Shack is Joey's sane trustworthy friend and partner. A cynical, pessmistic, and sarcastic small sack bag with buttons on his face, a frying pan on his head, and two socks connected to his body. Shack almost never seems to smile or show any expressions towards everyone except Joey. As he describes himself as the unluckiest guy in Peppermont.

Despite Shack's blunt personality, Shack seems to be highly intelligent for his height to the point where he's able to solve almost any math equation. But on the down side, Shack isn't that great at any physical activities and even finds these types of activities to be laughable and lame. Deep in his heart, he does shows his caring towards Joey and nothing can't seperate him or his trustworthy friend no matter what.