have enough time. As well, he still needs his body to regenerate. An Avatar could have their body explode completely, but it wouldn't matter as the essence of the Avatar is carried on to an entirely different being. And the Doctor has up to 13 regenerations, while the Avatar can go on forever unless harmed while in their Avatar state.

But yeah, it'd pretty much work like that, although instead of regenerating backwards, Aang would regenerate forward into Korra.