Finding reliable facts about Zenitsu is harder than it should be. Fan sites mix memes with canon, and most articles bury the answer under two paragraphs of plot summary. You want the real height, a clear answer on whether he dies, and the Infinity Castle fight details. This guide gives you every confirmed fact in one place, checked against official sources.
Quick answer: Zenitsu Agatsuma is a 16-year-old Demon Slayer in Koyoharu Gotouge’s Demon Slayer: Kimetsu no Yaiba. He fights with Thunder Breathing, and his one perfect form — the First Form, Thunderclap and Flash — is the fastest human attack in the series. He survives the ending and appears in the final chapter as a father.
Who Is Zenitsu Agatsuma? A Quick Overview
One of the three central slayers of Demon Slayer: Kimetsu no Yaiba (Kimetsu no Yaiba), this 16-year-old crybaby is also the series‘ fastest human. Koyoharu Gotouge introduced him in Chapter 2 of the manga in 2016, and Ufotable brought him to life in the opening episodes of the anime.
On paper, he is a liability. He faints at the sight of a demon, panics at anything sharp, and cries in public without shame. In practice, he is one of the most dangerous humans alive. When fear pushes him unconscious, his body runs at full combat power, and the Thunderclap and Flash he lands while out cold is cleaner and faster than anything the trained slayers can throw at him.
That gap — the crying boy on one side, the lightning-fast fighter on the other — is the engine of his character. It is also the reason the fandom keeps coming back to him, season after season, edit after edit.
The Character Sheet: Every Confirmed Stat at a Glance
The table below pulls every official detail into one place. The stats come from the official Demon Slayer character profile, the manga’s data pages, and Crunchyroll’s character page.
| Field | Detail |
|---|---|
| Full name | Zenitsu Agatsuma (我妻善逸) |
| Species | Human (Demon Slayer) |
| Age | 16 at story start |
| Birthday | February 24 (Pisces) |
| Height | 155.5 cm (about 5 feet 1 inch) |
| Blood type | B |
| Rank | Freshly graduated Demon Slayer (Final Selection batch, 1917) |
| Breathing style | Thunder Breathing |
| Signature technique | First Form: Thunderclap and Flash |
| Nichirin sword color | Yellow |
| Father | Kyuuro Agatsuma (slayer, deceased) |
| Demon Slayer Mark | Yes, awakens in the final battle |
| Voice actor (Japanese) | Hiro Shimono |
| Voice actor (English) | Tyler Walker |
| First appearance | Manga Chapter 2 (2016); opening anime episodes |
| Series | Demon Slayer: Kimetsu no Yaiba, by Koyoharu Gotouge |
Why He Cries, Panics, and Still Wins
The surface read is easy: a crybaby who faints at the first sign of danger. The full picture is sharper.
- A coward in daylight, a genius in the dark: the panic is real, and so is the perfect form that follows it
- A fiercely loyal friend: his love for Tanjiro, Inosuke, and Nezuko is the one part of him that never flinches
- A soft spot for the lost: he cries hardest for his father, for fallen slayers, and for battles that went wrong
- A fast learner under pressure: every arc, his awake self gets a little braver and a little stronger
- An accidental meme legend: the “locked in” version of him is internet shorthand for sudden, total focus
None of it is random. Gotouge built him as a mirror — the part of everyone that wants to hide, paired with a power that only arrives when he stops fighting it.
The Agatsuma Family: Where the Thunder Comes From
His father, Kyuuro Agatsuma, was a Demon Slayer Corps member who carried Thunder Breathing. Kyuuro taught the boy the First Form before he died, and his last wish was simple: master it.
Gotouge gives the father a quiet flashback in the manga, and it shows exactly what the boy spent his whole life trying to answer — a son who could carry the form forward. The boy never could, on his own terms, and the story keeps returning to that debt. Every time the perfect form lands, it is his father’s hand in the strike. That debt is the heart of Zenitsu’s story.
One grounding detail: the surname Agatsuma (我妻) is a real Japanese surname tied to a place name in Nagano Prefecture. The fantasy earns its footing through a name you can actually find on a map.
Thunder Breathing: His One Form, Perfectly Executed
Thunder Breathing is one of the Nine Breathing styles, and every one of them descends from the original Hinokami (Sun) Breathing. The current master of the style is Tengen Uzui, the Sound Hashira. Zenitsu learned his version a different way: from his father, not from the Corps.
He has exactly one form.
