When he talks, he often peppers his speech with stereotypical 1920s American mobster slang, using phrases such as 'Now scram!', or 'the Big cheese'. This possibly goes to show just how high the stakes were for him if he lost, as well. 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. 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. 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. King Dice is an extremely sleazy, deceitful, untrustworthy, and manipulative individual.

The buttons on his waistcoat are black, his bowtie is fuchsia purple, and his eyelids are silver. In The Cuphead Show!, his design stays the same as in the game, but with small changes. When illustrated as behaving in an especially devious or threatening manner, he is also sometimes shown with bright, green colored irises. He also has a pointed black mustache, high black eyebrows and shiny purple eyelids. He is shown wearing white dress gloves and purple dress shoes that match in color with his purple tailcoat, lavender waistcoat, dark purple pants and bow tie. In this case, the single purple pip in the center of the die's face serves as his nose. It is only side number one that has the features of a human face, with eyes, eyebrows, a mustache and a mouth. In the same manner as a conventional six-sided die, faces two through six are painted with their own corresponding number of round, purple pips. King Dice is roughly six feet tall, having the body of a human man, but with his head being modeled after a floating die.

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