The Calculus Affair
Jolyon Wagg is based on a salesman who came to Hergé's door and invited himself in, but also on a stereotype of what Hergé called a "belgicain", a petty-minded Belgian lacking self-awareness. Wagg appears late in the series, starting with "The Calculus Affair", where his self-importance and insensitivity enrage Captain Haddock. Wagg also appears in "The Red Sea Sharks", "The Castafiore Emerald", "Flight 714 to Sydney" and "Tintin and the Picaros".