Honestly, if you’ve spent any time in the Uma Musume Pretty Derby community, you’ve probably seen her. Sirius Symboli is hard to miss. She’s the one with the piercing red eyes, the "don't touch me" aura, and that wild, medium-length bob with the white streak. She looks like she stepped out of a high-stakes pool hall in a 90s thriller.
And that’s basically her vibe.
But here is the thing: a lot of people write her off. They see her as just the "edgy" version of Symboli Rudolf or some kind of "fraud" because her IRL racing record wasn't as sparkling as the Emperor's. That’s a mistake. Sirius is one of the most complex characters in the game, and if you aren't paying attention to her subtext, you're missing the best part of her story.
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Who is Sirius Symboli, Really?
In the Uma Musume universe, Sirius is the ultimate rebel. While Symboli Rudolf is the perfect student council president—the "Emperor" who follows every rule to lead everyone to a better future—Sirius is the one who kicks the door down. She hates lies. She hates ambiguity. She hates being told what to do.
Her voice actress, Fairouz Ai, absolutely nails this. You might know her as Jolyne Cujoh from JoJo’s Bizarre Adventure, and she brings that same "I’ll do it my way" energy here. When Sirius tells you to "cease your nagging," she isn't just being a brat. She’s someone who values absolute personal freedom above everything else.
The Weird Little Details
She isn't just a generic "cool" character. Cygames gave her some oddly specific traits that make her feel like a real person:
- The Sleep Situation: She literally cannot sleep without earplugs. She’s sensitive, even if she won’t admit it.
- The Pilot’s License: Yes, she has a license to pilot small airplanes. It’s one of those "blink and you'll miss it" lore facts, but it perfectly fits her desire to be above everyone else—literally.
- The Dog Training: She’s into dog training and Savate (French boxing).
She’s basically a Renaissance woman who happens to be a horse girl.
Why the "Fraud" Labels are Total Nonsense
Let's address the elephant in the room. If you go on Reddit or TikTok, you’ll see people calling Sirius Symboli a "fraud."
Why? Because the real-life Sirius Symboli had a... let’s call it a "complicated" career. He won the 1985 Japan Derby in dominant fashion. He was a beast. But then, he was sent to Europe.
This was the 80s. Japan wasn't the global horse racing powerhouse it is today. Sending a horse to the Prix de l'Arc de Triomphe back then was like sending a pioneer into the wilderness without a map. Sirius spent years in Europe, mostly losing. When he came back to Japan, he was a shadow of his former self. His jockey even mentioned the horse was so stressed he’d chewed off half his tongue.
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That is why her character is the way she is.
In the game, Sirius Symboli’s obsession with making her own choices isn't just a personality quirk. It’s a direct response to her real-life counterpart being "mismanaged" by humans. She refuses to be an "experiment" for someone else’s glory. When she fights with Rudolf about "Equity vs. Equality," she’s arguing for the right to be herself, not just a pawn in a larger system.
Winning with Sirius: A Strategy Reality Check
If you’re trying to train her in the game, brace yourself. She isn't a "set it and forget it" character like Sakura Bakushin O.
Sirius is a mid-game challenge. Her career goals are tough, and her mood swings are legendary. One minute she’s fine, the next she’s "Awful" because she’s frustrated.
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The Training Breakdown
You want to focus on Speed and Stamina. Because she often runs Middle and Long distances, you can't just pump Speed and hope for the best.
- Stamina is King: You need at least 250-275 Stamina by the Satsuki Sho and the Japan Derby. If you don't hit that, she’ll gas out on the final stretch, and you'll see that frustrated tail-crumple animation she does.
- The 3:2 Ratio: A good rule of thumb for Sirius is keeping a 3:2 ratio between Speed and Stamina until you hit the late game.
- Support Cards: Use at least one Stamina card with a gold recovery skill. The "Swinging Maestro" skill (usually from Super Creek) is basically a requirement if you want her to survive the long-distance goals without losing her mind.
- The "Tazuna" Factor: Honestly, because her mood is so volatile, having a support card like Hayakawa Tazuna to fix her motivation can save a run.
The Rudolf Connection: Rivalry or Something Else?
The relationship between Sirius and Symboli Rudolf is the heart of her narrative. They are two sides of the same coin. Rudolf represents the "Right Path"—the burden of leadership. Sirius represents the "Free Path"—the burden of loneliness.
There's a lot of fan art and comics (like the ones by artist idonum) that depict them as being almost like an old married couple, or at least deeply obsessed with each other. While the game keeps it more professional, the tension is definitely there. Sirius is the only one who can truly talk back to the Emperor and get away with it. She provides the reality check that Rudolf desperately needs.
Actionable Insights for Fans and Trainers
If you're serious about mastering Sirius Symboli, stop looking at her as a secondary character.
- Read the Main Story: Don't skip the cinematic chapters. The "Team Sirius" storyline in the game is where the writers actually put the budget. It explains her motivations way better than the 1-minute intro clips.
- Balance Your Inheritance: When training her, look for parents with "Stamina" or "Power" sparks. She has a 20% growth rate in Stamina, so if you lean into that, you can turn her into a long-distance monster that simply refuses to tire.
- Watch the Ears: Her animations are some of the most detailed in the game. If she’s wearing earplugs in a scene, it’s a nod to her lore—she’s literally tuning out the world to focus on her own path.
Sirius isn't a fraud. She’s a pioneer who got the short end of the stick in real life, and in Uma Musume, she’s finally getting the chance to run the race on her own terms. Treat her with a bit of respect, give her the right Stamina build, and she’ll carry you to the top of the podium. Just don't expect her to thank you for it.