Well I did some research, (not much) but if I ahd to choose between two lovecraftian monsters. It is either Ctulu or Yig.
Because hey if a gorgon is impossible we could knock out the Lovecraft monster and gorgon all at once.
Though I still think Cthulhu would work fr thelovecraftian monster. Might make a good antagonist for Season 4, when you consider the lore.