Shea Moon is a serpent familiar bound to Hakudou Yayoi, a Beast Knight sworn to safeguarding Earth against annihilation. With a lithe, brown-scaled form, Shea Moon slithers alongside Yayoi as both ally and confidant. Their demeanor blends sagacity with a playful streak, often lightening tense moments with humor. The nickname "Yako," coined for Yayoi, underscores their easy rapport and mutual trust. Bound by duty, their partnership thrives on camaraderie, though the trials they face together remain unspoken. Shea Moon’s role centers on supporting Yayoi’s mission, their interactions marked by wit and an inseparable bond forged through shared purpose.