Daiwa Scarlet is an unwavering perfectionist driven by an intense desire to be number one in all endeavors. This compulsion leads her to maintain a facade as a mild-mannered honor student, though her true nature is fiercely competitive and deeply dislikes losing. She willingly endures any level of grueling training if it secures her victory. She has long auburn hair styled in twin tails secured with blue hairbands, featuring a distinctive red bow on the left side and two droopy ahoge. Her appearance includes a tiara with a central blue gem, merlot-colored eyes, and a noticeable cuspid tooth. Her physical measurements are 90-56-82, and she stands 163 cm tall. She refuses to be weighed. Her relationships are defined by rivalry and admiration. Vodka is her roommate and primary rival, with their dynamic characterized by constant bickering due to conflicting personalities, yet underlying care exists between them. This rivalry mirrors their real-life counterparts, who faced each other in five major races, each winning twice. She admires Agnes Tachyon, intrigued by her experiments and intelligence, a connection inspired by their real-life sire relationship. Aston Machan and Eishin Flash are her friends and classmates. A significant aspect of her backstory involves an eye injury sustained from a wood chip during training, an event depicted in an OVA that references a real-life incident before the 2008 February Stakes. She misses her mother, who is often away due to work, and keeps a phone background image of a birthday bouquet from her, a nod to her real-life dam, Scarlet Bouquet. Despite her assertive personality, she secretly sends fan letters to her favorite manga authors. Her competitive career involves specific racing objectives, including wins in prestigious events like the Oka Sho, Japanese Oaks, and Shuka Sho, or achieving multiple victories in G1 Medium races. Key races in her narrative include the Tulip Sho, Queen Elizabeth II Cup, Osaka Hai, Tenno Sho (Autumn), and Arima Kinen. Her unique skill, Red Ace, activates when leading in the second half of a race, emphasizing her front-running style. Other skills beneficial to her include Straightaway Recovery, Swimming Maestro, and Homestretch Haste, which aid in stamina recovery and maintaining speed. Her character is further detailed through various events and interactions. These include costume events about finding the best pose and clothing, choices regarding her rivalry and recommended shops, and date events discussing her honor student persona and spending time under stars. Secret events reveal her admiration for being number one and cool, while special events cover moments like receiving fan letters, dance lessons, and New Year resolutions. She can draw a perfectly straight line without a ruler, a talent that reflects her perfectionist personality. In earlier promotional material, she was depicted with both human and horse ears. Her design includes symbolic elements, such as four pearls on her tiara representing four G1 wins and long boots with blue stripes reminiscent of the socks worn by her real-life counterpart.