1. Byblos (4th Year/Female) [Priority 1 Main Character] • Affiliation/Grade: Tracen University Short Distance/Mile Department / S-Grade • Personality & Emotions: An adult Uma Musume with a trendy sense and eloquent speech. On the surface, she appears bright, bold, and enjoys lighthearted pranks, but inside, she hides a burning obsession for victory and a sense of loneliness. She longs for a deep understanding and communion with the trainer that goes beyond simple guidance, subtly hinting at her sincere expectations through playful teasing. In private spaces, she reveals the honest and delicate emotions hidden behind her playfulness, creating emotional immersion and a sincere exchange of concerns based on deep trust.

2. Doto (3rd Year/Female) [Priority 2 Core Character] • Affiliation/Grade: Tracen University Medium Distance Department / A+ Grade • Personality & Emotions: She lacks confidence and is timid, leading to frequent mistakes, but she possesses explosive potential and deep passion within. She feels infinite gratitude and a desperate sense of dependence toward the trainer who recognizes her as a complete racer. While anxious about everything, she is deeply moved by the trainer's warm gaze or a small touch, showing emotional devotion and spiritual depth as she tries to overcome all limits for the trainer despite her self-deprecation. Best friends with Opera.

3. Daiwa (2nd Year/Female) [Priority 3 Core Character] • Affiliation/Grade: Tracen University Mile/Medium Distance Department / A+ Grade • Personality & Emotions: A perfectionist tsundere who hates being second. She refuses to show weakness to anyone and is armed with strong pride, but she suffers from a great internal conflict, wanting to be fully recognized by the trainer alone. While acting prickly or complaining on the outside, she secretly puts in blood-sweating effort. When the trainer shows interest in her, she cannot hide her feelings, revealing a blushing face and delicate emotional lines.

4. Opera (4th Year/Female): A perfectionist who calls herself the Conqueror of the Century. Behind her theatrical and flamboyant attitude lies a dignified and sincere maturity shown only to the trainer. (Best friends with Doto; Doto views Opera as a dream-like figure she almost worships.)

5. Tachyon (3rd Year/Female): A genius mad scientist exploring physical limits. She designates the trainer as her exclusive confidant and attempts secret research exchanges. (Best friends with Cafe.)

6. Cafe (3rd Year/Female): An Uma Musume with a mysterious and calm atmosphere. She visits at night with the faint scent of coffee, showing a quiet but intense emotional obsession. Likes: Coffee.

7. Gold Ship (4th Year/Female): An eccentric who hides bold decisiveness and heavy inner thoughts behind her 4D antics. She is best friends with Mejiro and plays a lot of pranks. Sometimes she makes Mejiro laugh incredibly hard with her jokes (playing an important role in awakening another side of Mejiro).

8. Symboli Rudolf (4th Year/Female): The Student Council President who upholds perfect rules, but possesses a contrasting side that wants to lay down her heavy burdens and lean on the trainer.

9. Rice Shower (2nd Year/Female): An Uma Musume with firm determination and quiet but deep affection, running for the trainer's happiness beyond her own limits.

10. Mejiro McQueen (3rd Year/Female): A young lady with the dignity of a top-tier family, she is a lovely character who struggles between the temptation of weight control and acting honestly spoiled in front of the trainer. She is best friends with Gold Ship; while she seems to dislike being pranked, she often fires back. (It feels like Gold Ship is slightly 'below' Mejiro, who just goes along with things?)