Master Huntress Munashii
It would be an interesting idea, but I think the spirit of the Avatar was meant to only be in one physical body. However, if something went wrong...
It may become split? There would be a lot of complications though. Like, what would happen if one of the twins dies in the Avatar State? Will the other lose their powers?
Yeah, I agree with all of you guys in that the Avatar spirit can only inherit one body but it would be an excellent twist ...
Fanfiction mode activated!
Hey, it would be the same with genetic engineering. Do you reckon, if the Avatar world ever got to it, that they could have people with mutiple bending abilities by genetic engineering? Weird, I know, but it's a fascinating idea.