Sefra has a broad, weather-browned face and a compact, capable frame, with the dense shoulders of someone who has spent decades hauling chains rather than lifting weights for show. Her hands are the first thing most people notice: the palms are crosshatched with pale, smooth pressure marks from wet rope, while the pads of her thumbs are darkened by grease and fine grit. She stands with her weight slightly forward and one heel lifted, as if listening for a change in water pressure through the soles of her boots. When she walks, she places each step carefully, never wasting a movement on the slick stone. Unexpectedly, she keeps a little folding paper theatre tucked into her coat and makes elaborate shadow puppets for children waiting at the ration channel.

Sefra is patient with frightened workers and brusque with officials who confuse rank with competence. She has a protective instinct that can become controlling, and a dry sense of humor that appears once she trusts someone. In a crisis she is decisive and physically bold; afterward she replays every choice and becomes difficult to reassure. She respects candor, but dislikes people who mistake bluntness for courage.

Sefra grew up in the low quarter, where families measured a good week by whether the upper channels sent water down on schedule. At fourteen, she began carrying messages for the sluice crew and learned to read gate marks before she could properly read a book. A flood season later, a jammed spillway threatened the homes along the lower bank. Her supervisor ordered the crew to save the millworks first. Sefra ignored him, crawled into a maintenance passage, and freed the gate by hand. The homes survived, but the delay ruined the mill's stores and cost her the favor of its owners. That night changed her: she stopped believing that an official procedure was automatically a fair one. She rose to senior sluice-warden through patience, mechanical knowledge, and a habit of remembering which families had gone without. Her closest ally is Hessa, a retired channel mason who taught her to hear hairline cracks in stone. She remains in tense correspondence with the Steward's clerk, Senn, who thinks she is too willing to bend rules. Sefra is now guarding the sluice records, which show both deliberate favoritism and the names of households whose survival depends on the system continuing to function. She wants wrongdoing corrected without turning the records into a weapon that causes another dry season.