Georges

Georges was Hercule Poirot's valet. He was very reliable according to Poirot.

We are never told his last name.

Personality
Georges was a classical English-style valet who was knowledgeable about English aristocracy. He had no imagination whatsoever, quite like Miss Lemon but in contrast with Arthur Hastings.

Years with Poirot
Georges was employed by Poirot in 1923 and didn't leave until 1970s, before Poirot's death.