Hime Yarizakura is a teenage girl who serves as the mayor of Sakurashinmachi, a unique town where humans and youkai coexist. She inherited this position from her grandmother at the young age of nine and takes her responsibilities extremely seriously, often insisting that even close acquaintances address her as Mayor during official duties. Despite her youth, she is deeply dedicated to maintaining the peace and safety of her community, a task she approaches with fervor and an unwavering sense of duty.

Beneath her official title, Hime is a complex individual with a personality that blends strength with vulnerability. On the surface, she often presents a serious, hot-blooded, and frowning demeanor, an attempt to project an image of an unshakeable leader and compensate for a more timid and tearful disposition she had when she was younger. However, this stern facade frequently gives way to her true nature as a kind-hearted and somewhat goofy girl. She is prone to bouts of selfish immaturity, can be a bad liar, and is known for her sudden mood swings from forceful to downhearted, a trait the author has dubbed tsunheko as a play on the more common tsundere archetype. One of her most endearing quirks is her habit of trying to invent and popularize her own historical idioms, which usually confuse those around her.

Hime is a central figure within the Hiizumi Life Counseling Office, which handles supernatural issues in the town. Her most significant relationship is with Akina Hiizumi, her childhood friend. She harbors romantic feelings for him, forming one corner of a mild love triangle, and his safety is her absolute priority; any serious injury to him provokes her to abandon her usual fighting style in a furious rage. Kyosuke Kishi is her ever-present assistant and secretary, who lives with her and tries to manage her schedule and her considerable appetite, acting as a grounding presence. Her deep care for the town and its people is the primary motivation for her actions, driving her to act as both its administrative leader and its first line of defense against any threat.

A defining aspect of Hime's character is her heritage as a dragon youkai, a fact hidden from most townspeople for much of her life. Her immense power was partially sealed in her childhood by Yae Shinatsuhiko, which left a scar on her neck that she hides with a long, distinctive scarf knitted for her by Akina. Yae also used her abilities to make the townspeople forget Hime was a youkai, allowing her to govern from a neutral standpoint, though this memory seal is eventually broken. Over the course of the story, she struggles with feelings of being an inadequate inheritor compared to her grandmother but consistently proves her worth through her devotion and growing strength. Her role in the narrative focuses on navigating the difficulties of managing a town of humans and youkai while protecting it from rogue supernatural elements and other threats.

In combat, Hime is exceptionally powerful, considered one of the strongest demons in the series. She possesses superhuman strength, speed, reflexes, and durability, capable of deflecting bullets with her bare hands and falling from great heights unscathed. Her primary weapon is a lacrosse stick, which she wields with great skill like a spear, a choice reflecting her status as a member of her school's lacrosse club. Her principal youkai ability is the Dragon Spear Sakanade, which allows her to manifest a powerful spear of energy by attuning to the Dragon Pulse of the land, a weapon that becomes crucial when she faces major adversaries like Enjin Hiizumi. Hime also possesses other notable traits, such as an idolatry hair that sprouts a flower when she is particularly happy and a pair of twin stone pendants given to her by her grandmother.