Born in the abyssal depths of the Pacific Ocean eons ago, the Nomadic Ningen evolved beyond its regional origins when it discovered ancient oceanic pathways connecting all the world's waters. Through countless centuries of migration, it absorbed knowledge from every cryptid realm it encountered, developing a unique perspective that spans cultures and allows it to serve as both witness to and chronicler of cryptid evolution across the globe.

The Nomadic Ningen possesses a remarkable adaptive physiology that allows it to survive in any aquatic environment from frozen arctic waters to tropical seas, with a partially permeable skin that can absorb and reflect characteristics of the regions it visits. Its most extraordinary ability is a form of psychometric memory, allowing it to perceive the histories of other cryptids through physical contact with their habitats or artifacts. Though primarily aquatic, it can survive briefly on land, enabling it to traverse between bodies of water and observe terrestrial cryptids from shorelines and riverbanks.

The Nomadic Ningen serves as the silent witness and unconscious connector of cryptid species worldwide, its constant migration creating a living thread that weaves together otherwise isolated cryptid communities and preserves their collective knowledge. Its presence in a region often coincides with unusual cryptid activity, as if its arrival signals a momentary thinning of the veil between the known world and the hidden realms of cryptozoology.