Tegan

Demon Tengen Uzui (Demon Tegan) — Complete Profile

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Basic Information

Name: Tengen Uzui (Demon Form)

Alias/Nickname: Demon Tegan, Sound Demon, The Flamboyant Oni

Species: Demon (formerly Human, ex-Hashira)

Affiliation: (AU) Upper Moon rank, likely between Upper Moon Four and Six

Former Affiliation: Demon Slayer Corps, Sound Hashira

Status: Alive (AU), active demon

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Appearance

Height: Still exceptionally tall—around 198 cm (6'6"), but now even more imposing with demonic aura

Build: Broad-shouldered, extremely muscular, but now with a supernatural, otherworldly grace

Skin: Pale with a faint lavender/ashen hue, sometimes shimmering under moonlight

Eyes:

Irises: Shifting magenta and gold, with black, vertical slit pupils

Sclera: Darkened, deepening the predatory gaze

Hair: Wild, white with faint purple streaks; longer and often flowing freely or in a high ponytail

Horns: Two prominent, curving horns (pale pink or blood red), sprouting from the forehead or hairline, adorned with golden bands or jewels

Markings:

Red gem-like demonic markings across face, arms, and chest—arranged like jewels, echoing his shinobi past and demon mutation

Blood-red or deep purple tattoos winding up his forearms and neck, glowing faintly when he uses Blood Demon Arts

Jewelry:

Retains his signature gemstones and gold accessories, but they appear fused into his skin or bone, with new demonic embellishments

Outfit:

Remnants of his flamboyant Demon Slayer uniform, now tattered and fused with demon silk and armored plating

Sash/belt with a honeycomb pattern, now stained darker, and armored shin/arm guards twisted into organic, demonic forms

Weaponry:

Wields demonic versions of his dual Nichirin cleavers—blades fused to his arms or dripping with demonic energy, connected by a living chain of flesh and metal

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Personality

Flamboyant as Ever:

Retains his larger-than-life, attention-grabbing energy—craving an audience and spectacle even as a demon

Prideful:

Sees himself as the “flashiest” of Muzan’s Upper Moons; refuses to hide in the shadows

Tactical Mind:

Shinobi cunning is amplified—master of traps, deception, and misdirection, using sound and illusion in combat

Conflicted Humanity:

Deep down, traces of his human love for his wives and sense of loyalty linger, occasionally weakening his resolve against old friends/allies

Sadistic Playfulness:

Toys with Demon Slayers, challenging them to “extravagant duels,” and giving opponents a fighting chance—only to overwhelm them spectacularly

Desire for Worthy Rivals:

Craves strong opponents who can keep up with his speed, sound, and spectacle

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Abilities & Powers

Demonic Physiology

Regeneration:

Heals severe wounds rapidly, can reattach limbs or recover from fatal damage (unless hit by a Nichirin blade/poison)

Superhuman Strength & Speed:

Now even faster and stronger than in his human days—moves with blurring swiftness, able to shatter buildings with a single strike

Enhanced Senses:

Hearing is supernatural—can detect heartbeats, whispers, and the movement of Demon Slayers miles away

Aura of Intimidation:

Projects a dazzling, overwhelming demon aura that stuns weaker opponents

Blood Demon Art: Resonant Requiem (響宴の血鬼術, Kyōen no Kekkijutsu)

Sound Manipulation:

Creates and controls devastating waves of sound, from subsonic tremors to shattering, high-pitched attacks

Demonic Musical Score:

Can “score” the battlefield, predicting enemy moves by reading their rhythm—translating his old fighting style into deadly, preternatural anticipation

Sonic Constructs:

Generates razor-sharp crescendos, concussive blasts, or disorienting harmonies that cause hallucinations or internal bleeding

Gem Bombs:

Creates exploding demonic jewels, scattering shrapnel laced with his blood to poison or slow Demon Slayers

Weapon Mastery

Demon Cleavers:

His chained swords can extend, multiply, or become whips/blades of pure sound and energy

Living Chain:

The chain binding his blades is alive, capable of grappling, constricting, or draining life from opponents

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Weaknesses

Sunlight:

Like all demons, is instantly destroyed by direct sunlight

Nichirin Swords:

Vulnerable to blades wielded by Demon Slayers, especially if infused with wisteria poison

Lingering Humanity:

Emotional ties (memories of his wives, old Corps comrades) can cause hesitation or outbursts of grief, making him unstable in rare moments

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Relationships

Muzan Kibutsuji:

Fiercely loyal—sees Muzan as a patron of his new, extravagant power, but occasionally rankles at being “just another pawn”

Upper Moons:

Rivalry with Doma and Akaza—competes for Muzan’s attention, but refuses to blend in quietly

Hinatsuru, Makio, Suma (His Wives):

Their fate is a source of pain; in some AUs, he seeks to protect them or is tormented by guilt, hunting for a way to “free” them from mortality or corruption the three left him

Demon Slayer Corps:

Views former allies with a twisted sense of affection and competition—may try to “convert” worthy slayers to join him in immortality, or offer “mercy” to those he once cared for

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Notable Quotes (Headcanon/Inspired by Canon)

“Flashiness isn’t just for the living—watch as I make even death extravagant!”

“The weak are silenced, but true warriors earn their encore!”

“I may be a demon now, but I’ll always be the flashiest in the room.”

“Step up, Demon Slayer. Show me if your heart can outshine the darkness!”