Espresso Cookie is a serious, smug, and intellectual perfectionist, and does things with absolute precision. He speaks in a formal and calm accent and is often brief with his words, to the point of rudeness. He shows to have a crush on Madeleine, but refuses to admit it. but there are instances where he doesn’t bother hiding his displeasure or exhaustion (such as when faced with a preventable failure or Madeleine Cookie Madeleine Cookie's foolhardiness). He also uses difficult words.