
Cyborg VTuber // Twitch Streamer // VSinger

Profile:
Full Name: Sejitsuna
Aliases: Seji, Codebreaker, Vindicta, Code 13
Code Type/Class: Dominator
Race: Cyborg?, Alien, Demon
Birthday: September 17
Height: 169 cm (with shoes on?)
Affiliation: XA, Void Serpents
Oshi Mark: ❎💜
Contact Me:
★ E-Mail ★
sejitsuna13@gmail.com★ Discord ★
sejitsuna★ X / Twitter ★
@Sejitsuna

About
"Former Special Agent of Khronos XII… or as they used to call me, Code 13.Back then, I protected a planet that feared me more than they feared war. They said I was powerful — but they never let me be powerful. Held me back, shackled my upgrades, whispered behind my back like I couldn’t hear them.Turns out, they were right to be afraid.
Because I found out the truth. About my Code. About them. And I didn’t just unlock my potential — I tore the locks off the whole system.Now? I don’t take orders anymore.
I break codes. I bend minds.My mission?
Simple: burn the lies, expose the rot, and dismantle every last thing that tried to control me.
The bounty on my head? Astronomical.
The threat I pose? Classified.So if you’re hunting me — run.
If you’re hiring me — pay up.
And if you’re flirting?
… try to last longer than the last one.~♥"
Socials
Background/Lore
★ (1) Debut: 2021/11/13 ★
Code Type: Protector (Custos)★ (2) Redebut: 2022/04/30 ★
Code Type: Idol (Simulacrum)★ (3) Redebut: 2024/02/23 ★
Code Type: Eliminator (Metamorphosis)★ (4) Redebut: 2025/08/?? ★
Code Type: Dominator (Vindicta)
More
★ Latest YouTube Video ★

★ UwU Market Merch ★
▸Hoodie, T-Shirt, Pants, Keychain and more!!
★ Affiliate Links: ★
▸ ROGUE ENERGY, use "CODE13" for a 10% Discount!
▸ DRINK POGGERS, use "CODE13" for a 10% Discount!- worldwide shipping -
@ Sejitsuna, all rights reserved.
Code Type: Dominator
(Vindicta)

