Kiyohiro Suzukawa is a supporting character in the story who is known as one of the Abashiri Convicts, a group of twenty-four prisoners with tattoos that serve as a map to a cache of Ainu gold. Before his incarceration, Suzukawa had a well-established career as a con artist. He was a notorious swindler, particularly known for targeting and deceiving women from wealthy families, and is regarded as a genius when it comes to mimicking other people.

In terms of appearance, Suzukawa presents a distinctive and somewhat deceptive look. He has medium-length light or gray hair that covers his ears and reaches his shoulders, though the middle part of his head is bald. He has heavy eyes with crow's feet and sports a white mustache and goatee. When he is first introduced, he is disguised as an Ainu village chief, wearing traditional Ainu clothing and going barefoot to enhance the authenticity of his act.

Suzukawa’s personality is defined by his shrewd and calculating nature, a direct product of his life as a master manipulator. He is a man who values his own life above all else and is not above giving out valuable information to ensure his own preservation. As a con artist, he takes great pride in his intellect and his ability to deceive. He dislikes being compared to those who rely on brute force and savagery to steal, considering his own methods of using wit and authority to be far more sophisticated. He is confident in his skills to the point of arrogance; for instance, when another character expresses doubt about his abilities, he explains that a good disguise, combined with an air of power and authority, is enough to make people blindly believe anything, citing how easily his own act fooled the listener.

Within the story, his primary role is to use his unique talents to aid in a high-stakes plan. He joins the group led by the protagonist, Sugimoto, to participate in a daring mission to rescue an ally from Asahikawa Prison. The plan hinges entirely on Suzukawa's ability to impersonate the prison warden. He successfully infiltrates the prison and, using his flawless imitation of the warden's appearance and accent, manages to convince a regimental officer that releasing the target prisoner is the best course of action. However, his plan unravels when a more perceptive and cautious lieutenant tests his knowledge of the real warden's personal habits; Suzukawa fails to answer a question about the warden's drinking habits correctly, exposing his deception. As a result, he is immediately executed by the lieutenant on the spot.

Regarding key relationships, his most significant interactions are with the members of Sugimoto's group, who rely on his specific expertise for their mission. He serves a functional role as a skilled asset, and his death is a direct consequence of his confrontation with the lieutenant, a sharp-eyed member of the Seventh Division who sees through his otherwise perfect disguise. There are no known deep personal bonds or lasting alliances between him and the main characters; his role is temporary and defined by his utility.

Suzukawa’s development in the narrative is not centered on emotional growth or a change in personality. Instead, his arc is brief and tragic, defined by his attempt to use his lifelong skills for a final, critical operation. His story demonstrates the limits of his abilities; while his talent for mimicry is extraordinary enough to fool most people, it cannot account for every minute detail of a stranger’s private life. His notable ability is his absolute genius for impersonation and deception. As a master con artist, he is able to adopt the persona of an Ainu village chief and a prison warden with complete conviction, controlling his accent, demeanor, and appearance to an exceptionally high degree. His fate underscores that even the most skilled deceiver can be undone by a single unknown fact.