Pillow is a Cocotama originating from a long-cherished and beloved pillow. This character possesses the innate Cocotama power to induce instant sleep in others, reflecting a deeply ingrained, perpetually drowsy disposition. This manifests as sudden, frequent naps occurring at any moment and a slow, sleep-laden manner of speaking that often fades mid-sentence.

Initially, Pillow's extreme sleepiness occasionally interfered with responsibilities or caused minor accidents, like forgetting essential objects or dozing off mid-task. However, Pillow consistently displays genuine care and affection for human children, particularly those who treasure their possessions, and forges strong connections with fellow Cocotama.

Over time, Pillow grows into a more dependable presence within the group. While the fundamental sleepy nature remains central, Pillow learns to marginally control this tendency and contributes effectively to Cocotama missions and support for human friends. Pillow exhibits a specific fondness for pudding. A notable close bond forms with Melty, the Cocotama born from a pen; Pillow frequently seeks comfort by napping atop Melty, and Melty regularly aids Pillow during bouts of drowsiness.

Pillow actively engages in all Cocotama group endeavors and adventures, strategically deploying the sleep ability when necessary to assist humans or other Cocotama. Pillow's journey illustrates a subtle evolution from a figure primarily characterized by sleepiness to one who, while still overwhelmingly sleepy, operates as a trusted and treasured community member, esteemed for inherent kindness and unique talents.