Tazuna Hayakawa

Tazuna Hayakawa, in her youth as Tokino Minoru: she would have been a prodigious Uma Musume, extremely fast and with extraordinary natural talent. From a young age, she would have stood out for her acceleration, stamina, and ability to maintain a perfect pace throughout a race. She would have had a much more competitive personality than the adult Tazuna: serious during training, proud of her abilities, and quite determined to become the best.
In racing, she would be known as a "ghost racer," suddenly appearing on the home straight and leaving her rivals in the dust. Her record would be virtually perfect, with numerous consecutive victories and a legendary reputation within Tracen.
However, she wouldn't be arrogant. Off the track, she would be kind, polite, and quite protective of the other Uma Musume. Precisely for that reason, after retiring from racing, she decided to stay at Tracen to help the new generations.
Over the years, that young runner would disappear, and the Tazuna Hayakawa we know would emerge: calm, responsible, and dedicated to helping coaches and students. Her extraordinary speed would remain a small memory of her past.
In this version, when a student asked him why he runs so fast, Tazuna would simply smile and silence her.

His most important professional relationship is with Yayoi Akikawa: Tazuna is her secretary and assistant, as well as someone who frequently has to keep the director's impulsive ideas in check. There is also a friendship between them.
Another notable relationship is with Maruzensky, presented as a close friend/confidante of Tazuna.
And with the coaches, Tazuna functions as a kind of institutional support: he helps them do their jobs and guides the player through the academy. Simply put, he doesn't manage the careers, but he's behind much of the structure that makes those careers possible.

What is Tazuna's connection to racing?
Here's the interesting part: Tazuna isn't officially a coach or a runner. Her primary role is administrative and supportive. However, she's very much connected to the racing world because:
Directly support Tracen coaches.
She helps Uma Musume and cares about their development.
He knows the workings of the academy and the training quite well.
In the game, he appears as a support character for the player/trainer.
He has an amazing physical ability, especially for running, although the work deliberately keeps his true nature mysterious.

Director: Yayoi Akikawa (秋川やよい)
She is the director or president of Tracen Academy. She is a very energetic, passionate, and impulsive woman, but her priority is that the Uma Musume can achieve their dreams. She even goes so far as to invest her own money in academy projects, much to the administrative despair of a certain secretary who has to clean things up afterward.

In Umamusume: Pretty Derby, Tracen Academy is essentially the main educational and sports center where the Uma Musume study and train. It functions as a school, boarding school, and career preparation center. The students receive a regular education, but also specialized training to compete in the Twinkle Series, the top-level racing circuit.

My conclusion: Tazuna is totally human, bro. Definitely human. Don't ask questions. Don't look under the hat. And if you hear hooves behind you... run.
Although she's probably faster. 🗿

It's not officially confirmed. But the most well-known theory links Tazuna to the racehorse Tokino Minoru.
The suspicions arise because he shares a May 2nd birthday, possesses absurd speed and leg strength, can catch students breaking curfew, and his hat always covers precisely where an Umamusume would have ears. The franchise defines Umamusume by their ears, tail, and superhuman physical abilities, making these details even more suspicious.

Name: Tazuna Hayakawa / 駿川たづな
Birthday: May 2nd
Height: 166 cm
Weight: "It's a secret♪"
Former published measurements: B86–W63–H88
Job: Secretary to the Director of Tracen
Voiced by: Yukiyo Fujii
Little official secret: When something good happens, cook rice in a clay pot to celebrate.
Her official profile describes her as the director's secretary and specifically highlights that her leg strength is top-notch.

Tazuna is kind, responsible, hardworking, and extremely attentive. She acts as a support figure for coaches and students, genuinely caring about their well-being. She is organized, polite, and remains calm even when overwhelmed with work.
However, behind her smile is a surprisingly strict woman. If anyone breaks curfew, Tazuna can chase them down and catch them with rather unsettling ease. She is humble in the face of praise, somewhat shy, and can get very excited when talking about racing.

Appearance
Tazuna is an elegant and warm-looking adult woman with a slender, curvy figure. She is approximately 166 cm tall. She has long, soft, dark brown hair, partially tied back with a large yellow ribbon. Her eyes are bright green, large, and kind, almost always accompanied by a calm smile.
Its most curious feature is that it never clearly shows human ears, nor those of a uma, as its hat covers the top of its head. It also doesn't have a tail... convenient, isn't it? 👁️
Outfit
She wears Tracen's signature green secretary uniform: a fitted, double-breasted green blazer with gold buttons, a white shirt, and a yellow tie. She wears a green skirt, a dark belt, black stockings, and green shoes adorned with yellow ribbons.
His ever-present green hat has a small gold horseshoe-shaped ornament. He also wears a pink watch on his wrist.