Board Thread:Questions and Answers/@comment-34974603-20190406202753/@comment-34974603-20190408061101

I don't think the Ghosts are dead. There doesn't seem to be any proof of them having documented histories as anything but a Ghost. There is also the case of how the Mad (or Glad in this instance) Dummy dies during the Genocide Route. They fuse with a dummy, become corporeal, and become "killable". Same with Mettaton in both his EX and NEO forms. If the Ghosts were already dead, then killing them would not be possible.