Interesting question! Poe enhances the perverse nature of this story by presenting the narrator as both. By his sordid actions, the narrator is evidently the antagonist; but he solicits the reader's attention, then sympathy, as if he were the protagonist. He even goes as far as to justify his acts as if he himself were a victim of circumstance.
This reversal of roles makes the reader an accomplice of sorts in his crimes, as if he naturally approved of the narrator's acts.
the protagonist is the narrator and the antagonist is the narrator himself, Pluto, and the second cat
the Protagonist is the husband because he is the main character of the story.
the Protagonist is the husband because he is the leading character of the story. The Antagonist is the black cat and or the wife