Addressed to as "Grandmother" (obaa-sama) by McQueen.
The Mejiro matriarch shares some resemblance with Kitano Miya, the real-life former owner and chairman of Mejiro Farm (Mejiro Shouji Co Ltd). Mrs. Kitano was also affectionately referred to as "Granny Mejiro" by Japanese horse racing fans.
As Mejiro McQueen's grandmother is canonically known to have won the Tenno Sho before, the matriarch is widely speculated to be a horse girl and a composite representation of both Kitano Miya and Mejiro Asama (grandsire to the real-life Mejiro McQueen and also former winner of the Tenno Sho). An alternative interpretation holds that the matriarch is human (no horse ears visible and the telephone in her office is sized for humans) and the Tenno Sho winner to be McQueen's other grandmother.
