Frey lives in Seikan Women's University's "Goddess Dormitory." She has a slender build, large breasts, blue eyes with thick eyelashes, and long, wavy blond hair reaching her hips. Her hair features bangs typically covering the right side of her face. She consistently wears a black and white frilly maid dress, a matching black headband with a frilly bow on its left side, and black boots.

Her personality mixes bashfulness and general cheerfulness with strong-headed determination, most evident in her unwavering insistence on wearing her chosen cosplay outfits regardless of outside opinion. She is particularly persistent in using these outfits to gain the attention and admiration of the young dorm mother, Koushi Nagumo.

Frey's primary passion is cosplay. She actively designs, sews, and models intricate costumes. Her enthusiasm often leads her to forcibly dress other dormitory residents, including Koushi, in her creations. She frequently summons Koushi to her room, asserting that building relationships with residents is part of his dorm mother duties, using this to involve him in her cosplay activities.

A notable incident involved Frey attempting to initiate a romantic encounter with Koushi while wearing a specific cosplay; this attempt was interrupted and halted by fellow residents Atena Saotome and Kiriya Sensho. Frey derives her name from Freyja, the Norse goddess associated with love, fertility, beauty, and intercourse.