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He works as Arronax’s servant and joins him on the Abraham Lincoln expedition. He is devoted to Arronax almost to the point of parody, several times trying to sacrifice his own life in order to save that of his “master.” Aside from being selfless and compassionate, Conseil is highly intelligent, and helps Arronax with his scientific research.

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He is a highly talented harpooner from Quebec who joins Professor Arronax, Arronax’s servant Conseil, and Commander Farragut aboard the Abraham Lincoln in pursuit of a sea “monster.”  He is different from Arronax as he is bold and brave, doesn't share Arronax's enthusiasm for science. He is the most suspicious of Nemo and the most eager to escape the Nautilus

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A 40-year-old Frenchman who is a professional naturalist and an assistant professor at the Museum of Natural History in Paris. He is the author of a book about sea animals. At the time the novel begins, he is onboard the Abraham Lincoln seeking for a mysterious “monster” (which turns out to be Captain Nemo’s submarine, the Nautilus). This results in the Abraham Lincoln attacking the Nautilus and sinking in the process, maybe killing Farragut and permitting Captain Nemo to take Arronax and his crewmates, Conseil and Ned Land, captive on the submarine.

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Commander of the Nautilus, a submarine that he built in secret and on which he lives. Nemo is a highly mysterious person. His real name and national origin are never revealed, and neither are his exact reasons for choosing to live in a state of self-imposed exile underwater.