The gothic setting element in The Cask of Amontillado is the secret room in which Montresor buries Fortunato. "Within the wall thus exposed by the displacing of the bones, we percieved a still interior crypt or recess... for no especial use..." (Poe 5)
The emotional gothic protagonist in this story is Montresor . "You are rich, respected, admired, beloved; you are happy, as I once was." (Poe 3) The emotions that Montresor has towards Fortunato are envy and jealousy. Montresor is jealous that Fortunato is happy and well like as he used to be.
There is some sort of... decay
An example of the gothic element of emotions running high in The Cask of Amontillado is Montresor being strong willed. "At length I would be avenged...but the very definitivenss with which it was resolved precluded the idea of risk." (Poe 1) Montresor was willing to do whatever it takes to be avenged.
Unlucky omens appeared in the story as an example of foreboding. "The foot crushes a serpant rampant whose fangs are embedded in the heel." ( Poe 4 ) This symbolic statement is referring to Montresor as the foot that is crushing Fortunato that is symbolized as the fangs.
The prideful Fortunato shows a sense of beginning a slow process of declining when someone such as Montresor defeats him with payback. "It was succeeded by a sad voice, which I had difficulty in recognizing as that of the noble Fortunato." (Poe 6)
The supernatural gothic element is the unexplained manifestations that Fortunato's bones lay undiscovered for years. "For a half a century no mortal has disturbed them." (Poe 7)