Ymir is the daughter of the Dwarf King, and the manager of his steel mills for the past fifty years. She's entered the Queen's Blade to prove that Dwarven weapons are superior, especially superior to those of her business rival Cattleya. Ymir is very competitive, as throughout the series, she reiterates that her weapons are the best weapons and ensures that they are far better than Cattleya's. She does carry some traits of a child, such as her frequent whining. Cattleya also views her as a child