- First Form: Thunderclap and Flash (Raigiri). A forward lunge, a single horizontal slash, a visible arc of lightning. That is the whole kit
- Peak output comes while unconscious. Awake and scared, his technique falls apart. Blinded by panic, his body executes the form without error, at full speed
- The anime sells the speed with electric arcs, motion blur, and near-instant travel between frames
So how fast is he, really? The series never gives a number, and a good guide should not invent one. In the story’s logic, the perfect form is the fastest human attack shown — faster than the eye can follow, faster than a demon’s reaction time. The canon gives you a feeling, not a Mach figure. The feeling is lightning.
The Yellow Nichirin Sword
At Final Selection, a slayer’s Nichirin blade takes its final color, and his comes out yellow — matching the lightning of Thunder Breathing. He carries it on his back from the selection mountain to the final battle.
The yellow blade against the green uniform also makes his silhouette easy to read inside the chaos of the Infinity Castle. If you are hunting a “zenitsu sword” image, that yellow-on-green contrast is the signature look: dark hilt, pale gold blade, and a thin electric hum around it in the anime.
Battle Record: From Final Selection to the Infinity Castle
His record is short, brutal, and honest. Here is the full list, arc by arc:
| Story Arc | Who He Fights | How It Ends |
|---|---|---|
| Final Selection (1917) | Demons of the selection mountain | Survives all seven days. One of the very few who pass. Earns the yellow sword |
| First Mission | The demon that attacked the village | Fights alongside Tanjiro. Survives his first real mission |
| Entertainment District | Upper Rank 8, Daki and Gyutaro | Holds the line with the group. Rejoins the fight |
| Swordsmith Village | Upper Rank 4, Hantengu and the split forms | Survives the village. Helps end the threat |
| Infinity Castle (Jukujima) | A fast solo demon, then Muzan Kibutsuji | Beats the solo demon with a perfect form. Fights Muzan in the final battle |
Final Selection is where the character is born. Seven days on the mountain, and he passes out more times than he stays awake. He survives on luck, his father’s training, and the perfect form that fires when he cannot stop it. He walks off the mountain with a yellow sword and a new rank.
The Infinity Castle arc is where it closes. The castle shuffles its floors and separates the group. Zenitsu’s first solo opponent is a fast demon that wounds him in seconds. He panics, blacks out, and the unconscious half of him lands a flawless Thunderclap and Flash that ends the fight. He re-enters the main battlefield and stands with the surviving slayers as they fight Muzan Kibutsuji — this time with his eyes open. The demon slayer Zenitsu was at 16 and the one finishing the series are the same person, which is the entire point of the arc.
The Mark and the Hashira Question
Did Zenitsu get the Demon Slayer Mark? Yes. In the final battle, the Mark of Death — the red pattern that turns a slayer’s body into a weapon — awakens in him along with several other slayers. It raises his ceiling and burns his lifespan. He pays for that power in the endgame.
Does he become a Hashira? No. The story never hands him a Hashira seat, and the Thunder Breathing seat stays with Sound Hashira Tengen Uzui. What he earns instead is different, and in the fandom’s eyes, better: he is one of the last standing slayers in the final battle, a father in the epilogue, and the slayer the fandom remembers for the perfect form.
Tanjiro, Nezuko, and the Rest of His Circle
Tanjiro is the anchor. Zenitsu looks up to him more than anyone in the series, and Tanjiro’s steady kindness is the reason the crybaby kept getting back up. The friendship runs both ways: Tanjiro is the steady one, and his friend is the one who reminds him that fear is allowed.
Nezuko is the question fans actually search for. Does Nezuko like Zenitsu? Canon gives a clear yes as a comrade, and no confirmed romance. She protects him in several scenes and trusts him with her life. The Nezen ship is one of the fandom’s biggest, but the official story never confirms it — and it cannot, because the epilogue shows Nezuko marrying Tanjiro.
Inosuke rounds out the trio. They bicker constantly and respect each other anyway. And the quiet ending belongs to the one person the fandom never expected: his daughter, in the final chapter.
- Tanjiro: the model he is trying to become, and the friend who makes it possible
- Nezuko: a comrade he would shield, a bond that is soft but not romantic in canon
- Inosuke: the bickering third of the trio
- His daughter: the quiet, earned ending
Does He Die? The Ending, Answered
No. He survives the final battle with Muzan Kibutsuji and appears in the series’ last chapter, a few years later, scolding his daughter. For the fandom that searched “did zenitsu die” for three years, the ending is the answer it needed.
