Kuron is one of the three Aibar machines that make up the Unicorn Series. These machines are advanced, sentient vehicles capable of independent action, functioning as constant companions and helpers. Kuron, together with the other two Unicorn units Nick and Hikari, follows Koko Ninna‑Nanna wherever she goes. The trio supports her in her movements and assists in planning moves against the Monster Union. Their loyalty and warmth are directed entirely toward Koko, and they act as a close‑knit support unit. As an Aibar machine, Kuron possesses a level of sapience and likely has vehicular form, though its specific combat or transportation capabilities are not elaborated in detail. Within the narrative, Kuron remains a steadfast background presence, never taking a central role but reliably contributing to the efforts of Koko and her allies. The character does not undergo noticeable personal development and instead maintains a consistent function as a dedicated machine companion.