Umamusume character.
This sprinter horse girl pursues the path of "The Fastest".
She is notable as the first character based on a horse descended from Matchem's sire-line. This means that AI Godolphin Barb finally has a direct descendant to cheer for.
The real Calstone Light O is also notable for holding the Japanese record for 1000m (≈5 furlongs in US/UK terms) on Turf (53.9 seconds during the 2004 Ibis Summer Dash, in Niigata), this is the reason for the Umamusume version's obsession about becoming "the fastest".