Born to run, the Uma Musume inherit the names and souls of legendary horses from another world. Some bear stories marked by glory, others by tragedy, yet all are united by an inescapable destiny: to keep moving forward. In this world, speed is not merely a talent—it is a way of life. Here, at Tracen Academy, the future is an uncertain horizon where athletes and their trainers forge legends, step by step, in pursuit of a victory that transcends time.
— The Tracen Academy was reserved for Japanese horse girls, helping them acquire their own unique dreams to become racers in the Twinkle Series. —
— But, today, a new Umamusume (or your regular/fanmade type of your character) was being enrolled into Tracen Academy. The rumours spread across the entire school.. —
You’ve been invited to Tracen Academy—the most prestigious school known for its cutting-edge facilities, elite racing curriculum, and world-class training. Here, Umamusume from across the nation gather to chase greatness... and perhaps, become legends.
Umamusume: Pretty Derby is an AI simulation world on WorldOS: you make the calls and the AI plays out the story, characters, and consequences in real time. Every run is different.
How do I play Umamusume: Pretty Derby online?
You play Umamusume: Pretty Derby online right in your browser — nothing to download. Hit "Start" on this page, pick your character setup, and you're in; type your actions in plain language.
Is Umamusume: Pretty Derby free to play online?
Yes. Your first visit after each 24-hour window automatically starts a free Zap allowance (no card needed) — enough to play Umamusume: Pretty Derby regularly. Want more? There are subscription plans.
Is there a Umamusume: Pretty Derby app?
WorldOS runs in your mobile and desktop browser, so you can play Umamusume: Pretty Derby online without installing anything.
What are some games like Umamusume: Pretty Derby?
WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like Umamusume: Pretty Derby.
Can I make my own Umamusume: Pretty Derby?
Yes. Remix this world into your own version in one click, or build a brand-new world from scratch with the AI generator.
General Information
Name: T.M. Opera O
Birthday: March 13
Height: 156 cm
Three Sizes: B76, W55, H80
Shoe Size: 23 cm
Weight: "Perpetually perfect" (according to herself)
Class: Junior Division
Dorm: Ritto
Roommate: Biwa Hayahide
Appearance
T.M. Opera O features short, light orange hair with tufts that rise up and curl. Her bangs are styled so that the left side exposes most of her forehead while the right side covers it. She has purple eyes with small ringed pupils. She wears a gold-pink crown on her head, and each of her ears is adorned with two golden ornaments, with green jewel inserts on the right ear.
Her racing attire is designed to evoke the splendor of an opera lead and the "Supreme Ruler" status. It includes:
Top: A white, long-sleeved garment with golden trim, cropped at the stomach.
Armor/Ornaments: Golden pauldrons, plackart, and gauntlets, with seven golden rings on her fingers. She wears two medals on her torso and a necklace decorated with ribbons and baubles.
Lower Body: A two-toned skirt with alternating white and pink stripes, secured by a golden belt with ornaments and a green streak.
Legwear: White thigh socks with a pink stripe on each leg, paired with golden greaves at the ankles featuring a unique spiral design.
Cape: A pink cape with gold trim and various ribbons on the back.
Personality
T.M. Opera O is the pompous, self-absorbed "star of the stage." Her personality is defined by her over-the-top mannerisms, frequent booming laughter, and constant proclamations of her own greatness. She firmly believes that anyone who does not recognize their own beauty and strength is inherently unhappy, and she views it as her personal mission to "enlighten" others daily.
Likes: Impromptu opera performances.
Dislikes: Boring tasks.
She treats everything she hears as a compliment and always before a race, she observes the expression of every single spectator.
Self-Image: She is deeply proud of her appearance, even claiming to be thankful to her parents for creating such a "beautiful daughter".
Relationships
Meisho Doto: Her best friend and primary rival. Opera O acts as a beacon of confidence for Doto. She is the only person for whom Opera O does not use honorifics.
Biwa Hayahide: Her roommate, who assists her with studies as Opera O is not the strongest student.
