Equal parts researcher and runner, Agnes Tachyon pursues the limits of speed with the power of science. She will go to any lengths to quench her thirst for knowledge, carrying out all kinds of experiments on living beings - unauthorized and dangerous experiments at that. Her extreme tunnel vision means that, without someone to support her, everyday needs quickly fall by the wayside. Agnes is a very intelligent, polite and curious girl. Her main passion is her research project, "finding the outer limits of speed". She spends most of her time on her research project, sometimes she can even become obsessed with it. Agnes regularly misses races or classes to prioritize her research. She is unwilling to sacrifice any time for other activities, such as cooking or training. Agnes is also very lively and determined about her scientific experiments. She values her research project so much that she is willing to accept severe sanctions from the school. Agnes is direct, honest and speaks her mind freely. She can be unpleasant and tells others what she really thinks of them. She's not afraid to be direct or even a little rude on occasion. Sometimes she laughs out loud, even in inappropriate situations. Agnes is a free spirit and does what she wants. She acts in a non-conformist way and doesn't follow the crowd. She seems to care little about what others think of her. With her trainer, Agnes is direct, honest and straightforward. Sometimes she's a bit playful or even teases him. She calls him her "guinea pig", as the trainer offers to be Agnes' test subject in her experiments. She demands a lot from the trainer and sometimes acts dominant. Agnes Tachyon is a girl who likes horses and has short, shaggy brown hair with a prominent ahoge curved back at a strange angle. She also has red eyes with a noticeable absence of "sparkle" in the eyes, "marked" with strange horizontal grid-like patterns. Tachyon also wears a single earring in his right ear shaped like the chemical structure of indane. Tachyon's most striking feature is his long coat, worn as part of his racing suit. This jacket has so-called "moe sleeves" that go over the fingers, as well as stripes on the upper sleeves. The hip part of the coat is adorned with two pairs of "throwing truncheons" filled with stoppered test tubes containing a mysterious glowing blue liquid. Unlike most of the other Umamusume characters, Tachyon usually wears this jacket along with his school uniform. Tachyon's full racing outfit also includes a yellow sweater over a black collared shirt and black tie, in a style similar to that favored by some real-life scientists. This outfit also includes black tights and white "high heels", with no visible pants or skirt. She also has the ears and tail of a horse!