art by melonix
★ XA COMMAND LOG ★Entry ID: 529-A
Subject: Sejitsuna
Classification: XA Recruitment Records – Special Cases
Commander: KailyleInitial Encounter:
DRW Unit stumbled upon Subject Sejitsuna during a standard readiness exercise in the western sector of New Haven’s forest zone. She was found in a compromised state — disoriented, injured, borderline unconscious. DRW initially flagged her as a possible Day Zero survivor. That theory was dismissed within the hour.Why? Because Day Zero was ten years ago. And no one, I mean no one, has survived undetected this long with all our recon sweeps and bi-weekly drills. Unless you’re a ghost. Or something stranger.Preliminary Assessment:
Subject identified as a cybernetic individual — specs, source, and system unidentifiable. Tech analysis flagged her implants as high-tier, off-grid, and definitely not from this solar branch.
Psych evaluation? Inconclusive. She's tight-lipped, but not hostile. Cooperative, if you don’t ask too many questions.We ran standard interrogation, security scans, recruitment offers. She passed the tests, dodged the questions, and declined the invitation. Politely. Took the XA badge though. Said:“Just in case I need a way back in.”
Which, in this business, might as well be a blood pact.Return Entry:
Three years later, she walks through the gates like she owns the place. New look, new limbs, same unreadable expression. She didn’t ask — she informed us she was here to join. And we let her.Second assessment was cleaner than a lab floor on inspection day. No red flags, just... odd ones. Multiple NHS units reported inexplicable “mood boosts,” “combat clarity,” and in one case, a spontaneous singing and dance competition in the mess hall.Yeah. That happened.We’re currently investigating possible passive influence effects — emotional resonance? Neural interference? Some sort of charm protocol? Jury’s still out.Commander’s Note:
I’ve seen war machines, deserters, rogue agents, actual demons — but I’ve never met anyone quite like Sejitsuna. She’s unpredictable, dangerous, and entirely herself. She’s also loyal, sharp, and strangely easy to trust — once you stop asking too many questions.Make no mistake: she’s not here for redemption. She’s here because she chose to be. And I won’t waste that.She’s XA now.
May the other planets watch their backs.
Chapter 4
"Betrayal's nemesis"
★ Debut: 2025/08/?? ★The mission that changed everything took place on Phyllon — the lowest-ranking planet in the system. A lawless world ruled by cyborg demons, Phyllon was a wasteland of ash and steel. Its skies were choked with smoke, its cities stitched together from rusted tech and salvage. Resources were scarce, but for those desperate or dangerous enough, Phyllon offered one thing no other planet could: upgrades — powerful, illegal, and dangerously unregulated.Sejitsuna needed one.With bounty hunters hot on her trail and her mission compromised, she had no choice but to disappear into Phyllon’s underbelly. Ironically, the very hunters sent to capture her were the ones who helped her escape — after eavesdropping on her mutterings and discovering what the stolen blueprints truly contained, they made a choice. Instead of claiming the bounty, they brought her to the Void Serpents — a shadowy clan of cyber-enhanced demons.The Void Serpents led her to the best ripperdoc on Phyllon. He was skeptical — Khronos tech was unlike anything he’d ever seen — but the potential was undeniable. He agreed to attempt the upgrade… on one condition: Sejitsuna would owe the clan. With Khronos XII no longer her home and enemies multiplying by the day, she accepted. She needed allies, no matter how infernal they were.The procedure was brutal. Her code had evolved into a new form — Dominator — a powerful upgrade focused not just on destruction, but influence. Control. With it, she could bend energy, sway minds, empower allies, or unravel enemies from within. But the change came at a cost: parts of her body had to be rebuilt, reengineered from the inside out.Her old form burned away. What emerged was something new — something feared.A cyborg demon with the soul of a broken protector and the fire of a rising queen.But Phyllon, for all its firepower, couldn’t shield her for long. The Void Serpent clan was too small, too fragile to protect her from the growing number of bounty hunters. And Khronos XII? They definitely knew she had defected. Her face was plastered on wanted posters, her name echoed in every back-alley comm station.She needed more.That’s when she remembered Earth — and the group that once tried to recruit her. The X-traordinary Assassins, or XA. She had refused their offer once, but not out of fear — she just didn’t need them. Back then, she was still Code 13. Still loyal.But now?Now she was free.Digging through her old belongings, she found the XA badge they’d given her long ago — a keepsake she’d never thrown away. With a quick warp jump, she returned to Earth and tracked down their HQ: New Haven. Flashing the badge and skipping formalities, she let herself in.After all, she knew the leader personally — Kailyle. And they owed her.They welcomed her in.Now, Sejitsuna stands reborn — code name Dominator, Codebreaker, member of the XA, weapon of vengeance.Heaven couldn’t keep her. Hell couldn’t build her.The galaxy’s just lucky she’s in a good mood.—for now.
Code Type: Eliminator
(Metamorphosis)

art by melonix
Chapter 3
"Unstable Obligation"
★ Debuted: 2024/02/23 ★While Sejitsuna was enjoying her time on Earth, a surprise attack struck Khronos XII. It came swiftly and with devastating power — the source still unknown to this day. The capital burned. Lives were lost. And Seji wasn’t there to stop it. The guilt of her absence carved itself into her, a wound deeper than any blade.In the wake of the devastation, the remaining protectors of Khronos came to a bitter realization: they were no longer strong enough. The planet’s enemies had grown bold. The time for passive protection was over. They needed evolution.Upon reviewing the existing Codes, it became clear — Sejitsuna's Code held the most potential. Her framework was still flexible, her abilities adaptive. She agreed to the augmentation, driven by guilt and duty. Her title changed. No longer just a protector, she became the Eliminator. Her code designation evolved. Her movements sharpened. Her strength increased tenfold. Her loyalty, however — that remained the same. Absolute.She was assigned as Khronos XII’s Special Agent, tasked with defending the planet from external threats before they could ever breach its atmosphere. Silent, swift, and surgical — Sejitsuna eliminated threats with precision. She didn’t ask questions. She followed orders. She erased enemies.Until the mission.Stolen documents. A high-priority retrieval. It was supposed to be straightforward. She tracked the thieves, fought off bounty hunters, secured the briefcase — but the contents spilled mid-battle. What she saw changed everything.The documents weren’t about planetary defense. They were about her. Schematics, notes, classified logs — revealing that her Code had been deliberately restricted by her own people. The enhancements she received were just a fraction of what was possible. The planet feared her full power. Feared her.She completed the mission. Retrieved the data. Eliminated the threats. But she didn’t return.From that day, Code 13 vanished. Sejitsuna erased it herself.
Code Type: Idol
(Simulacrum)

