Sephiroth is a demi-god. So is Kefka.

Quote Originally Posted by champagne supernova View Post
Um, technically Sephiroth doesn't kill Aeris or Shinra, because he was chilling at the North Pole and he got his mummy to do it for him. But he did kill Tifa's father, so he has one at least.
He was using Jenova's brain-dead body as a host for his consciousness. So technically, he killed Aerith.