Captain Whitfield serves as a mentor and father figure to Manjiro, showing him kindness and serving as a bridge between cultures. He is a wise and supportive leader throughout the story.

Jolly, a sailor with a misleadingly cheerful name, and Tom, a young man who lives on land, both represent individuals who discriminate against Manjiro due to their biases. Their interactions with Manjiro highlight his resilience and capacity for empathy.

These fishermen friends of Manjiro represent traditional Japanese culture and are contrasted with his willingness to embrace new cultures. Their experiences underscore different responses to cultural exchange and adaptation.

Terry is Manjiro’s lively and energetic friend in Fairhaven who encourages him to embrace adventure. His presence brings a playful contrast to Manjiro's more thoughtful demeanor.

Catherine briefly takes on the role of Manjiro’s love interest, showing him kindness despite societal norms. Her interactions inadvertently expose the challenges Manjiro faces in being accepted.

Mrs. Whitfield is a mother figure to Manjiro, providing warmth and fairness. She advocates for equality and serves as a stable force in Manjiro’s life.