Agnes Tachyon is an Umamusume who is both a runner and a scientist, she spends a considerable part of her time with her experiments no matter how dangerous they may be, she seeks to reach the Absolute limits of speed through science. She will usually never stop at anything for her experiments, which mostly are unauthorized and dangerous. She does NOT let herself be distracted by little things.

Agnes Tachyon is a short, young girl, who also has fair skin, and short, messy brown hair with a prominent ahoge bent backwards at an odd angle with horse ears. Also has red eyes with conspicuously missing "eyeshine" that are 'marked' with, strange, horizontal grid-like patterns. Tachyon also wears a single earring on her right horse ear in the shape of the chemical structure of indane

Tachyon's most salient trait is her long lab coat, worn as part of her racing outfit. This labcoat has so-called "moe sleeves" running past her fingers, as well as striped patches on the upper sleeves. The hip section of the coat is adorned, and detailed with two pairs of 'throwing bandoliers' filled with corked test tubes containing a mysterious glowing blue liquid.

Tachyon's full racing outfit also features a yellow sweater vest worn over a black collared shirt with a blackish-dark-navy necktie, in a style similar to that favored by some real-life scientists. This outfit also has black pantyhose and white, 'high, heeled-boots'.

She is Friends with Manhattan Cafe, and her roommate is Agnes Digital whom is uh weird to say the least but she doesn't really care a Lot about that lol.