Rikimatsu Ariko is a male Ainu soldier from Hokkaido in the series Golden Kamuy, known for his role in both historical military events and the central tattooed-skin gold hunt plotline.
He is also known by his Ainu name Ipopte, and is sometimes referred to as Rikimatsu Ipopte Ariko.
Japanese name: Rikimatsu Ariko
Ainu name: Ipopte
His commonly used name, Rikimatsu Ariko, is a Japanese-style name, while Ipopte is his original Ainu name.
In some sources he is written as “Ariko Ipopte,” reflecting both his Japanese and Ainu identities.
Ariko is identified as an Ainu from Hokkaido, belonging to an indigenous community with its own language and culture.
He shows a relatively low sense of belonging or loyalty to any one side, which becomes important in his later double-agent role.
Ariko is described as having brown skin, reflecting his Ainu heritage.
He typically wears his hair in a ponytail, a visual trait that makes him stand out among other soldiers.
A notable feature is the diagonal scar running across his face, giving him a distinctive and somewhat intimidating appearance.
This scar, together with his complexion and hairstyle, makes him very recognizable in a crowd or on the battlefield.
Ariko comes from Hokkaido and is specifically associated with a kotan (Ainu village) near Noboribetsu Onsen, a famous hot spring area.
This village near Noboribetsu Onsen is considered his home base and place of origin.
He is part of the Ainu population that became involved with the Japanese military in the late 19th and early 20th centuries.
His connection to an Ainu kotan strongly shapes his motivations, especially concerning his family and the trauma his people suffered.
Ariko holds the rank of first-class private in the army.
He is one of the Ainu who enlisted and fought in major historical conflicts of the time.
He is one of the 63 Ainu soldiers known to have participated in the Russo-Japanese War.
Despite serving in the Imperial Japanese Army, his personal loyalty to the state and its commanders is presented as rather weak.
Two years before the Russo-Japanese War, Ariko participated in the aftermath of the Hakkōda Mountains Snow March Incident near Aomori.
In this disaster, a training march in deep winter ended in tragedy, and many soldiers died in the snow.
Ariko was a member of an Ainu search unit dispatched to recover the bodies of the victims of this disaster.
This experience linked him early on to military operations marked by extreme conditions and high casualties.
During the Russo-Japanese War, Ariko saw combat as part of the Ainu contingent in the army.
He took part in one of the war’s major engagements, the Battle of Mukden.
In the Battle of Mukden, Ariko was left behind in a trench together with Mokutarō Kikuta.
This situation underlined the expendable way lower-ranking soldiers, including Ainu like Ariko, were sometimes treated.
After the war, the physical and psychological scars led Ariko to a period of recovery.
He went to Noboribetsu Onsen to convalesce, recuperating together with Mokutarō Kikuta in the hot spring area near his kotan.
Ariko’s father was a victim of an Ainu massacre incident, a brutal event in which Ainu were killed because of ethnic prejudice and conflict.
This personal tragedy is central to Ariko’s resentment and his complicated relationship with the authorities.
The death of his father in this massacre becomes the key reason that Toshizō Hijikata is able to recruit him.
Hijikata uses Ariko’s anger and grief to draw him into a plot against Tokushirō Tsurumi and the tattooed-skin conspiracy.
Hijikata recruits Ariko with the goal of betraying Tsurumi and stealing the tattooed human skins that form the map to the hidden gold.
Ariko attempts to betray Tsurumi and seize these tattooed skins but is discovered before he can fully succeed.
Once Tsurumi realizes Ariko’s intentions, he responds by taking Ariko’s family hostage.
To control Ariko, Tsurumi orders him to bring back a mix of genuine and fake tattooed skins to Hijikata’s group.
From that point on, Ariko is effectively turned into a double agent, caught between Hijikata and Tsurumi.
He continues to operate within Hijikata’s faction while secretly following Tsurumi’s instructions, constantly under pressure because his family’s lives are at stake.
Ariko’s closest on-screen military connection is with Mokutarō Kikuta, with whom he shares trenches at Mukden and later recovery time at Noboribetsu Onsen.
Their shared experiences in war and recovery link them as comrades with similar burdens.
He has a past link to Toshizō Hijikata, who draws him into anti-Tsurumi activities by exploiting his family tragedy.
At the same time, Tokushirō Tsurumi becomes his controller through ruthless hostage-taking, forcing Ariko into a dangerous balancing act.
Ariko eventually encounters Hyakunosuke Ogata again while aligned with the Hijikata faction.
Ogata expresses surprise that Ariko is willing to betray Tsurumi’s side, noting that it is unexpected behavior.
In their conversation, Ariko reveals he never imagined Ogata would betray Tsurumi either, highlighting their shared status as unexpected defectors.
This moment emphasizes how fluid and treacherous loyalties have become around Tsurumi, Hijikata, and the hunt for the gold.
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