(Spoilers All) My thoughts on the Night King

Ok, I've been thinking about this for a few days now and I think I have an idea of what you are thinking. So, I'd like to talk about one of my favorite scenes that didn't happen in the books.

I'll give you a bit of backstory first. When we first meet the Night King (Nights King) he has a spear with him. We later find out that the Night King is in fact one of the Children of the Forest who is supposed to have been defeated in the War of the Dawn but is still alive. However, I think part of the reason why it was never revealed that he was the one who killed the children is because he is such an ambiguous character. We also learn that he was resurrected by the Children.

Now, to my thought process. The Night King, as I've been thinking lately, is just some kind of undead monster that was brought back by the Children when they were trying to bring balance to the world. But, I think that the Night King's spear was also a weapon that was meant to kill people (hence why it was in the Night King's possession). I think that the Night King, in the end, was going to end up killing the Others. I think that this is part of what happened in the show. When the Night King got the spear he was going to end up killing the Others. In the books, I think that his spear came from an Others he was trying to kill. He was going to kill the Others in the same way that the Others were going to kill the Children.

In the end, the Night King and the Night Queen were going to kill the children. Maybe the Night King wanted to get rid of the Children to set up the balance between the living and the dead. Maybe this was his plan all along, but it was too late and the Night King finally got to kill the Children of the Forest, so that balance could be established.