ignorant. She often confuses words, especially names, with other words that rhyme with them or of which they remind her; "Haddock" is frequently replaced by malapropisms such as "Paddock", "Stopcock", or "Hopscotch", while Nestor, Haddock's butler, is confused with "Chestor" and "Hector". Her own name means "white and chaste flower": a meaning to which Professor Calculus once refers when he breeds a white rose and names it for the singer. She was based upon opera divas in general (according to Hergé's perception), Hergé's Aunt Ninie (who was known for her "shrill" singing of opera), and, in the post-war comics, on Maria Callas. Other recurring characters include Nestor the butler, Chang (or Chang-Chong-Chen in full) the loyal Chinese boy who, like Tintin, is not defined by a particular backstory, Rastapopoulos the criminal mastermind, Jolyon Wagg the infuriating (to Haddock) insurance salesman, General Alcazar the South American freedom fighter and President of San Theodoros, Mohammed Ben Kalish Ezab the Arab emir, and Abdullah his mischievous son, Dr. Müller the evil German psychiatrist, Oliveira da Figueira the friendly Portuguese salesman, Cutts the butcher whose phone number is repeatedly confused with Haddock's, and Allan the henchman of Rastapopoulos and formerly Haddock's first mate. Settings The settings within Tintin have also added depth to the strips. Hergé mixes real and fictional lands into his stories. In King Ottokar's Sceptre (revisited once more in The Calculus Affair) Hergé creates two fictional countries, Syldavia and Borduria, and invites the reader to tour them in text through the insertion of a travel brochure into the storyline. Other fictional lands include Khemed on the Arabian Peninsula and San Theodoros, São Rico, and Nuevo Rico in South America, as well as the kingdom of Gaipajama in India. Apart from these fictitious locations, Tintin also visits real places such as Switzerland, the United Kingdom, the United States, the Soviet Union, Belgian Congo, Peru, India, Egypt, Morocco, Indonesia, Nepal, Tibet, and China. Other actual locales used were the Sahara Desert, the Atlantic Ocean, and the Moon. Research Hergé's extensive research began with The Blue Lotus; Hergé said that "it was from that time that I undertook research and really interested myself in the people and countries to which I sent Tintin, out of a sense of responsibility to my readers". Hergé's use of research and photographic reference allowed him to build a realised universe for Tintin, going so far as to create