So was the night king possibly a dead targaryen? Is that how he could survive fire and fly a dragon? I'm a little disappointed we never actually got to see him fight. The only thing he ever did was kill a dragon and walk around raising the dead?
The sister thing is unforgivable but we've all been wrapped up by some serious clam. I can't hate on him for that. He's redeemed himself with brienne of tarth.