Oboro Kashiwagi is the dedicated secretary to Taizō Kiritsubo, director of the esper organization B.A.B.E.L. She possesses a slender frame, long wavy dark hair, green eyes, and consistently dresses in a formal style.

Her personality reflects extreme dedication and responsibility, prioritizing work above personal entertainment or social activities. This intense focus once fueled workplace rumors of a romance with Kiritsubo, which she firmly denied. Typically reliable and composed, her demeanor transforms dramatically when intoxicated, revealing a violent and reckless side that intimidates even superiors. Despite her stern professional exterior, she exhibits notable patience and understanding specifically toward "The Children" (Kaoru, Shiho, and Aoi), earning their respect during their youth.

Within B.A.B.E.L., she functions as Kiritsubo's indispensable right hand, managing both routine administration and highly classified national secrets. Her responsibilities extend beyond secretarial duties to include oversight of scientific investigations in B.A.B.E.L.'s labs, particularly those led by researcher Shuuji Sakaki. Her multifaceted relationship with Kiritsubo positions her as his most trusted confidant, enforcer of discipline, and de facto caretaker, often retrieving him from childish escapades.

Her physical capabilities are notably exceptional, featuring immense strength allowing her to single-handedly overpower and eject grown men significantly larger than herself. She is also proficient in handling heavy firearms. Her name draws from *The Tale of Genji*, referencing Lady Oborozukiyo, while her surname "Kashiwagi" connects to another character in the same classic.