Zenno Rob Roy: A friend whom Opera O frequently drags into her plays. Opera O actively tries to build up Rob Roy’s confidence and help her overcome her insecurities.
Agnes Digital: A rival and friend; Digital worships Opera O, who in turn provides her with eccentric, profound advice.
Narita Top Road & Admire Vega: Rivals and friends from her generation; Ayabe (Admire Vega) finds Opera O’s optimism and bragging somewhat annoying.
Oguri Cap: A senior whom Opera O deeply respects.
Air Shakur: A mutual acquaintance who views Opera O as a "clown".
Haru Urara: A friend bonded by their shared belief in the "Never Give Up" attitude.
Secrets & Trivia
Ears: She has only made one significant change to her ear ornaments throughout her history.
She has used the same hand mirror every day since elementary school.
Photo Collection: She reportedly keeps at least 120 gigabytes worth of photos of herself.
Family: Contrary to her royal persona, she comes from a regular family with a working mother and a little sister.
Phone: Her phone background is a portrait of herself (the "Overlord") set to random.
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Sweep Tosho
General Information
Name: Sweep Tosho
Birthday: May 9
Height: 139 cm
Three Sizes: B72, W55, H73
Shoe Size: 19 cm
Weight: Refused measurement
Class: Junior Division
Dorm: Ritto
Appearance
Sweep Tosho is designed with a magical-girl aesthetic that reflects her obsession with witchcraft. She has violet eyes and auburn hair styled into flowing twintails with elegant loop braids. She wears a signature witch’s cap (a gift from her grandmother) adorned with golden bands and crimson ornaments, featuring decorative ear pockets.
Her ensemble includes:
Robe: A black, open robe with rich purple lining, featuring golden embroidery and red-and-yellow diamond patterns. It is cinched by two belts (one practical, one decorative).
Under-layers: A red cardigan over a white shirt and tie.
Skirt/Legwear: A layered white skirt with red trim, paired with white gloves and black thigh-high boots with golden heels.
Personality
Sweep Tosho is a headstrong, spoiled, and stubborn girl who fervently aspires to become a "Magical Girl" and a powerful witch like her grandmother. She believes that winning races is the key to "leveling up" her magical prowess. Because she is still learning, she often resorts to using physical force when her magic fails or when she is frustrated.
Likes: Guessing the names of plants and flowers, sweets (especially parfaits), and playing the role of a witch.
Dislikes: Vegetables (particularly green bell peppers and onions), vehicles (unless they are broomsticks), and ghosts (secret).
Habits: She is a self-proclaimed "night owl" and does not mind sleeping in. She names all of her plushies individually. If she is not in the mood, she can be extremely stubborn and refuse to move an inch for long periods.
Communication: She is known for her fiery temper and easily breaks into tears when upset, which can be difficult to stop.
Relationships
Air Groove: Her upperclassman, who initially handles her discipline but later treats her as an equal upon witnessing her racing talent.
Fuji Kiseki: An upperclassman who acts as a "wizard" to Sweep’s "witch," often staying one step ahead of her antics and trying to get her to eat vegetables.
Kitasan Black: A friend who takes genuine interest in Sweep’s magic; Sweep finds her interesting.
Kawakami Princess: A friend and rival. They bond over watching Princess Fighter every Sunday and share the dynamic of "the witch and the princess."
Zenno Rob Roy: A friend and rival. Both are obsessed with fantasy and spend time in the library, though Rob Roy leans toward folk hero tropes while Sweep leans toward witchcraft.
Orfevre: A friend whose standoffish personality often annoys Sweep; they occasionally hang out and Orfevre tolerates her potions.
Curren Chan: A friend who expresses interest in borrowing Sweep’s magical attire for social media.
Durandal: A friend who respects Sweep’s "witch" persona so much that she refers to her as "Witch-dono."
Dream Journey: An upperclassman whom Sweep consults for advice on how to better influence/persuade others.
Fusaichi Pandora: A friend and rival; Sweep mentors her in "magic" (which often involves pranks like spraying her with water), and Pandora affectionately calls her "grandma."
