User blog comment:Touchinos/Season 12 Finale Spoiler Discussion./@comment-1031724-20170416210058

Probably either Ketch or Mary, Castiel and Crowley are too popular, and Lucifer and Dr. Hess are main villains who never die anymore without redemption first. (Last one that did was Abaddon in Season 9)

Ketch reminds me of Meg to Dr. Hess's Azazel, or Alastair to Lilith