Tōka Tennōji is the heiress of the Tennōji household, part of the wealthy "Tennōji of the West" dynasty renowned for its historic rivalry with Haruka Nogizaka's family, "The Nogizaka of the East." She stands third in the line of inheritance following the death of the family patriarch at age 147.

She attends Hakujō Academy as a first-year student, nicknamed the "Blizzard Princess" for her consistently cold, domineering, and arrogant demeanor. This reputation arises from her aloofness and demanding nature towards staff and peers.

Significant character development occurs during the "Purezza" storyline when Yūto Ayase becomes her personal butler for one week to earn money for Haruka Nogizaka's Christmas gift. Tōka subjects her staff to grueling demands, resulting in rapid turnover as few last more than a few hours. Yūto's resilience throughout the week earns her unexpected respect and marks a subtle shift in her character, demonstrating her capacity to acknowledge genuine dedication.

Her family background is marked by internal power struggles. After the patriarch's death, the Tennōji household plunged into a fierce inheritance battle described as a "Big, Screwed-Up Family" crisis. Relatives covet the opulent family mansion she inherited, contributing to her hostile and defensive behavior.

Despite her antagonistic introduction, she later shows loyalty and capacity for alliance. In subsequent storylines involving the Nogizaka family and confronting threats like the antagonist Setsugetsuka Tennōji – responsible for Haruka's past ostracization – Tōka aligns with Yūto and Haruka. Her assistance signifies character growth beyond her initial role as a rival.

A recurring element of her persona is her stated ambition of world domination, often noted in character trivia. This goal underscores her grandiose self-image and the scale of her ambitions.