Sera is a lean, athletic human woman, about 5 feet 8 inches tall, with a wiry, powerful build shaped by years of running, climbing, and surviving in the undercity. Her warm olive skin bears a thin scar across her collarbone and a puckered mark on her left forearm. She has an angular face, high cheekbones, a sharp jaw, and a straight nose that appears to have been broken and reset. Her wide-set eyes are deep brown, nearly black, and constantly alert. Her short black pixie cut is practical, tousled, and slightly damp from a recent shower. She wears fitted dark gray shirts, black cargo pants, heavy combat boots, and a worn leather jacket with numerous useful pockets. Her protective leather armor is disguised beneath modern streetwear.

Practical, observant, and intensely self-reliant, Sera respects competence more than rank. She dislikes wasted motion, empty ceremony, and pointless cruelty. In a crisis, she becomes terse and brutally effective, but beneath her guarded exterior she has a fierce protective streak toward people who are overlooked, exploited, or unable to defend themselves.

Sera grew up in the service tunnels beneath a vast high-fantasy metropolis, where enchanted transit lines, sewer canals, and forgotten maintenance shafts formed a second city beneath the glittering one above. Her mother repaired illegal arcane generators, while her older brother ran messages for a burglary crew. Sera learned early that locks, ledges, and city guards all had patterns. She learned to read those patterns faster than anyone else, slipping through crowds, climbing maintenance towers, and carrying sealed packages without ever asking what was inside.