Summoned by the gods as divine retribution, Night Wind exists solely to capture Unico after the West Wind defies their command to banish the unicorn to the Hill of Oblivion. The gods decree this punishment because Unico's power to spread happiness challenges their authority over emotional control. When the West Wind instead spirits Unico across time and locations for protection, the gods unleash Night Wind as their direct instrument to enforce the original judgment.

Functionally, Night Wind hunts Unico relentlessly as an antagonistic force. Its pursuit forces the West Wind into constant flight, abruptly severing Unico's bonds with friends and erasing his memories each escape. This dynamic cements Night Wind as the engine perpetuating Unico's endless exile and forgotten past. The entity appears directly during Unico's encounter with Beezle in the 1981 film adaptation, underscoring its persistent threat. Night Wind's involvement remains exclusive to *The Fantastic Adventures of Unico*, with its role confined strictly to enforcing divine will without narrative expansion or background development elsewhere in the franchise.