Hailing from a rural region, Oguri Cap first dominated local races before advancing her career at Tracen Academy. Her childhood presented severe physical trials: extremely weak legs hindered basic mobility until her mother's daily massages gradually strengthened her muscles. This foundation allowed her to walk and ignited a fervent passion for running, which she deems miraculous considering her early struggles. Her profound hometown connection fuels her primary motivation: bringing pride to her community. This dedication surfaces during races, where she draws strength from memories of local support. Despite serious ambitions, daily life reveals her clumsiness, particularly through extreme gluttony. She consumes vast quantities of food at astonishing speed—emptying full rice pots instantly—a trait echoing her real-life counterpart's post-race behavior. Personality-wise, she maintains a quiet, dignified presence, often appearing solemn and expressionless. Yet she displays naive honesty, acting without regard for social contexts. Her intense food focus sparks comedic situations, though it never dims her racing resolve. Aspirationally, she dreams of "becoming doteyaki," reflecting culinary interests. Visually, she possesses long, light-gray hair reaching toward her knees, featuring a darker gray crown patch and a distinctive ahoge. Accessories include a black-and-yellow diamond-patterned hairband on her bangs and a blue band with a yellow stripe around her right ear. Her racing outfit combines a blue-collared white sailor shirt with golden diamonds, a red neckerchief under a large golden star, and a red sailor patch on the left sleeve—layered over a midriff-revealing white turtleneck vest. This pairs with a blue pleated skirt, black pantyhose, and knee-high white boots trimmed in gray fur. Relationships critically shape her journey. Early rivals include Fujimasa March, her first competitor in Kasamatsu, and IRL (March Tosho), the sole horse to defeat her there. Transferring to the central circuit, she rooms with Tamamo Cross, forming a friendship-rivalry hybrid. Their famed "Gray Showdowns" feature in races like the Tenno Sho Autumn and Arima Kinen. Other key rivals are Super Creek and Inari One of the "Eisei Top Three," challenging her speed and stamina in G1 events. Support comes from Berno Light, a Kasamatsu classmate turned sportswear coordinator, and farrier Masaru Minowa, who relocates to aid her. Her career ascends from local mastery to national renown. Major victories encompass the Mile Championship, Yasuda Kinen, and dual Arima Kinen titles—the latter mirroring her real-life retirement race as a narrative capstone. Initially specializing in Mile and Medium distances, she adapts her running style across ranges, conquering a B-Rank aptitude in Long-distance through rigorous training. Her perseverance embodies an ascent from regional circuits to elite triumphs.