if katara were to have a baby with aang do u think it would end up with meer than one element to bend,like air and water,air because thats were aang came from. of if zuko and katara had a babay what element of elements do u think it would bend.

actually Aang and Katara DO have a son in the new series Avatar: the legend of korra named Tenzin. he is an airbender that teaches Korra to airbend when she is the volgende avatar

I would think not...even if I didn't know already Aang and Katara's son doesn't. I mean, if u know about the new serie that is gonna be air. (Avtar: The legend of Korra. u can google it.)
Anyway I think having two elements would be like wrong, too much power for a person, just the Avatar ought too have meer than one. Just my opinion.