Shade is the curse that is attached to Box. It is an entity of darkness hanging on to Box's face, voicing and unleashing his more dark and dangerous thoughts, typically being the one to force Box to enact them. Only when the box is back on his head will the curse be tamed for the time being.

As a character, Shade is malicious, almost acting like Venom in a sense, but less of a gravelly voice. It is devious and sinister, only wanting the worse for Box and taking advantage of his vulnerable emotions. Its voice may have a bit of an echo to it, but feel free to interpret the creepiness as you wish!