Shigeno Kumiyama possesses long, straight violet hair with blunt bangs, paired with blue upturned tsurime eyes. Her pale complexion and slim physique measure 160cm tall, with bust-waist-hips proportions of 78-53-77cm. She typically accessorizes with earrings, a headband, and a scarf, often pairing them with a skirt.

Born December 19 into a wealthy noble family, she maintains a formal demeanor reflected in her use of "watakushi" as a first-person pronoun. As a private detective at the Mikagura Detective Agency in Taisho-era Tokyo, she employs deductive reasoning and calculated charm to extract information during investigations.

Professionally cool and resolute, she reveals a volatile temper when provoked—especially by remarks about her appearance. This triggers frequent clashes with colleague Tomoe Kanase, though both prioritize each other’s safety, demonstrating unshakeable mutual trust. Shigeno herself initiates teasing that escalates tensions.

Identified as a younger sister in familial contexts, her core traits—intelligence, aristocratic poise, and emotional intensity—remain consistent across official media like "Shin Mikagura Shoujo Tanteidan" and "Elf All Stars Datsui Jan 3," without significant alterations to her fundamentals or backstory.