The Electrodeity of Light, Amaterasu, serves as the buddy monster to Miko Mikono. She possesses a well-meaning but notably clumsy personality, frequently shattering plates while working in Miko's cafe. This clumsiness often leads her to self-imposed confinement in a box as punishment. Despite this, she deeply cares for her buddy, adopting a small black cat form ("SD form") specifically because Miko likes cats. She expresses emotions vividly through mannerisms like blushing, sulking, or cuddling, often accompanied by onomatopoeia.

Her SD form appears as a miniature black cat featuring blue tips on its paws and tail, yellow and red eyes displaying red eyeliner when closed, a bell collar, and a sun crown. The ears have red interiors with blue spots, and two white marks adorn the forehead. In her full Electrodeity form, she resembles a beautiful goddess wearing a red and white velvet robe with gold, brown, and blue accents, light black hair with blue highlights, and retains the sun crown. For cafe duties, she wears a red velvet dress over a white blouse, an apron with a bell, a bolo tie, a red velvet bow in her ponytail, white stockings, and red shoes. As a card, she is classified as a Size 3 Monster with 0 Power, 2 Critical, and 8000 Defense, affiliated with Katana World under the Electrodeity attribute.

She first appears possessing Miko to protect her. Later, she assists Miko in the cafe, wearing new attire after a makeover. An incident occurs where jealousy over Miko's interaction with Eden causes her to break a plate, resulting in her retreating into the box again. Her background identifies her as drawing inspiration from the Japanese sun goddess Amaterasu. She is the daughter of Izanami, the goddess of birth and creation, who occasionally visits her under the pretext of checking on her.