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Jirō is the central protagonist of the story. His origins are rooted in tragedy and cultural duality, as he was born to a Japanese ninja father, Tarōza, and an Ainu mother, Oyaruru. As an infant, his father refused to continue a mission for a powerful monk, leading to the family's violent destruction. During this attack, the monk scarred Jirō across the face and set him adrift in a canoe on a river. He was found and rescued, eventually being raised by a kind innkeeper and her daughter in the village of Sai on the Shimokita Peninsula.

Jirō’s personality is shaped by a deep and persistent drive for answers and justice. He begins as a determined but somewhat naive young man, heavily influenced by the circumstances and people around him. As he uncovers the truth about his past, he becomes more calculating and resilient. His journey forces him to confront profound betrayals, which temper his initial impulsiveness into a focused resolve. He is adaptable, capable of surviving in vastly different cultures and environments, from feudal Japan to the American frontier, and shows a capacity for forming meaningful bonds with a diverse cast of characters.

His primary motivation stems from the brutal murder of his adoptive family. After finding their bodies and a strange dagger, he is falsely accused of the crime by his village. Forced to flee, he seeks the truth about his origins and the identity of the real killer. This quest becomes a revenge mission against the manipulative monk Tenkai, who tricked Jirō into killing his own biological father. As the story progresses, his motivation evolves from simple personal vengeance to a broader understanding of the political schemes at play, ultimately leading him to use the treasure he finds to help fund the overthrow of the Tokugawa shogunate.

In the story, Jirō serves as the central figure through whom the narrative’s mystery and historical events unfold. He is initially a pawn, trained in ninjutsu by Tenkai’s subordinates, Shingo and Sanpei, as part of a long-term scheme to find a legendary treasure. He journeys from the northern island of Ezo to the United States, his path crossing with historical figures and events. His role transforms from a seeker of personal truth into an agent who influences the larger political upheaval of the Meiji Restoration. He recovers Captain Kidd's treasure and redirects it to support the Satsuma-Choushuu alliance against the shogunate.

Jirō’s key relationships are complex and often fraught with betrayal and revelations. His relationship with Tenkai is the central antagonistic dynamic; the monk is his manipulator and the architect of his suffering. Jirō’s most poignant relationship is with Oyuki, a female ninja sent to kill him. After defeating but then saving her, they develop a strong bond. He later learns that Oyuki is his half-sister, the daughter of his father Tarōza. He shares a meaningful connection with his biological mother, Oyaruru, whom he finds late in his journey, only to see her killed by Tenkai’s scheme. Other significant relationships include Uraka, an Ainu man who helps him escape imprisonment, the elderly scholar Andō Shouzan who helps decode his father's notes, the sailor Sam whom he frees from slavery, and a French-Indian woman named Chico who aids him in America.

Jirō undergoes substantial development, evolving from a frightened, orphaned boy into a skilled and world-weary warrior. His initial innocence is shattered by the murder of his family, and his trust is weaponized by Tenkai, leading to the devastating realization that he killed his own father. This event marks a turning point, after which he becomes the architect of his own quest. He learns to see through deception, as demonstrated when he eventually uncovers Tenkai's use of body doubles. By the end of his journey, his perspective has shifted from a narrow focus on revenge to a broader understanding of systemic oppression and the cost of political change. He leaves the final battle having settled his personal score with Tenkai but also having contributed to a new historical era.

Jirō’s notable abilities are a direct result of his rigorous training in the ways of the ninja. Under the tutelage of Shingo and Sanpei, he masters ninjutsu, becoming highly proficient in stealth, infiltration, and various forms of combat. He is shown to be an adaptive and resourceful fighter, capable of defeating multiple opponents and Tenkai’s most formidable assassins. His skills are not limited to physical confrontation; he also demonstrates tactical deceit and the ability to survive in harsh, unfamiliar environments, from the wilderness of Ezo to the American frontier.
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