Princess Snake

Princess Snake (蛇へび姫ひめ Hebi hime, lit. "Snake Princess") is the princess of a castle on Snake Way. In her true form, she is known as the Goddess of Snake Way (蛇道神しん Jadou-shin). When Goku traverses Snake Way to reach and train under King Kai, Princess Snake tries to steal his heart in her base form, but his sense of loyalty to his family and friends is, of course, far too strong, so she transforms into a terrible giant fire-breathing snake and tries to eat him. Source: Dragon Ball