Fubi Kase works as an assistant police inspector. She possesses scarlet or dark red hair and golden or orange eyes, consistently appearing in police attire that reinforces her professional image.

Her duties frequently involve interactions with Kimihiko Kimizuka, whom she regards with deep skepticism due to his recurring presence at crime scenes. This suspicion positions him as a regular person of interest in her cases, cementing her role as a pivotal liaison between law enforcement and amateur investigators.

Characteristically, Fubi smokes cigars and maintains a rigorously organized workspace. Her desk deliberately avoids modern technology like computers, instead featuring a landline telephone and physical case files—reflecting a preference for traditional investigative techniques and meticulous attention to detail.

Fubi prioritizes efficiency and directness in investigations, leading to terse, boundary-focused exchanges with civilians. She adheres strictly to procedural integrity, allocating resources based solely on departmental priorities rather than personal appeals.

Visually, she embodies authority through police uniforms or business suits, coupled with a calm yet penetrating gaze. These elements consistently underscore her position within law enforcement hierarchies and her narrative function as a professional counterpart to central figures.