Kozakura Zenigata is a supporting character in The Severing Crime Edge. She is a female police officer and the designated Instead for Seigi Nakajima, a young man who possesses a cursed tool known as a Killing Good. In the world of the series, an Instead is a partner tasked with reining in an Author the owner of a Killing Good preventing them from succumbing to violent urges. Zenigata follows Seigi closely to stop him from imposing vigilante justice with his dangerous heirloom, using her law enforcement sensibilities to keep him grounded and lawful.

Her background as a police officer informs her serious, confident, and highly professional demeanor. She is dedicated, intelligent, calm under pressure, and articulate in conversation. Initially, she appears intensely focused on her duty and does not socialize much, but over time a softer, more approachable side emerges. Her primary motivation is to uphold order and prevent Seigi from becoming a killer, while also confronting the chaos caused by other Killing Good users.

As an Instead, Kozakura Zenigata acts as both a moral compass and a practical partner for Seigi. Their relationship is built on supervision and restraint; she constantly watches over him, ready to intervene if his impulses threaten to take him down a dangerous path. Her development sees her gradually opening up, revealing a warmer personality that adds depth to her interactions. She has medium-length blonde hair and brown eyes. While she does not wield a Killing Good or supernatural abilities, her police training, authority, and steadfast presence make her an indispensable ally in the deadly game surrounding the Hair Queen.