Touch Watari is the infant brother of Melmo and Totoo Watari. After their mother dies in a car accident, his care falls to nine-year-old Melmo. As a baby, Touch demands constant care, highlighting the challenges of infant caregiving. His presence primarily illustrates the daily realities and responsibilities involved in raising a very young child without parents.

In a key event, Touch instinctively recognizes an imposter posing as their returned mother, revealing an intuitive awareness of family bonds despite his infancy. This occurs when a man named Damon uses a doll implanted with a snake's soul to mimic their mother; Touch and his brother Totoo, who had been transformed into a frog, immediately sense the deception. Touch remains a consistent element representing dependency and the demands of childcare throughout the series. His role centers on his relationship with Melmo and Totoo and the caregiving dynamics following their mother's death.