Hercule Poirot was a brilliant Belgian private detective whose exploits were chronicled by Dame Agatha Christie. He was also a renowned eccentric, famous for his fussiness and precision--to the point of longing for science to find a means of making chickens lay square eggs. Poirot had a career with the Belgian police, then was evacuated to England in the early days of World War One, which move precipitated his career as a private enquiry agent.
Although his place in the Wold Newton Universe is primarily based on various crossovers, Poirot features in Cheryl L. Huttner's study of the Grandin family, "Name of a Thousand Blue Demons" in Myths for the Modern Age ed. Win Scott Eckert, as a relative of both Jules de Grandin and Sherlock Holmes.