1)did Zhao have a family?
2)if Koh dies, what happens to the people he stole faces from?
3)can combustion benders firebend?
4)how did the combustion benders get their tattoos?
5) if you're an earthbender, can you metal bend, lava bend, and sand bend if you learn how, or can you choose only one subclass?
6)does weight have an effect on the air benders gliders? Like could an overweight airbender use a glider or would they have to do something else?
7)are firebenders resistant to the flames they produce, or could they be burt by their own flames as well as the enemy?
8a)(spoiler if you havent seen LOK) since Korra started the avatar cycle all over again by severing connections to her past lives, does that mean the avatar state isn't as powerful for the Earthbender after her? Since he only has Korra in the avatar state and all the avatars before her had like 20 billion past lives to draw wisdom and experience from?
8b) could you still find the past avatars in the spirit world, or are their souls/spirits lost forever?
9) could Koh the face stealer even die? I mean, he made reference to the fact that spirits are immortal unless they choose to give up their immortality in order to become part of the physical world. Does that mean he can't die?
10) (spoiler for LOK)since the spirit world and the physical world are now open to each other, does that mean Zhao could be brought out of the fog if someone finds him and knows the way back?
11) can spirits bend?
12)(spoiler for LOK) why the F*CK did nobody tell Korra about Koh the Face Stealer before she decided that letting spirits and mortals enter each others realms freely was a good idea?!