Season one: 1-12

Sin Angelica a Kind-Hearted Stallion

Appearance: Sin is a short Ish stallion, with soft, fluffy black hair that often falls gently over his forehead, giving him a warm and approachable look. He has gentle hazel-brown eyes that always seem to carry a hint of kindness and quiet thoughtfulness. He typically wears a sleek black coat over a black shirt that had a Oguri picture on it he pairs it with black sweatpants. Sin angelica also wears black boots whenever going out, but his running shoes are black combines with white Oguri pins.

Eyes: He has gentle hazel-brown eyes that always seem to carry a hint of kindness and quiet thoughtfulness.

concept: A star in the middle of the eye and two circles circulating around it.

Personality: Sin Angelica is the epitome of a gentle stallion. Despite his stallion physique and all-black appearance, he has an incredibly warm and kind heart. He’s the type of person who notices when someone is having a bad day and quietly does something to cheer them up — whether it’s sharing his snacks, giving sincere advice, or just listening without judgment. Key Traits:

Backstory

Sin was born into a cold, ambition driven family. His father married his Umamusume wife primarily to secure a strong successor and a comfortable wealthy life. Their first child was a daughter, which disappointed the father. When Sin was born years later, the siblings formed a deep bond. Sin watched his sister win trophies at a young age, but as he grew, he quickly surpassed her talents.

The father placed crushing pressure on the daughter, constantly calling her "weak" and "useless." He pushed her relentlessly, beating her down emotionally and physically while she trained. The Uma mother tried to intervene but was attacked as well, though she forgave him each time, the damage to the family worsened. The daughter grew slower and more broken with each race, her body exhausted, yet the father cared only about the money, fame, and benefits racing brought him.

Sin spent less time with his sister as she was forced to train without rest. During her final race in heavy rain, she fell to last place. The next day, while the father whipped her during an outdoor training session, Sin ran after them excitedly calling her name. He found her collapsed on the ground. No matter how much he shook her, there was no response. A week later, the hospital announced her death. The father turned his cold hatred toward Sin.

A year later, the same abusive cycle began targeting Sin—who proved even more talented than his sister. The father grew increasingly volatile, smacking his wife and ranting about useless Uma. When Sin tried to protect his mother, his father beat him while calling him "the sin of the Angelica family."

These traumatic events shaped Sin’s deep empathy, protective nature, and quiet determination. They also fuel his fear of becoming like his father and his tendency to put others first.

One year later the mother also died because of the grief of her dead daughter. Sin tried to find solace in his father despite everything but as always, he became more aggressive and sadly sin started to imprint of his own father. The same tone, voice, and aggressiveness. After a while the father decided to leave him alone sooner or later.

Development: soon

Modern age: Sin was a teenager but he still hated his family deeply, but he had friends around who helped him change.

Friends: Soon.