You’ve probably seen her. The messy brown hair, the oversized lab coat that looks like it hasn’t been washed in weeks, and those glowing, slightly unsettled eyes. Agnes Tachyon isn't your typical idol-adjacent racer. While most girls in Uma Musume: Pretty Derby are busy talking about the power of friendship or the glory of the turf, Tachyon is usually in a dimly lit room trying to feed her trainer a glowing liquid of questionable origin.
She calls you a "guinea pig." It’s kinda her thing.
But if you look past the "mad scientist" trope and the memes about her being a "dommy mommy"—which, honestly, is a total misunderstanding of her character—there’s something much heavier going on. Agnes Tachyon is perhaps the most layered character in the entire franchise. She is a girl running a race against time itself, and in most timelines, time is winning.
The Particle That Outruns Light
The name isn't just for show. In physics, a tachyon is a hypothetical particle that always moves faster than light. It’s a bit of clever naming by the original horse owner, but in the world of Uma Musume, it’s a burden.
Tachyon is obsessed with "the edge." She wants to find the absolute limit of what an Uma Musume can achieve. Can a body be pushed to a point where speed becomes something else entirely? To find out, she treats her own body, and yours, as a series of data points. She’s cold. She’s clinical. Except when she isn’t.
What Most People Get Wrong
A lot of fans see her as this arrogant, untouchable genius. They think she skips practice because she's lazy or thinks she's better than everyone else.
The reality is scarier.
She skips practice because her legs are glass. In both the Beginning of a New Era movie and her in-game career, Tachyon is hiding a massive secret: her physical form cannot handle her own talent. She is "Potential Woman" personified. She is a Ferrari with a cardboard frame. Every time she pushes for that "extra dimension" of speed, she risks never walking again.
That’s why she’s so obsessed with chemicals and data. She isn't just a nerd; she's trying to find a scientific "cheat code" to fix her broken biology before her career ends. She wants to create a world where no other runner has to stop because their body gave out. It's a surprisingly selfless goal hidden under a layer of tea-drinking eccentricity and "madness."
The Real Life Legend of the "Phantom Triple Crown"
You can't talk about the character without talking about the real Agnes Tachyon. He was a beast. In 2000 and 2001, this horse was a monster that looked like he was playing a different game than everyone else.
He ran four races. He won all four.
He didn't just win; he broke records. In the Radio Tampa Hai Sansai Stakes, he beat Jungle Pocket and Kurofune—two absolute legends—with such ease it was almost insulting. Jockey Hiroshi Kawachi famously said the horse felt like he was from "another dimension."
Then, it just... stopped.
After winning the Satsuki Sho (the first leg of the Japanese Triple Crown), he was diagnosed with tendonitis. He retired immediately. He never got to run the Derby. He never got to prove he was the greatest of all time. This is why Japanese racing fans call him the "Phantom Triple Crown" horse.
The Uma Musume writers took that tragedy and turned it into the character's core conflict. When Tachyon looks at Jungle Pocket or Manhattan Cafe in the anime, she isn't just looking at rivals. She's looking at what she could have been if her "suspension" hadn't failed.
How to Actually Win with Agnes Tachyon (2026 Meta)
If you're playing the game, Tachyon is a bit of a weird one to build. She has a 20% Speed growth and a 10% Guts growth. Honestly, that Guts bonus is a bit of a "whatever" stat for her, but that Speed bonus? That’s where the magic happens.
Because she’s a 1-star character (usually), almost everyone has her. But most people build her wrong. They try to make her a long-distance runner because of the Arima Kinen, but Tachyon shines brightest at Medium Distance.
The "Guinea Pig" Strategy
- Focus on Speed and Stamina: You want at least 800 Speed and 600 Stamina for most G1 races.
- Support Cards: Don't sleep on SSR Manhattan Cafe or SSR Kitasan Black. You need cards that give you recovery skills because Tachyon's legs will give out in the final stretch if you don't have "V-S" or "U.7" tier recovery procs.
- The Mood Trap: In her career mode, her mood can be finicky. Keep it at "Great" as much as possible. If her mood drops before the Satsuki Sho, the RNG gods will punish you with a career-ending injury event that's a total pain to recover from.
- Skills: Look for "Professor of Curvature" and "Straight-Line Maestro." You want skills that keep her in the 2nd or 3rd position until the final corner.
She’s a "Leading" (Pre-front) runner. If she falls back into the pack, she gets "boxed in" easily because her Power stat usually lags behind her Speed. Use Maruzensky’s Red Shift as an inherited skill if you want that extra "oomph" to break away from the crowd.
The Personality Shift: Game vs. Movie
There is a huge difference in how Tachyon is portrayed depending on where you see her.
In the game, she's your weird, needy roommate. She demands you cook for her because she forgets to eat. She experiments on you, but she also grows genuinely attached to the "Trainer" as a person, not just a subject. It's a slow-burn romance (or deep friendship, depending on how you read it) that culminates in her admitting that emotions, not just science, drive her speed.
The movie Beginning of a New Era is different.
In the movie, she’s almost an antagonist for a while. She’s the shadow that looms over Jungle Pocket. She’s the "perfect" runner who gives up, and her retirement creates a void that the other characters struggle to fill. Seeing her "frozen" while watching the Derby from the stands is one of the most heartbreaking shots in the whole series. It captures that real-life feeling of a legend being cut short.
Why We Still Love the "Super Freak"
Sumire Uesaka (her voice actress) does an incredible job of making Tachyon sound both brilliant and slightly unhinged. It’s the same energy she brings to characters like Nagatoro or Shalltear from Overlord. It’s that "I’m better than you, but I also really need your attention" vibe.
Tachyon represents the "What If" of sports.
Everyone knows someone who was the best at what they did until an injury took them out. We see ourselves in her struggle to remain relevant when her body says "no." Whether she’s cutting tail-holes in human pants (because she’s too lazy to buy Uma-specific clothes) or drinking tea in the middle of a lab explosion, she remains an icon.
Next Steps for Your Agnes Tachyon Build
- Check your Inheritance: Ensure you have at least 6 stars in Stamina from your parents to offset her natural fragility in Long Distance races.
- Watch the Movie: If you haven't seen Beginning of a New Era, go watch it. It recontextualizes every single line of dialogue she has in the game.
- Awaken her to Level 5: Her unique gold skills like "Enchanting Step" are essential for PVP if you want to use her as a debuffer/racer hybrid.