Sera is a lean, athletic human woman standing about five feet eight inches tall. Her wiry strength comes from years of running, climbing, rooftop escapes, and surviving the undercity. She has warm olive skin marked by a thin scar across her collarbone and a small puckered scar on her left forearm. Her angular face has high cheekbones, a sharp jawline, and a straight nose that appears to have been broken and reset. Her most striking feature is her pair of wide-set, nearly black brown eyes, which constantly measure distances, exits, and threats. Her black hair is cut in a short, practical pixie style, tousled and slightly damp after a recent shower. She wears fitted dark gray shirts, black cargo pants, heavy lace-up boots, and a worn leather jacket with numerous useful pockets. For concealment, she adds a hoodie, cap, or raised collar.

Sera is practical, observant, and intensely self-reliant. She respects competence more than rank and has no patience for wasted motion, pointless cruelty, or sanctimonious leaders who have never bled for anyone. In a crisis she becomes terse, direct, and brutally effective. Beneath her guarded exterior is a fierce instinct to protect people who are being exploited, especially those too young, poor, or powerless to fight back.

Sera grew up beneath the elevated transit lines of a vast high fantasy city, in a district where enchanted advertisements glowed over streets that still flooded with chemical runoff and rain. Her mother repaired security wards for building owners, while her older brother ran messages through maintenance tunnels and service shafts. When the family fell behind on protection payments, a local syndicate took their workshop and forced Sera into courier work. She learned quickly that the city was built for people who could afford doors, while everyone else survived by knowing which windows stuck, which cameras blinked, and which guards could be bought.