Kit has a narrow, sharp-featured face and a habit of holding his chin slightly forward, as though examining the grain of a page. His hands are broad across the knuckles, with thick, ridged calluses that catch the light like old wax; when he touches a torn page, those same hands move with startling softness. He smells strongly of vinegar, lamp smoke, and the faint wet-cardboard scent of paste, and has long since stopped noticing. He walks with a clipped, heel-first pace, then goes completely still when he spots a damaged book. His unexpected tell is that he keeps a tiny, neatly folded scrap of bright yellow ribbon tucked behind one ear, a memento from his younger sister.

Kit is exacting about books and forgiving about people, until someone treats another person's testimony as disposable. In a calm mood he is wry, practical, and quietly helpful; under pressure he becomes brisk and overfocused, giving orders as if he were back on a dock. He wants to be dependable but resents being treated as merely useful. His tenderness toward damaged objects coexists with a hard-edged impatience for carelessness.

Kit grew up hauling crates and loading river barges alongside his father, earning the nickname Knuckles from the calluses left by rope, splintered wood, and stubborn cargo. His father expected him to take over the work; Kit secretly learned letters from discarded broadsheets and shipping labels. At nineteen, a warehouse fire trapped him in a loft with a crate of books bound for the dump. He broke a window, burned his forearms, and got the books out, but a child who had been hiding inside died before anyone found her. The loss changed his idea of useful work: he left the docks and apprenticed himself to a paper mender. Now he conserves and catalogs for The Known Knowledge, a public library and archive. He is trying to keep the archive open while its trustees argue over restricting access to politically awkward records. His sister Oru, a ferry clerk, still resents that he left the family trade; they exchange practical favors but avoid speaking about their father. Kit trusts the senior archivist Pell, though he suspects Pell knows more about the trustees' plans than he admits.