According to the West End production's website, she is 23 years old. Kate is a kindergarten teaching assistant. She is an assistant kindergarten teacher who works for Mrs. Thistletwat. She would like to open a school for monsters someday though. Even though she's performed by D'Abruzzo in the original Broadway show, the character's voice sounds like that of Prairie Dawn, who was performed by Fran Brill until her retirement; now Stephanie performs Prairie using her Kate Monster voice. In an advertisement for the show, she was described as a "Slightly overweight puppet seeking [a] soulmate."