Kate de Vries is Matt Cruse's love interest. She's a very bold and straight-coward character, often speaking her mind bluntly. She aspires to be a groundbreaking zoologist, believing there to be life in the skies. Albeit being wealthy, she is still seen was crazy because of being a female. Her studies are often said as false by other zoologists, such as Sir Hugh Snuffler, despite there being evidence (her live aerozoan specimen).
Kate is described as attractive by Matt, having long auburn hair, and not much other information of her appearance.