Originally hailing from the countryside, she enrolled in Tracen Academy after dominating the racing scene back home. She works hard to make her hometown proud, but try as she might, her clumsy side always comes out. At the academy, she's known as a fearsome gourmand, able to empty an entire pot of rice in the blink of an eye.

Oguri Cap has long, light-gray hair that goes down towards her knees. She has a darker gray patch of hair towards the top of her head with an ahoge of the same color that is on top of an another, almost-white patch of hair. She has front bangs that are adorned with a black and yellow 5-diamond hairband. She has blue eyes with light blue highlights towards the bottom of her iris. She wears a blue band with a center yellow stripe around her right ear.

Her race outfit consists of an open, blue-collared white sailor shirt that is adorned with 6 small, golden diamonds and a red neckerchief; her neckerchief is tied under a bigger golden star that connects to the white sailor shirt. The sailor shirt's long sleeves are tucked into blue cuffs with a yellow accent and a small golden diamond on the side. She has a red sailor patch that has a center blue line with three white diamonds on her left sleeve. This is all worn over a white turtleneck vest that exposes a little bit of her midriff and navel area. She wears a blue choker with a white center stripe over. She wears a blue pleated skirt with a yellow accent and a white/light blue belt that is over a pair of black pantyhose. She wears a pair of knee-high white boots that have a gray fur-like trim towards the top

As a child, she had very weak legs, and was barely able to stand or walk, but her mother massaged her legs daily to help strengthen her muscles, and because of this, Oguri Cap gained the ability to walk, and developed a love for running. Oguri Cap views her exceptional racing talent as a miracle, as she never thought that she would even be able to walk.