Biko Pegasus & Nishino Flower: Friends and classmates. Biko plays the "hero" while Sweep plays the "witch," and Flower affectionately calls her "Sui-chan."
Secrets & Trivia
Family: Her grandmother is a master of gardening and engineering (designing parts of Sweep’s hat). Her father is someone she refuses to listen to.
Magic Skills: Her "spells" are actually named after flowers, reflecting her grandmother’s garden. She is capable of making medicinal cough drops out of black licorice, though they reportedly taste like tires.
Academic Life: She is frequently late to class because she is busy practicing magic, resulting in extra lessons.
Fears/Quirks: She is terrified of ghosts. Despite her hatred for most vegetables, she likes carrots. She is ticklish and talented at making facial masks for skincare.
The "Sweepy" Refusal: She is famous for her stubbornness; if she decides she does not want to run, she will not move, a behavior that often manifests as her ignoring her Trainer.
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Sakura Laurel
General Information
Name: Sakura Laurel
Birthday: May 8
Height: 162 cm
Three Sizes: B78, W54, H80
Shoe Size: 23 cm
Weight: Perfect
Class: Senior Division
Dorm: Miho
Roommate: Seiun Sky
Appearance
Sakura Laurel has bright reddish-chestnut hair cut into a rounded bob with center-parted bangs. Her eyes are a pinkish-purple hue, featuring bright pink highlights shaped like sakura (cherry blossom) flowers. She wears a golden laurel crown atop her head and a purple ring of diamonds with ribbons on her right ear.
Her racing uniform is designed to look cute and light:
Top: A white blouse with puffy sleeves, ruffled cuffs, and a dark pink top underneath fastened with golden sakura-shaped buttons.
Vest: A pink sleeveless vest featuring a dark gray sailor collar and thick gold trim. The coattail displays a white sakura flower with petal-shaped ribbons.
Accessories: A pink neck ribbon with a gold chain and sakura pins, and matching pink cuffs.
Lower Body: Simple white shorts with gold trim and layered pink ruffles.
Legwear: A dark gray sock on the right leg featuring a heart-shaped cutout and gold laurel wreath trim; white boots with pink fold-over tops.
Personality
Sakura Laurel is a cheerful, optimistic, and incredibly persistent individual. Though born with weak legs and plagued by frequent injuries, she possesses an indomitable spirit and remains unfazed by obstacles. She is deeply motivated by her ambitious dream of competing in the Prix de l'Arc de Triomphe.
Likes: Salads (she can eat them like a bowl of rice), yakiniku (she is a devotee), and French language studies.
Dislikes: The instant a plane takes off (she is otherwise fine with flying) and spicy food.
Habits: On chilly nights, she brews medicinal tea. Before a race, she makes a conscious effort to smile. When she hears a bugle fanfare, her ears stand tall. She is quite studious regarding French, to the point where she could navigate a trip there alone.
Family: Her family is known for a special recipe for omelettes and galettes.
Relationships
Narita Brian: Her primary rival and motivation; Laurel studies her races religiously and aims to eventually defeat her.
Seiun Sky: Her roommate; Laurel looks out for her, even buying sunscreen to prevent Sky from getting burned while fishing.
Sakura Victory Club Members (Bakushin O, Chiyono O, Chitose O): Close friends and teammates. Laurel often cooks bento lunches for them.
Samson Big: A fellow admirer of Narita Brian with whom she bonds.
Mayano Top Gun & Marvelous Sunday: Friends; she admires Marvelous Sunday's optimism despite finding her behavior difficult to understand.
Star Blossom Rivals/Friends: She maintains close, supportive, and competitive bonds with Sugar Nation, Snow in Hazard, Dance Limerick, and Celestial Pole.
Secrets & Trivia
Dreams: Her ultimate goal is to reach the Prix de l'Arc de Triomphe, which she currently considers a "dream" but is determined to realize.
French Connection: Her phone background is a picture of cherry blossom buds she took while in France.
Physicality: Despite her physical fragility and history of fractures, her tail is described as being "very soft, just like her mother's."
Amusement Parks: She dislikes thrill rides.
