Polychrome

The sweetest and merriest, but most reckless of the Rainbow's daughters. She wears soft flowing robes that look like cobwebs and are tinted violet, rose, topaz, olive, azure, and white, and her hair is like spun gold. She slides off her father's Rainbow and falls to the ground, becomes lost, and joins Dorothy and her friends in their search for the Emerald City. In a later adventure she becomes trapped on earth for the second time when the Rainbow returns to the sky without her. She joins Betsy Bobbin and her friends in their quest to rescue the Shaggy Man's brother.
Polychrome's uncle is the Rain King.