My reasoning for them not killing off certain people is they're either too central to the plot or not important enough to kill off. The people they might kill off would be the ones to most likely change the course of the show's destiny (again). The people that are most likely to die; Ozai simply because the final battle may just be a fight to the death, Iroh dying would cause Zuko to grow up (sounds like a good idea that I had seen somewhere else. At first I just felt Iroh is the most likely person to die). The reason Zuko is in the list of people I think might die is because of those redemption theories I've seen of him sacrificing himself. I never really had any reasoning before now, it was just my guess/take on who I think isn't and is going to die.
Edit (reorder)
Zuko
Sokka
Edited on 10/11/2007 7:48am
Edited 2 total times.