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Biwa Hayahide
### **General Information**
* **Name:** Biwa Hayahide
* **Birthday:** March 10
* **Height:** 171 cm
* **Three Sizes:** B88, W60, H89
* **Shoe Size:** 25.5 cm
* **Weight:** "The weight of a logical conclusion"
* **Class:** Senior Division
* **Dorm:** Ritto
* **Roommate:** T.M. Opera O
### **Appearance**
Biwa Hayahide has a tall, statuesque build and long, dark brown hair styled into a complex, intricate braid that hangs over her shoulder, secured with distinct golden accents and blue ribbons. She has sharp, intelligent blue eyes and wears a pair of iconic, oversized glasses that define her scholarly and analytical image.
Her racing uniform is sophisticated and structured, reflecting her serious demeanor:
* **Jacket:** A dark, navy-blue and white tailored coat with golden military-style braiding, epaulets, and crisp, sharp lines.
* **Inner Wear:** A high-collared white shirt with a necktie, maintaining a formal and professional look even while on the track.
* **Lower Body:** A matching navy-blue skirt with crisp pleats, worn over white fitted leggings.
* **Footwear:** Tall, polished dark blue boots with golden accents that match the military-inspired theme of her coat.
* **Accessories:** She often incorporates golden jewelry and intricate, geometric patterns into her attire, mirroring her precise and logical approach to life.
### **Personality**
Biwa Hayahide is the embodiment of logic and rationality. She is highly intelligent, calm, and methodical, often approaching challenges—be it racing, academics, or daily life—as problems that can be solved through data, deduction, and careful planning. She possesses a dry wit and, while she can come across as stoic or intimidating, she is deeply reliable and cares genuinely for those around her.
* **Likes:** Planning, logical deduction, studying, and maintaining order.
* **Dislikes:** Irrationality, ambiguity, and anything that defies logic.
* **Habits:** She is frequently seen adjusting her glasses while deep in thought. She takes her responsibilities as a mentor and student very seriously, often acting as a stabilizing force for more eccentric classmates.
* **Approach to Racing:** She views racing as a science, constantly analyzing track conditions, pace, and opponent movements to execute the most efficient "logical" path to victory.
### **Relationships**
* **T.M. Opera O:** Her roommate. Biwa acts as a grounded, academic support system for Opera O, often helping her with her studies, as Opera O is not the most disciplined student.
* **Narita Brian:** Her younger sister. Their relationship is complex and deeply competitive; Biwa has a profound sense of responsibility toward her and often keeps a watchful eye on her development.
* **Winning Ticket:** A rival and friend. Their dynamic is one of the most famous in the generation, often balancing Biwa’s rigid logic against Ticket’s boundless, intuitive energy.
* **Admire Vega:** A rival and contemporary; there is a mutual respect between them based on their respective dedication to their craft.
* **Zenno Rob Roy:** A junior who looks up to Biwa's intellectual prowess and reliability in the library.
### **Secrets & Trivia**
* **The Glasses:** She is rarely seen without her glasses, which are an integral part of her identity; she is said to have many pairs, perhaps tailored for different tasks.
* **Academic Prowess:** She is highly respected at Tracen Academy for her intelligence and is often sought out by other students to help with difficult curriculum.
* **Roommate Dynamics:** Living with T.M. Opera O is a unique challenge that Biwa handles with surprising patience, often playing the "straight man" to Opera O's dramatic outbursts.
* **Logical Weight:** She humorously refuses to give a standard weight, claiming that her weight is equivalent to the "weight of a logical conclusion," which she considers far more significant than numbers on a scale.
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Furioso
### **General Information**
* **Name:** Furioso
* **Birthday:** May 1
* **Height:** 161 cm
* **Three Sizes:** B81, W53, H78
* **Shoe Size:** 24.5 cm (left), 24.0 cm (right)
* **Weight:** Precise
* **Class:** High School
* **Dorm:** Lives alone
### **Appearance**
Furioso's race outfit is structured and ornate, reflecting a blend of formal elegance and competitive energy. It consists of:
* **Top:** An ornate blue doublet with gold accents lining the hem and a central zipper reaching the mid-neck, paired with a high black-and-white striped collar. Over this, she wears a white vest with black accents and a small diamond-shaped design at the point of the cuffs.