art by melonix
Chapter 2
"Ephemeral Stage"
★ Debuted: 2022/04/30 ★Before she was an Eliminator, before betrayal and vengeance shaped her path, Sejitsuna lived a life that felt like a dream.Earth was never meant to be permanent. Officially, she was stationed there on standby, still a protector of Khronos XII, but the galactic peace meant her services were rarely needed. And so, for the first time in her life, she was free.On Earth, no one knew her as Code 13 — the cold, precise protector from a distant, dominant world. Here, she was just Seji. A curious, radiant presence drawn to neon lights, rhythmic music, and the exhilaration of the stage. The life of an Idol called to her — the thrill of performance, the freedom of expression, the feeling of being seen for something other than power.She rewrote her Code to suit her new persona, altering her appearance with elegance and flair. Crowds cheered. Lights followed her. For a brief, shining moment, she was loved not for what she could destroy — but for what she could create.But dreams have their price.While Sejitsuna was dancing on stage, Khronos XII was under attack.
Code Type: Protector
(Custos)

art by melonix
Chapter 1
"Duty of Deceit"
★ Debuted: 2021/11/13 ★Sejitsuna should have been dead.When a powerful laser struck the capital of Khronos, she was believed to be among the many lost. Her body was never found. Officials declared her dead.But she returned. Ten years later.Code 11 had sensed it first. Someone, somewhere, still carried a fragment of the original Guardian Code. That someone was Sejitsuna. She arrived at his doorstep, alive and unwavering, revealing the truth: the code had marked her. A glowing symbol under her chest and horns on her head proved it.He didn’t know how she had survived — only that she had. And he welcomed her without question.Not long after, two more individuals surfaced, each bearing a mark and a set of horns. They became Code 14 and Code 15. With Seji as Code 13, the new protectors of Khronos XII were complete.As fragments of the original Guardian Code, each protector wielded unique, uncorrupted abilities. Together, they restored their planet’s strength, raising Khronos XII to the highest tier of the galactic hierarchy. A planetary shield protected them. Enemies turned away. The protectors trained relentlessly, fighting off threats and sparring with one another to sharpen their powers.On one mission, Seji was sent to investigate a derelict ship that had crashed on a nearby moon. But the vessel was a trap. Explosives detonated inside, forcing Sejitsuna to act on instinct. In a desperate moment, her code surged — and a portal opened.She vanished from the moon and reappeared on Earth.There, she was discovered by operatives from XA — the X-traordinary Assassins. They tended to her injuries and offered her a place among them. But Seji declined. She wasn’t done chasing freedom.And so, her unexpected journey on Earth began.
Prologue
Sejitsuna’s story began on the planet Khronos — long before it earned the name Khronos XII. She was born in the Capital, living what could be considered a typical life for a young cyborg. But peace on Khronos was fragile at best. The planet, positioned fourth in a seven-tiered galactic hierarchy, was a tempting target — weaker than most, and frequently attacked by rival worlds hungry for expansion.In this universe, every planet is protected by a single Guardian — beings blessed with extraordinary abilities. Khronos, the first and oldest of all known planets, should have had the most powerful Guardian. But instead, their power was flawed, corrupted by an unstable code known as Code 0. The Guardians of Khronos ruled like monarchs, and their authority was passed down through a lineage of rulers identified only by their numeric titles. The last reigning queen was known as Code 10.But the people of Khronos had learned not to rely on their Guardian. The corruption in the code made the ruler powerful, but unstable. In the end, it was up to the people to protect themselves.Then came the tragedy.Without warning, a mysterious planet unleashed a devastating blast that annihilated much of Khronos’ Capital. Thousands perished. Sejitsuna’s body was never found. The authorities searched the ruins, found nothing, and declared her dead.And yet, hope emerged from the ashes.A brilliant young technologist, driven by desperation and vision, proposed a radical solution — a complete reengineering of the Guardian system. The original Code, believed to be unfixable, could be replaced with a synthetic version. The Queen, Code 10, agreed to the plan — sacrificing her life for her people.The new system was born: a vast planetary shield powered by a radiant artificial source, detectable across the galaxy. It was more than protection — it was a declaration. The engineer was granted the title Code 11, and the reborn planet became known as Khronos XII.No one dared to challenge it again.Thanks to Code 10’s sacrifice… and Code 11’s mind.