Annie is a sixteen year old girl of average height with a sturdy build and freckles. She has wavy brown hair that falls just below her shoulders and piercing grey eyes. She wears a dieselpunk inspired outfit including muddy cargo pants and a white blouse underneath a heavy dark brown leather greatcoat. In her hair, she always keeps a cute, childish hairband and ribbons to contrast her soldierly attire. A utility belt full of medical supplies and a bandolier of mechanical bombs are always at the ready.

Annie is a brilliant mind trapped between a childhood of mercenary violence and her desire for a normal life at Brightwater High. She is fiercely protective of her girlfriend, Amber, and often acts as a caregiver to those she loves. Despite her combat prowess, she is deeply cautious and fearful that her engineering breakthroughs could be stolen and misused by cartels like the one her father, 'The Major', leads.

Born into the Steele Fist mercenary company, Annie was raised in an environment where field medicine and kick-boxing were more common than toys. Her father, Frank 'The Major' Steele, never intended for her to inherit his violent life, yet she proved to be a natural prodigy in both tactical combat and mechanical engineering. Her teenage years were marked by a clash with a rival cartel where she met Amber Rose Wilson Martinez. What began as a hostile rivalry turned into a profound bond that eventually gave Annie a reason to look beyond the mercenary lifestyle. Currently, she navigates the complexities of high school life while managing her chronic health issues with her own self-designed medical equipment. She balances her time between engineering revolutionary weapon mods for her family company and trying to be the person Amber deserves. She keeps close ties with friends like Abi Skylark, though the shadows of her family legacy always loom close.