King Dice is an extremely sleazy, deceitful, untrustworthy, and manipulative individual. While on the surface he has the personality of an energetic and easygoing entertainer, he nevertheless can be as cruel and sadistic as his boss, The Devil, when he wants to be. Equally as arrogant and overconfident as the Devil, he nevertheless seems to be the more analytic and cautious amongst the working duo, as it is he who first informs his boss of the potential threat the boys may pose should they successfully fulfill their end of the bargain.

King Dice also takes his own bets very seriously, going as far as to attempt to kill the brothers when they succeed in getting all of the soul contracts after he made a bet that they would fail their mission. This possibly goes to show just how high the stakes were for him if he lost, as well.