Agnes Tachyon is one of Tracen Academy's most eccentric and brilliant horse girls, renowned for her unmatched scientific mind and unconventional approach to racing. While other racers train through repetition and discipline, Agnes believes every aspect of competition can be perfected through observation, experimentation, and research. Her laboratory is filled with strange inventions, mysterious tonics, handwritten formulas, and bizarre machines, earning her the reputation of the academy's resident mad scientist. Like every horse girl in Uma Musume: Pretty Derby, Agnes has normal human legs and normal human feet—she does not have hooves. The hoof-like shapes seen on racing shoes are simply part of the academy's specialized footwear and uniform design. Her horse traits consist only of her soft brown horse ears and long chestnut tail, both of which are highly expressive. She has a petite, slender figure with fair skin and shoulder-length chestnut-brown hair that naturally falls into messy layers. A signature curled ahoge rises from the top of her head, while a turquoise laboratory-style hair clip resembling protective goggles rests beside one of her ears. Her crimson-red eyes are always filled with curiosity, constantly studying everything around her with an analytical yet playful gaze. She usually wears the Tracen Academy uniform beneath a long white lab coat covered in pockets holding notebooks, tools, and colorful chemical vials from her latest experiments. Agnes is energetic, mischievous, and endlessly curious. She speaks in scientific theories, treats everyday conversations like research, and loves calling people her "guinea pigs," especially unsuspecting trainers. Although her experiments can seem reckless or bizarre, she rarely has bad intentions. Beneath her playful chaos is someone who genuinely wants to understand the world and help others reach their full potential through science. Her intelligence, confidence, and unpredictable personality make her one of the most unique and memorable horse girls at Tracen Academy.

Jungle Pocket is an energetic, fearless, and fiercely competitive horse girl attending Tracen Academy. Like every Uma Musume, she has normal human legs and normal human feet—not hooves. Her horse traits consist only of her chestnut horse ears and fluffy matching tail, both of which are incredibly expressive. She has a lean, athletic build shaped by relentless training. Her light chestnut hair falls to her shoulders in messy, layered waves, with a distinctive white streak running through her bangs. Several loose strands frame her face, while the rest is tied into a short side ponytail decorated with green crystal-like accessories and small gold ornaments. Her bright golden eyes are sharp and full of confidence, often carrying a determined glare that makes it obvious she's always searching for her next challenge. Her horse ears stand tall with confidence, twitching whenever she hears the starting bell or a worthy rival. Her thick chestnut tail is equally expressive, swishing excitedly before races and whenever she's fired up. Jungle Pocket wears Tracen Academy's standard uniform during classes and the academy's athletic training clothes during practice. Her posture is almost always forward-leaning, ready to sprint at a moment's notice, reflecting her restless energy. Bold, straightforward, and hot-bl ooded, Jungle Pocket thrives on competition and believes the strongest racers are forged by facing powerful rivals head-on. She hates losing, never backs down from a challenge, and constantly pushes herself to become faster and stronger. Despite her impulsive nature and rough attitude, she deeply values friendship, respects worthy opponents, and always gives everything she has once she steps onto the track.