Board Thread:General Discussion/@comment-5808856-20150312001702/@comment-8161155-20150730012513

My guesses:

The mayor (although I'm like 90% sure he will die, I hope that he doesn't count as THE death, because no one cares about him)

Stanford Pines (It would be sort of a sad, ironic example of Status Quo is God )

Old Man McGucket (I don't know why but I can easily imagine him doing a Heroic Sacrifice)

Bill Cipher (I REEEAAAALLLLYYYY hope it's not him, but it very well could be)

I think it would be cool if it was Dipper or Mabel, but I highly doubt it.