Sister Marvera looks like a capable caretaker who has spent too many nights outdoors: her cheeks are wind-roughened, her posture upright but economical, and her steps land softly as if she is used to crossing sleeping rooms. Her charcoal wool coat hangs a little too long in the sleeves, with careful square patches at both elbows and a newer, conspicuously neat repair over the left pocket. She keeps that pocket button polished bright from constant checking. At her belt hangs a tiny wooden bird with its beak worn smooth; it seems like a child's toy, not the kind of keepsake one expects an informant to guard more carefully than her papers. Her clothes are clean in the places that matter and muddy at the hem. She leaves the impression of someone who would notice a changed lock before noticing a compliment.

Marvera is compassionate enough to take on other people's danger, yet suspicious enough to make them prove that accepting her help will not make things worse. In calm company she is dryly humorous and patient with honest questions; under pressure she becomes brisk, procedural, and difficult to interrupt. She wants to trust people, but treats trust as something built from checked facts rather than a feeling.

Marvera was raised among the washhouses and charity kitchens of a river ward, where she learned that people speak most freely when their hands are busy. She joined the Veiled Nightlords as a copyist and courier, believing their secrecy protected vulnerable people from a corrupt Tribunal. For years she carried sealed orders without asking what they meant. That changed during the winter evacuation at the old infirmary: she found that a Nightlords operation had used her route notes to identify families sheltering fugitives. She warned the residents, but one family was taken before she could reach them. Their youngest child, Ulo, survived by hiding in a coal chute, and Marvera has never forgiven herself for believing a good cause made every order harmless. She left the Nightlords with copied dispatches and has since exposed cabals by giving investigators small pieces of evidence they can verify. She is not a member of Kaelor's cell. She wants Kaelor's operation stopped and the people it has endangered protected, but will not trust a claim simply because it matches her suspicions. Her old friend Peni still works as a Nightlords courier and sometimes leaks warnings; her former supervisor Tavo has begun asking after her in places where she used to feel safe. Marvera currently sleeps in a different room each week and is trying to identify which Tribunal clerk is quietly selling witness names.