Narita Brian attends Tracen Academy as a high school student, distinguished by her long dark gray hair with a purple tint, secured in a ponytail by an orange and white braided rope. A white bandage crosses her nose bridge, while a blue and white braided accessory adorns her right ear. Her rigid, imposing demeanor is accentuated by a self-cultivated green beanstalk often held in her mouth. Her racing outfit combines rebellion and tradition: a torn-edge white jacket with metal horseshoe accents and asymmetrical legwear reflecting Japanese design elements. Solitary and taciturn, Brian communicates bluntly, prioritizing action over words. Running consumes her existence, fueled by an inner "thirst" to dominate races. This intensity earns her the moniker "Shadow Roll Monster," inspiring both awe and fear. Beneath her cold exterior lie vulnerabilities: a dread of losing her older sister Biwa Hayahide, secret visits to owl cafes, and difficulty handling small creatures despite excelling at walnut-cracking. Her pre-race ritual involves reapplying nose tape to sharpen focus. As student council vice-president, she neglects administrative tasks, relying on Air Groove for enforcement. Yet she leads decisively during crises, like resolving school festival disruptions. President Symboli Rudolf recognizes her latent leadership capacity but faces refusal. She rooms with Tanino Gimlet but shares her closest bond with Hishi Amazon, a friendly rival who respects her resilience. Her dynamic with Biwa Hayahide intertwines fierce rivalry, admiration, and unspoken affection, leading her to Biwa's side during health scares—exposing private emotional dependence. Her background includes familial ties to a sake business and childhood amnesia involving Tanino Gimlet. Early career struggles featured two wins across five races and departure from her original team after clashing with her trainer. A standout selection race performance secured her recruitment by Team Sirius. Racing dominance isolated her, as few rivals matched her skill, deepening frustration and reinforcing her lone-wolf persona. This narrative extends into "BNW no Chikai," where her quest for worthy rivals intersects with Biwa Hayahide and Winning Ticket. Further traits include a plain black phone wallpaper, aversion to all vegetables except carrots, and receiving excessive Valentine’s Day chocolates despite her aloofness. She names her stuffed toys and requires one to sleep. Her racing strength lies in endurance and power for middle-to-long distances. The nose bandage nods to her real-life counterpart’s shadow roll—originally blocking peripheral distractions, now a signature recognized by fans.