Greed

Greed is a mini-boss and one of the Seven Deadly Sins. It can appear in Shops or Secret Rooms starting on the second floor of Chapter 2.
 * It also has a small chance to spawn when destroying a special shopkeeper.

Behavior
Greed wanders randomly around the room and performs one of two attacks: If hit by Greed, Isaac loses 2-4 coins and drops 1-3 Pennies on the floor.
 * Fires a spread of 3 projectiles in the cardinal direction closest to Isaac.
 * Spawns 2 Hoppers to his either side.

Greed deals a whole heart of contact damage.

Trivia

 * Greed has his own account on Twitter. This was uncovered after the community dug up a figurine of Greed covered in Sharpie marks during an ARG, which quickly led to his account. After guessing his password, and tweeting on it, the password was quickly changed and was then used to announce the arrival of.
 * The Seven Deadly Sins that these mini-bosses are based upon are, in Christian teachings, a classification of vices from which all others are derived from.