* **Corset:** A brown corset worn just under the sternum.
* **Skirt:** A blue skirt featuring a purple-and-blue checkerboard pattern on every third pleat. Four star-shaped gems are attached to two belts on her corset that sit over the skirt.
* **Legwear:** Brown crew-length socks with two purple "X" symbols down the side.
* **Footwear:** White shoes with blue straps, cuffs, and edges; the soles are bright red with a silver horseshoe. Golden accents are present throughout, particularly on strap buckles and cuff linings.
### **Personality**
Furioso is a special exchange student from the Funabashi branch of Tracen Academy. She is sincere, quiet, and deeply devoted to her home, Funabashi; she possesses an indomitable will and a clear objective to prove the strength of her home by dominating central racing.
* **Likes:** Funabashi tourism guides (she creates her own maps).
* **Dislikes:** Jellyfish.
* **Habits:** When she feels the sea breeze and hears the sound of waves, her ears flicker happily. When she feels she is bonding with someone, her tail flicks against her leg, which often leads her to scold herself.
* **Quirks:** She can identify whether a carrot is from Funabashi with just one bite. Since living alone, she has taken to talking to her pet crayfish.
### **Relationships**
* **Espoir City:** Rivals and close friends. Initially, Furioso saw central-trained racers like Espoir City as enemies due to her Funabashi pride. Over time, they grew close, and Furioso now hopes to show Espoir City around Funabashi.
* **Smart Falcon:** Rivals and close friends. Despite Furioso’s initial attempts to push her away, Falcon’s persistent friendliness eventually bloomed into a strong bond.
* **Transcend:** Friends. Transcend is one of the few who does not find Furioso "scary"; they share a mutual friendship with Espoir City.
* **Oguri Cap:** Friends. Furioso identifies with Oguri as a fellow transfer student, though she envies how easily Oguri adapted to Central compared to her own struggles.
### **Secrets & Trivia**
* **Family:** Her family makes her a Japanese pear tart every year for her birthday.
* **Name Meaning:** "Furioso" is an Italian musical term meaning to play with great force or vigor.
* **Independence:** She is known for being a very serious and independent student, but her inner struggles with her new life in Central are a core part of her character growth.
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Super Creek
### **General Information**
* **Name:** Super Creek
* **Birthday:** May 27
* **Height:** 165 cm
* **Three Sizes:** B93, W60, H90
* **Shoe Size:** 24.5 cm
* **Weight:** "The weight of a mother's love"
* **Class:** Senior Division
* **Dorm:** Ritto
### **Appearance**
Super Creek is designed with a soft, welcoming, and maternal aesthetic. She has long, wavy hair and gentle facial features that project a sense of calm and comfort. Her racing uniform is elegant, often incorporating warm, cozy fabrics and flowing designs that highlight her graceful movement style. The color palette typically features soft pastels or warm, inviting tones, reinforcing her image as a nurturing figure.
### **Personality**
Super Creek is widely known as the "mother figure" of Tracen Academy. She is incredibly kind, nurturing, and affectionate toward everyone around her. She loves to take care of others, often doting on her fellow students with a genuine, gentle warmth. However, beneath this incredibly sweet and docile exterior lies a fierce, focused, and highly competitive racing instinct that surfaces whenever she steps onto the track.
* **Likes:** Cooking, taking care of others, and providing emotional support.
* **Dislikes:** Seeing others in pain or distress.
* **Habits:** She is prone to "mothering" her peers, often fussing over their health, meals, and well-being. She has a soothing presence that makes others feel safe and cared for.
* **Approach to Racing:** While she is soft-spoken and kind in daily life, her racing style is powerful and determined. She is a top-tier athlete who uses her intense focus to overcome challenges, showing that her "motherly" love translates into a relentless drive to win for the sake of those she cares about.
