As revealed in "Feral Friends", the French narrator wears an old-fashioned 1900s diving suit with a gold tint. On top of his helmet, he wears a red beanie cap.
The narrator is based on Jacques Cousteau, a marine researcher and one of SpongeBob creator Stephen Hillenburg's idols. Cousteau's son, Jean-Michel Cousteau, made a guest appearance in a special feature on The SpongeBob SquarePants Movie DVD, talking about the real-life species that inspired the characters on SpongeBob.
Not counting the theme song, he is the first character to speak in the series, as he opens the pilot episode "Help Wanted" with an introduction to SpongeBob.
In "Mimic Madness", SpongeBob imitates him and wears a red beanie cap in his likeness.
In the 2016 pre-Broadway run of the musical in Chicago, the French narrator was voiced by Mark Ledbetter. For the final Broadway version of the show, Tom Kenny specially recorded his lines as the narrator, and the recording of them is played throughout the musical.