Mr. Croup is a fictional character from the novel "Neverwhere" by Neil Gaiman. He is depicted as a sinister and manipulative figure, often working alongside his partner, Mr. Vandemar. Together, they serve as antagonists in the story, pursuing the protagonist, Richard Mayhew. Mr. Croup is characterized by his sharp wit and cruel demeanor. He is known for his ability to intimidate others and his enjoyment of power over the weak. His role in the narrative highlights themes of fear and control within the dark, fantastical world of London Below.