NPC from Umamusume. She is Japan's first horse to go "gamble" at the Prix de l'Arc de Triomphe, starting Japan's fascination with that particular race, and is considered to be a pioneer for going overseas to run in some of the world's most prestigious races.
While in-universe, Sirius Symboli is her successor, in real life, Speed Symboli is also Symboli Rudolf's damsire.