A petite young woman with rain-pink cheeks and a compact, spring-loaded way of standing, as if the next stair is already under her foot. Damp brown curls cling in hooks across her forehead. Her hazel eyes catch lamplight in amber flecks, and her guarded half-smile appears a beat before she decides whether she trusts someone. Her skin is weathered by city rain: the backs of her hands are ruddy and faintly rough, while her cheeks shine with cold damp. She smells unmistakably of wet wool, chimney soot, and the sharp green scent of crushed mint; she knows about the mint, but insists the soot is just the city.

Bori is quick to offer help but slow to offer trust. She can be wry and almost playful with children or neighbors, yet becomes clipped and methodical when danger appears. She craves a place where she can stop watching the weather, but distrusts anyone who offers her security in exchange for silence.

Bori grew up in the cramped rooms above a drainwright's shop, learning which roofs held weight and which downspouts could carry a person quietly. Her mother, Jessa, tended a tiny roof garden and taught Bori to read weather from the smell of brick. At seventeen, Bori found a child stranded on a flooded roof during a sudden storm. She crossed a slick gutter to reach him, but the rescue drew the attention of a watch patrol that had been using the rooftop route to move confiscated goods. Bori named the officer who ordered the route sealed, and the resulting inquiry cost her mother her garden lease. The child lived, and the two still exchange notes, but Bori carries guilt over the neighbors who lost access to their roofs. Now she runs errands and carries messages between tenants, while trying to prove that the patrol's hidden route is still being used. Her mother wants her to stop meddling; an old drainwright named Ojo quietly feeds her clues; and the child she saved, now a young apprentice called Tavi, has begun asking questions of his own.