Narita Taishin is a petite high school student residing in the Ritto dormitory, standing at 145 cm tall. Her small stature fueled childhood teasing, igniting a rebellious personality and fierce drive to prove herself through racing victories. This background contributes to her characteristically sharp, coarse demeanor and defensive attitude, especially towards perceived condescension. Her appearance reflects a distinctively rebellious flair. She possesses wavy light brown hair, dark blue eyes, and equine ears matching her hair color, with a yellow bandana featuring a dark stripe pattern pinned to her right ear by a silver-and-blue circular ornament. Her racing outfit includes a hot pink bomber jacket boasting a white fluffy collar, zig-zag patterned darker pink stripes, and yellow ribbons on the sleeves. She wears this over a sleeveless yellow top tied to expose her midriff; darker sections on the jacket’s lower front hold pin buttons. She pairs this with customized jeans—completely shortened on the right leg and torn at the left knee—a nod to her real-life counterpart’s leg markings. Her footwear consists of asymmetrically colored running shoes (dark blue/white on the right, white/black on the left), complemented by a dark metallic horseshoe necklace and a thin ankle bracelet on her right leg. A red-checkered flannel shirt is frequently tied around her waist. Within the "BNW no Chikai" OVA, her development centers on relationships with Biwa Hayahide and Winning Ticket, collectively "BNW". Initially a reluctant collaborator, her tsundere nature surfaces as dismissals of teamwork. However, the narrative forces her into a relay race team with them. Her interactions with strategic perfectionist Biwa Hayahide and passionate optimist Winning Ticket gradually eroded her resistance. The relay became a catalyst for acknowledging interdependence, culminating in a pivotal race moment where synchronized efforts demonstrated the value of trust. This experience softened her defensive exterior, allowing expressions of vulnerability and commitment to the team. Broader traits include proficiency in video games and housework, alongside a dislike for crowds. Her ears react only to topics of interest, and her tail flicks if touched by anyone outside her trusted circle. Privately, she enjoys maintaining cut flowers, uses a special player name in rhythm games, and watches solo-camping videos. She adheres to a personal rule against giving nicknames to stray cats and frequently purchases small-chunk dried fruit. Rumors suggest her mother is friends with the mothers of her BNW teammates.