Seiji Kosetsu

**Seiji Kosetsu** is minor supporting character in Demon Slayer: Blade of the Night. He is the seated Snow Pillar.

## **Appearance:**

Seiji is a tall man with grayish tan hair styled in bangs, pale skin and an often impassive, serious expression. Seiji's internal body temperatures are so cold that he often forms clouds whenever he speaks, regardless of the room temperature.

Seiji wears the traditional Pillar Uniform, tinted brown, covered by a grayish beige kimono Instead of a haori, Seiji wears a heavy fur coat, apparently made from bear. It hangs on his shoulders like a cape, and doesn't seem to hinder his movement whatsoever

## **Personality:**

Seiji is both described and shown as someone incredibly stern, serious, and generally speaking a person very few want to ever meet. His face displays a constant scowl that perfectly encapsulastes his behavior, and never once did he display any sort of generosity or positive trait during his life as a Slayer, to the point where he considers himself as something "not human" that doesn't fail.

He doesn't go out of his way to be rude or nagging, staying entirely silent unless prompted, and only replying with short sentences. If he finds the question to be worthless, or the one that asked it to be annoying, he will reply with very poor manners, but never crudely.

Seiji expects utter perfection from his surrogates, and himself. His disciples at the Snow Sect are forced to endure an insane training regiment, where the trainees are generally treated worse than in other Sects. The extent of these regiments is so utterly destructive that even the more powerful members of the Snow Sect, be it Cultivators or Squad Leaders, will cover up for most failings on their underlings' parts.

## **Synopsis:**

Nothing is currently known about Seiji's backstory. It can be noted that in one Gikuro's Slayer School episode, he says that he once took revenge on someone using his Snow Breathing. Any details of the event, or the context behind it are unclear.

## **Abilities:**

**Monumental Strength:** Seiji, from a young age, was capable of tearing through rooms of the Infinity Castle with ease.

**Monumental Speed:** Seiji, as a Pillar, can be inferred to be extremely fast.

**Tactical Intellect:** Seiji has displayed enough tactical intellect to analyze when Nakime made a single slip-up, being willing to play a battle of attrition to find a weak point on her.

**Total Concentration Breathing:** Seiji has already mastered Total Concentration Breathing, as the creator of the Snow Breathing.

**Demon Slayer Mark:** While not shown, Seiji has a Demon Slayer Mark, as he is a Pillar.

## **Fighting Style:**

**Master Swordsman:** Seiji is an incredibly swordsman, being a prodigy of his time and judging by his perfeccionist personality, he is most likely immensely skilled.

### **Breathing Style:**

**Snow Breathing** *(Yuki no Kokyu)*: Seiji is the creator, and strongest user of the Snow Breathing Style. He has successfully developed it, and with it, became one of the strongest humans alive, creating twelve Forms to fight, a feat nearly unheard of, to make so many Forms in a few years for a totally original Style.

#### **Techniques:**

* **First Form: Hail Wheel** *(Ichi no Kata: Hyo Hoiru)* - The user spins their body around, swirling the sword in a quick wheel, the movement doesn't stop until the user deems the movement complete.

* **Second Form: Frostbite Weave** *(Ni no Kata: Tosho Ori)* - The user will jump around surfaces in a round pattern, and upon finding an opening, will dash forward to attack

* **Third Form: Blizzard Tide** *(San no Kata: Fubuki Shio)* - The user will slide through the ground, slicing through the opponent's legs to destabilize them

* **Fourth Form: Hailstorm** *(Shi no Kata: Hyo Arashi)* - The user will jump up and dash downward directly atop the enemy, slashing them in half vertically, or simply using the Form to break their fall, or perform a single, powerful attack.

* **Fifth Form: Frozen Lake** *(Go no Kata: Kotta Mizumi)* - Similarly to the Water Breathing's Eleventh Form, the user will be perfectly still. However, this form is designed to counter, over simply defend, meaning it is, however, more lacking in defensive capabilities.

* **Sixth Form: Below Zero** *(Roku no Kata: Rei Ika)* - The user dashes sideways, sliding across surfaces and changing bases constantly to confuse the enemy, hitting at a random point among those accessible to the user

* **Seventh Form: Snowfall** *(Shichi no Kata: Kosetsu)* - The user slowly repeatedly strikes a descending opponent from multiple angles

* **Eighth Form: Unthawable** *(Hachi no Kata: Kaito Dekinai)* - The user will strike the opponent's chest, before slicing through them in an upwards movement

* **Ninth Form: Freezing Hell** *(Ku no Kata: Itetsuku Jigoku)* - The user will rapidly slice through the enemy's body, more specifically limbs with the intent to incapacitate

* **Tenth Form: Evaporating Hail** *(Ju no Kata: Hyo no Johatsu)* - The user will slash upwards with all their strength. This is meant to be used when crouching or on the ground

* **Eleventh Form: Rain of Ice** *(Ju Ichi no Kata: Kori no Ame)* - The user will slash downwards with all their strength, this is meant to be used when the target is directly below the user.

* **Twelfth Form: Icicle Drop** *(Ju Ni no Kata: Tsurara Otosu)* - The user will fall directly on top of the opponent, piercing their skull in one downwards jab with all their weight

## **Equipment:**

**Standard Nichirin Sword:** Seiji carries around a regular Nichirin Katana, with a baby blue blade, as expected from a Snow Breathing user. His hanguard is a silver hexagon shape, with each edge jutting out into triangles

## **Familiars:**

**Reiki:** Seiji's crow Reiki is much like its owner, quiet, and serious. Some say the crow was originally a lot more energetic, but Seiji's attitude eventually drained it out of all its good will.

## **Trivia:**

* Seiji's name has the following meanings: [Seiji] means "Lawful/Just", while [Kosetsu] has plenty of meanings, including "Snowfall", it is written with the meaning of "Workmanship/Skill"
* Seiji has no favorite food, nor does he have any food he dislikes the most.
* Seiji has no hobbies
* Seiji's openness is exactly 0%
* Seiji's opinions on his fellow Pillars are:
	+ Tanjiro: *Acceptably Competent.*
	+ Giyu: *Supposedly Competent.*
	+ Kyojuro: *Annoyingly Competent.*
	+ Gyomei: *Competent.*
	+ Sanemi: *Supposedly Competent.*
	+ Zenitsu: *Acceptably Competent.*
	+ Kanao: *Supposedly Competent.*
	+ Daisuke: *Incompetent Fool.*
	+ Obanai: *Competent.*
	+ Murata: *Incompetent. Misguided.*
	+ Shinobu: *Competent.*
	+ Mitsuri: *Incompetent Idiot.*
	+ Senjuro: *Supposedly Competent.*
	+ Suguru: *Incompetent.*
	+ Muichiro: *Competent.*
	+ Inosuke: *Incompetent Bafoon.*
	+ Aki: *Incompetent Imbecile.*
	+ Tengen: *Deceased. Retired before dying. Disgraceful.*