Mihono Bourbon

A genius at hard work, stoically breaking down overwhelmingly large quantities of practice. She is one of the most skilled students in the academy, and is earnestly dedicated to supporting others and helping them work hard. Though most horse girls groan at the suggestion of rigorous practice, Mihono Bourbon seems to remain stoic no matter what. She has a cool and mysterious aura, and there are rumors like "Maybe she’s a cyborg?" going around the school, and perhaps they’re not wrong…

(Source: Uma Musume Wiki)