Two clarifications for the detail-obsessed:
- He takes heavy damage in the final battle, and the Mark shortens his lifespan. The story acknowledges the cost without killing him
- The death scenes around him belong to other slayers. Sanemi dies in the final battle, and others fall beside him. He walks out alive and stays in the Corps’ story through the epilogue
The Meme Machine: “Locked In” Clips, Wallpapers, Figures, and Cosplay
“Zenitsu locked in” is the meme that made him a name outside the fandom. “Locked in” means total focus, and for him it has a specific visual: the moment he stops crying, goes blank, and starts moving faster than the frame can track. The edits — usually phonk music over the unconscious-form clips — became one of the fandom’s biggest formats on TikTok, Instagram, and YouTube Shorts. The joke works because it is true: his most terrifying self is the one that shows up when he passes out from fear.
For clean fan assets, start with the official character visuals on the Demon Slayer website and the Ufotable key visuals, then move to fan art on Pixiv, DeviantArt, and Pinterest. For gifs, the official clips on Crunchyroll give you proper source frames. Check the license before using any image commercially.
Officially licensed figures come from MegaHouse, Banpresto, and Good Smile Company. The deluxe editions typically add an electric-effect stand, a second head (awake and unconscious), and a poseable yellow blade.
His cosplay is simple to build: a spiky blonde wig, the green Demon Slayer Corps uniform, and a yellow Nichirin prop. Two expressions sell it — the panicked face for the character, and the locked-in glare for the edits.
How to Draw Him in Five Easy Steps
Five steps, no art degree required:
- Start with a round face and a slightly pointed chin. Add the big, round eyes and sharp brows — those two carry both expressions
- Block in the hair: bright yellow, spiky on top, with a few longer bangs falling across the forehead
- Add a small, surprised mouth for the crying version, or a tight, focused mouth for the locked-in version
- Draw the body in the green Demon Slayer Corps uniform. Keep him a little stocky and a head shorter than Tanjiro
- Add the yellow Nichirin sword on the back, then finish with lightning lines for the awakened shot
Practice the two faces separately. The crying version and the awakened version are the two faces the fandom actually wants.
What Does the Name Zenitsu Mean in Japanese?
The first name Zenitsu (善逸) breaks into two kanji: 善 (zen), meaning good, kind, virtuous, and 逸 (itsu), meaning quick, prompt, outstanding. Put together, the name reads as “quickly good” or “a talent that shines instantly.”
That is the point Gotouge made: the name describes the one thing he truly is — fast, brilliant, and ready before he can stop himself from panicking. It is the kind of naming a manga uses to telegraph. The name is a spoiler for the one strength that is real.
Frequently Asked Questions
Does Zenitsu die in Demon Slayer?
No. He survives the final battle and appears in the series’ last chapter with his daughter.
Supporting detail: the ending confirms he lives on as a slayer’s father, a few years after the fall of Muzan Kibutsuji.
How old is Zenitsu from Demon Slayer?
16 at story start, born around 1901.
Supporting detail: the series opens in 1917, during Japan’s Taisho era, which fixes his birth year within a couple of years either side.
How tall is Zenitsu Agatsuma?
155.5 cm, about 5 feet 1 inch, per the official character data.
Supporting detail: the same data sheet lists his blood type as B and his birthday as February 24.
Is Zenitsu a Hashira?
No. He is one of the Corps’ strongest slayers, but the story never gives him a Hashira seat.
Supporting detail: the Thunder Breathing seat remains with Sound Hashira Tengen Uzui through the end of the series.
Who does Zenitsu fight in the Infinity Castle?
A fast solo demon in the castle, whom he beats with a perfect Thunderclap and Flash, then Muzan Kibutsuji in the final battle.
Supporting detail: the castle separates the group, which is why his first Jukujima fight is a one-on-one before he re-joins the main battlefield.
When is Zenitsu’s birthday?
February 24, which makes him a Pisces.
Supporting detail: the date comes from the official character profile published with the series.
Why This Slayer Earns the Search
Zenitsu is the character who turned a flinch into a superpower. He is the fastest human in the series, the emotional core of the trio, and the meme that carried the fandom through three seasons of edits.
You now have every confirmed fact on this page, so skip the scattered fan wikis. Read the battle table before your next watch party, drop the name meaning into the group chat, and try the drawing steps this weekend. The fandom will notice.
Which fight is your favorite — the Final Selection survival, the Swordsmith Village stand, or the Infinity Castle perfect form? Tell us in the comments, and bring a screenshot of the perfect form to back it up.