Mei-tan, the eighth-ranked Goat spirit among the Eto-shin, embodies healing and medical support. Her petite 160 cm frame features short pink hair, emerald green eyes, goat horns, and elf-like ears, with no tail emphasizing her zodiac role. She dons a nurse uniform blending practicality and style—a bodysuit, boots, scarf, and belt completing her caregiver aesthetic.

Kind and gentle, she dedicates herself unconditionally to aiding others, refusing to judge patients by their past. Yet her compassionate focus often wavers into romantic fantasies, especially about Takeru Amato, a human she once healed. This Florence Nightingale dynamic reveals an unexpected edge in a special episode, where her fixation twists into darker obsession.

Initially distant from protagonist Nya-tan, Mei-tan forges a friendship through shared missions. Her abilities include entering a human’s Sol/Lull—a metaphysical emotional realm—to mend ailments, though the process exposes both healer and patient to physical risk. She crafts syringed remedies and combats both bodily and spiritual maladies with precision.

Having served as an Eto-shin for two millennia, her name echoes the Japanese bleat of a goat. While her narrative prioritizes supporting allies, pivotal acts like surrendering her zodiac seal to Nya-tan underscore her role in preserving equilibrium among the Zodiac spirits.