Ainu culture
Anyone familiar with how the Ainu are portrayed in anime and manga probably immediately noticed the Ainu elements in Imuchakk. Headbands are one; headbands with such patterns are a known Ainu attire. Another thing are the names of the Imuchakk people: Hinahoho, Kikiriku, Rurumu, Imsisika... A stereotype for Ainu names in Japanese is that they have a lot of repetition such as "kiki" or "sisi" here.
The name Imuchakk also fits this... "Imuchakku" in Japanese, the name resembles Kamchatka (Kamuchatsuka). This is an area in Russia to which the Ainu are indigenous to.
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