Kuresato, Shion

暮里詩音

The butler of Kuzuha Kirika. While she occasionally appears in her blue-haired older form, she is actually a twelve-year-old junior high school student. At the end of season 3, it is revealed that Jormundgandr, a giant snake she and "Kuzuha-sama" discovered in the Amazon, granted her the ability to transform into her older (male) form. This entity has been controlling both of them in its quest to find the ultimate butler.
She is deeply devoted to her mistress and takes it upon herself to provide the superintendent with the sweets necessary to maintain her energy.