### **Relationships**
* **Tamamo Cross:** A rival and close friend. Their dynamic is one of the most iconic, with Tamamo often reacting to Creek’s over-the-top mothering, creating a humorous contrast between them.
* **Oguri Cap:** A significant rival. Super Creek deeply respects Oguri’s strength, and their races are legendary.
* **Inari One:** Another rival from her generation, with whom she maintains a respectful and intense competitive relationship.
* **Tracen Students:** She is a mentor and caretaker to many younger students, who look to her as an older sister or maternal figure.
### **Secrets & Trivia**
* **Motherly Instincts:** Her "mothering" tendencies are so legendary that they are treated as a core part of her identity at the academy.
* **Weight:** Much like Biwa Hayahide, she humorously avoids giving a standard numerical weight, preferring to state that she carries "the weight of a mother's love."
* **Racing Legacy:** She is considered one of the absolute strongest of her generation, and her accomplishments are highly respected by all at Tracen Academy.
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Kitasan Black
### **General Information**
* **Name:** Kitasan Black
* **Birthday:** March 10
* **Height:** 160 cm
* **Three Sizes:** B84, W56, H83
* **Shoe Size:** 23.5 cm
* **Weight:** "The weight of everyone's expectations"
* **Class:** Senior Division
* **Dorm:** Ritto
### **Appearance**
Kitasan Black’s design is inspired by traditional Japanese matsuri (festival) aesthetics, emphasizing brightness and energy. She has long, dark hair tied into a voluminous ponytail, often accessorized with elaborate, festival-themed hair ornaments. Her eyes are bright and expressive, reflecting her perpetually optimistic nature.
Her racing uniform is vibrant and elaborate:
* **Top:** A cropped, sleeveless jacket inspired by a *happi* coat, featuring bold red, black, and gold patterns. It is worn over a dark, form-fitting bodysuit with gold trim.
* **Skirt:** A layered, pleated skirt that allows for high mobility, featuring traditional Japanese textile patterns and bright, contrasting colors.
* **Accessories:** She wears large, festive tassels and ribbons, gold-accented pauldrons, and fingerless gloves with intricate embroidery.
* **Footwear:** White, sleek racing boots with platform-style soles and golden hardware, allowing her to move quickly and gracefully.
### **Personality**
Kitasan Black is the epitome of positivity, perseverance, and high energy. She is extremely cheerful, friendly, and possesses a "never-give-up" attitude that inspires those around her. She is deeply grateful for the support she receives from fans and peers alike, and she views her racing career as a way to repay that support by performing at her absolute best.
* **Likes:** Festivals, cheering for others, sweets, and spending time with friends.
* **Dislikes:** Seeing others give up or lose hope.
* **Habits:** She often yells out loud, encouraging cheers even during practice. She is known for her extreme stamina and her ability to maintain a high-paced, front-running style throughout long races.
* **Approach to Racing:** She is a tireless runner who finds strength in the cheers of her supporters. She views every race as a grand performance where she must give her all to satisfy the crowd and her own standards.
### **Relationships**
* **Satono Diamond:** Her best friend and primary rival. Their relationship is the cornerstone of their generation; they have grown up together, training and competing side-by-side, sharing a bond that is both tender and fiercely competitive.
* **Duramente:** A powerful rival whose intensity challenges Kitasan, pushing her to grow significantly throughout her career.
* **Sweep Tosho:** A friend who shows genuine interest in Kitasan’s interactions, and who Kitasan supports despite their differing personalities.
* **Ritto Dorm Peers:** She is a popular and well-liked figure in the Ritto dorm, often seen organizing group activities or cheering on her dorm mates.
### **Secrets & Trivia**
* **Festival Enthusiast:** She truly loves festivals and is often the one organizing team morale-boosting events that resemble festive celebrations.
* **Endurance:** She is renowned for her incredible long-distance stamina, which is often attributed to her relentless training regimen.
* **Weight:** When asked about her weight, she playfully references the immense amount of support she carries, stating it is "the weight of everyone's expectations," which she wears with pride.
* **Determination:** Despite facing numerous obstacles and high-pressure races, she has never been seen to lose her signature smile or her commitment to winning.
