TV-Series
Description
Rikimatsu Ariko, known by his Ainu name Ipopte, is a soldier of the Seventh Division of the Imperial Japanese Army in Golden Kamuy, holding the rank of Private First Class. He is an Ainu man originally from the area near Noboribetsu in Hokkaido, and his Ainu name Ipopte means to make something boil in the Ainu language. His background carries significant weight in the story because his father, Siromakur Ariko, was one of the seven Ainu men who gathered the gold that became the central object of the conflict, having done so to resist Japanese rule and to fight for the independence of Hokkaido. This heritage places Ariko at the intersection of the military world he serves in and the Ainu people whose fate is entangled with the hidden treasure.

In appearance, Ariko is one of the most physically imposing members of the Seventh Division. He has a very muscular build, a dark complexion, long black hair tied back in a bun, a tuft of beard on his chin, and thick eyebrows that give him a stern expression. A large scar runs across his face, a permanent reminder of his wartime experience. During the Russo-Japanese War, specifically at the Battle of Mukden, the trench he occupied with his comrade Kikuta Mokutarou was bombed, and Ariko was seriously wounded. He barely survived alongside Kikuta and spent a long period recovering at the Noboribetsu hot springs before answering the Seventh Division's call to rejoin the hunt for the tattooed skins that lead to the Ainu gold.

Ariko is a battle-hardened and dutiful soldier whose stern exterior reflects a practical and resilient character. He is described as somewhat combative but otherwise a sensible and reliable man, and he carries the burdens of his wartime past quietly. His most defining trait is the complexity of his loyalties. Although he initially operates as a soldier of the Seventh Division under Lieutenant Tsurumi, he is in fact a spy secretly working for the faction led by Toshizo Hijikata. When Tsurumi discovers this betrayal, Ariko is forced to serve as a double agent, reporting to both sides while trying to navigate the dangers of being caught between them. His motivations are shaped by his Ainu identity, his father's legacy, and the necessity of survival, making his allegiance a constant source of tension throughout his role in the story.

His key relationship is with Kikuta Mokutarou, a superior officer and fellow veteran who fought alongside him in the war and with whom he shares a bond forged in near death. The two continue to act together after their recovery, and Kikuta remains the person closest to him within the army. His relationship with Tsurumi is defined by coercion, as Tsurumi exploits Ariko's exposed position to turn him into a tool for his own schemes, while his connection to Hijikata's faction represents his original act of defiance against the military order. As an Ainu himself, Ariko also shares a cultural connection with Asirpa, the young Ainu girl at the heart of the gold's mystery, and this link to his own people deepens the conflict between his duties as a soldier and his inherited ties to the Ainu cause.

Over the course of the story, Ariko develops from a seemingly loyal soldier into a figure caught between competing powers, with his true position gradually revealed. His arc revolves around the question of where his ultimate loyalty lies, given his father's role in concealing the gold and the ongoing struggle of the Ainu people. His choices in the final part of the series are shaped by this heritage and by the bonds he has formed, forcing him to decide whether to serve the army that commands him, the faction that recruited him, or the people he comes from.

In terms of abilities, Ariko possesses exceptional physical strength and endurance, with a large muscular frame that makes him a formidable presence in combat. His survival of a direct trench bombardment during the war demonstrates his resilience, and his long service in the Seventh Division makes him a capable and experienced fighter. His upbringing in Hokkaido as an Ainu also gives him practical knowledge of the land and its ways, complementing his military training and making him a versatile soldier in the harsh northern environment.
Cast