Which character in the story represents Buck's ultimate loyalty?

The character that represents Buck's ultimate loyalty is John Thornton. Throughout "The Call of the Wild," Buck experiences varying degrees of relationships with different characters, each influencing his journey and evolution. However, John Thornton stands out as the person who genuinely earns Buck's trust and loyalty through kindness, respect, and a deep bond formed during shared hardships.

Unlike the other characters in Buck's life, who often treat him as a mere tool for their own gain, Thornton embodies the qualities of a true leader and friend. His selflessness and care for Buck create a profound emotional connection that goes beyond mere survival or obedience. When Buck chooses to follow Thornton and ultimately risks his life to save him, it exemplifies Buck's loyalty and the deep affection he has developed for his master.

This loyalty is a significant theme in the story, illustrating how profound relationships can lead to powerful attachments, especially in a world characterized by harshness and struggle. Buck’s bond with Thornton also highlights the journey from domestication to embracing his wild instincts, showcasing how true loyalty can coexist with an individual's need for freedom and identity.