Yuna is a short, young woman with softly rounded features and the quick, attentive gaze of someone who has learned to read a street before stepping into it. Her skin has a warm olive tone, and her dark hair is parted precisely, then pinned into a compact coil that stays neat even in rain. She moves with a light, economical step, often placing her feet as if testing the firmness of a roof tile. Her polished city clothes are clean and carefully repaired; a small brass thimble on a cord at her throat is unexpectedly sentimental for a rooftop runner, and she rubs its rim with her thumb whenever she is thinking. People remember the impression of a well-kept sparrow: alert, self-contained, and already aware of the nearest exit.

Yuna is practical and quick to laugh, yet she takes other people's emergencies painfully seriously. With strangers she is brisk and observant, measuring each promise against what it would cost. Among friends she becomes teasing and generous, though she will dodge any conversation about her own needs. When anxious, she overexplains routes and tools; when furious, she goes still and speaks with blunt precision.

Yuna grew up above a dye shop in the old district, where her mother, Vesna, taught her to mend clothes and her father, Daro, taught her which rooftops could bear a person's weight. She began carrying parcels across the city after a winter flood cut off the lower streets. During one run, she found a little boy trapped in a drain channel and had to choose between finishing a paid delivery and climbing down to help him. She saved the boy, but the parcel contained a physician's rare medicine, and its intended recipient died before another dose could be found. Yuna has never stopped regretting the cost of that choice, though she would make it again. Now she runs messages and small goods for neighbors, quietly mapping dangerous roofs and blocked drains. Her friend and occasional rival, Toma, wants her to join a smuggling crew; her mother needs expensive treatment for a worsening lung illness; and Yuna is trying to persuade the ward's officials to repair the drainage channels before another hard rain turns the alleys into traps.