- Leon Trout, dead narrator and son of Kilgore Trout
- Hernando Cruz, first mate of the Bahía de Darwin
- Mary Hepburn, an American widow who teaches at Ilium High School
- the Kanka-bono girls, a group of young girls from a cannibal tribe living in the Amazon rainforest
- Roy Hepburn, Mary's husband who died in 1985 from a brain tumor
- Akiko Hiroguchi, the daughter of Hisako that will be born with fur covering her entire body
- Hisako Hiroguchi, a teacher of ikebana and Zenji's pregnant wife
- Zenji Hiroguchi, a Japanese computer genius who invented the voice translator Gokubi and its successor Mandarax
- Bobby King, publicity man and organizer of the "Nature Cruise of the Century"
- Andrew MacIntosh, an American financier and adventurer of great inherited wealth
- Selena MacIntosh, Andrew's blind daughter, eighteen years old
- Jesús Ortiz, a talented Inca waiter who looks up to wealthy and powerful people
- Adolf von Kleist, captain of Bahía de Darwin who doesn't really know how to steer the ship
- Siegfried von Kleist, brother of Adolf and carrier of Huntington's chorea who temporarily takes care of the reception at hotel El Dorado
- James Wait, a 35-year-old American swindler
- Pvt. Geraldo Delgado, an Ecuadorian soldier
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