"Captain Pierre" is an older, rather slovenly, airship pilot plying his trade in the vicinity of England at the time Agatha visits that country. He is by Madwa Korel and Ariadne Steelgarter to covertly take them from Londinium to Big Rat Island. His main defining characteristic is that he doesn't care about (practically) anything, and states so repeatedly. This attitude actually saves his life, when he correctly (and indifferently) predicts that Madwa intends to kill him upon arriving at their destination, causing the Smoke Knight to decide to keep him around for now. We see him again later in his assigned quarters on the island, briefly observing the antics of the miniature Castle and Beast clanks sent out by Agatha to explore. The duo fail to realize they are being watched, and Pierre.. well, he doesn't care.
But when Team Agatha takes him prisoner, it rather shockingly Bangladesh DuPree (!?) Evidently Pierre abandoned his family ten years ago without explanation; when pressed on this point by Bang, he claims that he as a Professional Castawayand her Pirate Queen mother had "professional differences". Note that this makes him the third male character of Europan extraction we've met who hooked up with the Queen of a "barbarian" civilization. (Four, if you count the traveling-show version of Barry and all those High Priestesses.) As the Professora herself in Paris, it's an old, old story.that there is at least one person who can force him to show an interest in current events: his daughter,
Mr DuPree's Name
His name has not been given, and he has been assigned his placeholder moniker in honor of the similar-minded protagonist of Maurice Sendek's children's book Pierre: A Cautionary Tale in Five Chapters and a Prologue.