X is a supernatural entity who acts as a 'game master.' He distributes Dice and controls quests, quest content, the onset of the PVP stage and who receives A-Rank quests. He used to be an abused kid but one day he found Dice when they fell to Earth from an unknown origin. He now oversees the Dice system from an undisclosed location and makes decisions according to the entertainment possibilities they entail.
His goal, if any, seems to be to enjoy himself to the fullest.