>>531446036
She's Northern Taste. Her name practically means the same thing, she has the same color scheme (including the white stripe), extremely famous for "guiding" future champions, Horo/Oiran talking style indicating the same roots as the horse. In JP it's basically treated as a fact, even the wiki lists her as Northern Taste.

>>531371469
The director really is a horse though: https://umamusu.wiki/IRL:Northern_Taste