Humphrey Van Weyden, a writer and gentleman rescued from the sea by Larsen. At first, Van Weyden is revolted at Larsen’s cruelty and physical violence, and he refuses to believe that such an intelligent man could really believe completely in the doctrine of “might makes right,” no matter what the circumstances. Van Weyden confesses that he is soft and unused to physical labor and that he was called a sissy at school. He gradually comes to admire Larsen’s independence and lack of sentimentality. He cannot accept Larsen’s philosophy, but he is grateful for the opportunity to test himself against the elements and to discover reserves of energy and pluck that he did not realize he possessed.
Thomas Mugridge, the ship’s cook, who is assigned the task of teaching Van Weyden his tasks. Mugridge, a Cockney, despises Van Weyden for his gentlemanly ways and for the privileges that Mugridge has never enjoyed. He bullies Van Weyden and even threatens to kill him, but Van Weyden rebels and eventually masters Mugridge.
Johnson, one of two hunters aboard ship who mutiny against Larsen. Johnson is a courageous rebel who fights Larsen, even though Johnson knows he cannot best the stronger man. Losing his battle against the captain, Johnson and his accomplice, Leach, escape the ship. Larsen catches up with the men and then toys with them, allowing them to drown in their small boats.
Leach, John’s fellow mutineer, whose implacable hatred of Larsen causes him to risk everything to subdue the captain. He escapes from the ship when the mutiny fails.
Maud Brewster, a writer who also is rescued at sea by Larsen. Like Van Weyden, she despises Larsen’s vicious amorality, but also like Van Weyden, she is mesmerized by his titanic will and strength. She is shocked by the inhumanity aboard ship. Although she is frail in health, she confederates with Van Weyden in plotting an escape. The couple succeed and are washed ashore on an island they call Endeavor. Through their struggles, Brewster supplies the inspiration and the grit that sustains Van Weyden. Their respite is short lived: The Ghost also washes up on shore. Although its crew is gone, Larsen remains as the couple’s nemesis. They discover that Larsen is dying, possibly suffering from a brain tumor that has blinded him and is slowly numbing other parts of his body. The couple, now in love, fight desperately to oppose Larsen’s efforts to thwart their escape in a rerigged Ghost. Contrary as ever, Larsen tries to burn the ship, but the couple prevails. Largely at Brewster’s instigation, they nurse Larsen until he dies, evincing an admiration of his indomitability even as they reject his antihumanist philosophy.