Shio Hikawa serves the Lion King Organization as a Shamanic War Dancer. She has short black hair with longer sides, brown eyes, and wears a red school uniform with black mary jane shoes and white socks. Her primary weapon is Freikugel Plus, a mass-produced bow modeled after Lustrous Scale's bow form.

She operates within tactical units, frequently partnered with her former High God Forest classmate, Yuiri Haba. This partnership executes missions such as escorting individuals like Glenda aboard passenger ships and confronting supernatural threats. During operations, Shio exhibits vigilance and combat readiness. While surveilling Gajou Akatsuki at Kamioda Temple, she detected unusual atmospheric changes preceding an assault by demon beasts. Recognizing this signalled trouble at Kannawa Lake, she joined forces with Gajou to repel the attackers and proceeded there. At the lake, encountering Nagisa Akatsuki possessed by Avrora, Shio guarded Nagisa after her collapse while Gajou investigated disturbances.

Shio maintains a fierce rivalry with Sayaka Kirasaka, another Shamanic War Dancer candidate from their High God Forest training, considering each other "mortal enemies" and clashing frequently over trivialities. Despite this, they coordinate professionally during missions, evidenced by their banter during the ship escort before it collided with wrecked vessels.

Her name reflects personal attributes: "Shio" combines "will, purpose" (志) and "thread" (緒), while "Hikawa" means "beautiful, patterned" (斐) and "river, stream" (川).

Shio appears across multiple story arcs: monitoring Gajou during the Fugitive Fourth Primogenitor incident, engaging in the Knight of the Sinful God events at Kannawa Lake, participating in the Roses of Tartarus escort mission, and featuring in the Kieta Seisō-hen OVA as part of Lion King Organization activities.