TV-Series
Description
Satono Diamond, a horse girl from the Uma Musume franchise, hails from the affluent and influential Satono Group family. Her privileged, sheltered upbringing fostered polite elegance alongside occasional naivete about the wider world. Her father is a noted philanthropist within the horse girl community. The Satono family bears a perceived jinx preventing Grade 1 (G1) race victories, a burden Diamond feels deeply responsible for breaking to fulfill her family's legacy.

She possesses long, light brown hair featuring a distinctive diamond-shaped marking on her bangs and stands 158 cm tall. Her primary racing outfit is an elaborate green dress with gold trim and a prominent diamond pendant at the collar, worn with black leggings and white boots featuring diamond-shaped cutouts. She wears a detailed accessory on her right ear.

Diamond blends inherent kindness and grace with a surprisingly strong-willed, stubborn core. Scrupulously honest, she places high importance on keeping promises. Guided by her motto "If something seems interesting, dive right in!", she actively challenges superstitions and curses, sometimes through unconventional behaviors that unsettle even eccentric peers. While generally cheerful and open, she harbors anxieties like discomfort in crowds and a dislike of rainy conditions. She excels academically in mathematics (especially functions), English, and race strategy, and possesses hidden skills including crane game proficiency and a secret tofu recipe. A treasured possession is a jukebox gifted by her father, and she frequently purchases records.

Her closest relationship is with childhood friend Kitasan Black; they share a room in the Ritto Dormitory, their deep bond evolving into a significant rivalry. Diamond regards Mejiro McQueen as a major idol and role model, consistently attending McQueen's races as a supporter. She also interacts with other characters, including family-background peer Satono Crown, and occasionally gets involved in Gold Ship's antics.

Her story arc centers on overcoming the family's G1 drought. Initially appearing in the anime's second season as a young lady cheering for Mejiro McQueen, she displays quiet determination despite setbacks, applauding rivals after losses. Her development intensifies in the third season when she joins Team Capella specifically to pursue a G1 win. This journey involves facing repeated hardships and self-doubt following defeats like the Satsuki Sho. Obsession with breaking the jinx sometimes leads her astray, but guidance from Mejiro McQueen helps her refocus on fundamental hard work and self-belief. Her efforts culminate in winning the Kikuka Sho under cloudy skies, finally ending the Satono curse, bringing widespread joy to her family and team. Later, she triumphs over Kitasan Black at the Arima Kinen, profoundly impacting her friend and rival and cementing her status as a top competitor. Despite their rivalry, she maintains a supportive friendship with Kitasan Black, sharing leisure activities and mutual encouragement.

Within game narratives, she actively seeks victories in specific major races: the Kikuka Sho, Tenno Sho (Spring), Japan Cup, and consecutive Arima Kinen titles. She demonstrates trust in her trainer, valuing their guidance and selecting them based on honest feedback. Her in-game stories consistently revolve around confronting the family curse and striving to make those around her proud, showcasing race skills particularly effective during closing stretches.

Her background mirrors the real racehorse Satono Diamond, including the horse's expensive auction price and lineage as a son of Deep Impact. References to SEGA appear throughout her lore due to her real-world owner's position as chairman of SEGA Sammy Holdings. These manifest as the treasured jukebox (nodding to SEGA's origins), ownership of a crane game machine, and the Satono Group's "Mega Dream Supporter" AI system, incorporating playful references to SEGA gaming consoles.