[yokai]

Hm, I'd like to say Sasuke because it would be so cool if he died in a battle protecting Konohagakure or fighting Naruto. Also, Kakashi should've died in the fight vs Nagato, a charming character but things are that way.

Had Sasuke died then the story wouldn't make much sense. As the story was about Indra and Asura, Yin and Yang working together in harmony and creating peace. For that Naruto and Sasuke ended up equally strong and determined. About Kakashi, are you referring to when Pain (Nagato) invaded Konoha and destroyed the village? Because if so, then Kakashi did die in that fight, along with Hinata and several other Konoha Shinobi. However they were all revived by Nagato when he preformed Rinne no Tensei on the entire village at the cost of his own life.