Ice Witch

The Ice Witch, from "The Ice Witch and the Dragon of Fire and Ice", posed a grave threat to the witches as the titular Dragon two centuries ago. Seeking to conquer the world, she froze the land and those who stood in her way, including Kunetke and Tole, both of whom she took hostage against Gana. When confronted by Gana and her remaining companions, she possessed Gana's young sister, Hanamomo, taking advantage of the fact that removing the penetrating icicle would kill her host. Despite already having great magic, she ate Gana by coercion in an attempt to absorb the magic of the most powerful witch serving the grand master. She seemingly kept her promise to Gana by letting Hanamomo wake up an unfrozen Tole, only to possess Hanamomo again in an attempt to stab Tole In the Back. When Gana managed to escape alive, she decided to seal Gana away as a last resort.

(Source: TV Tropes)