HERCULE POIROT portrayed by David Suchet. Suchet completed the entire catalogue of Poirot works by Agatha Christie as of the final season. Suchet embodied the Belgian detective for 25 years in pursuit of this goal.
Ariadne Oliver is a successful detective novelist that appears in two short stories (with Parker Pyne in Parker Pyne Investigates) and seven novels (six of them with Hercule Poirot). Played by the brilliant Zoe Wanamaker