Envy is based on one of the Seven Deadly Sins and functions as a mini-boss.
- Flies around the room diagonally, bouncing off the walls.
- Envy will split into two heads upon being killed which split into two small heads each when destroyed.
- Heads move increasingly quickly as they split into smaller versions.
- Occasionally, 2 regular Envies will appear in a Mini-Boss Room and the boss message will display "Isaac vs. Super Envy".
- Envy's expressions are a reference to "rage comic" memes, with the biggest and smallest heads showing a troll face and poker face, respectively.