Koshiko Tadashi

### Relative(s)

Rei Tadashi {Father}, Evonie Tadashi {Older Sister}, Tophu Tadashi {Older Brother}, Eclipse Yoranagi{Friend}, Light Takashiko {Younger Sister}, Kaito Tadashi {Younger Brother}

## Portrayal

### English VA

Eclipse-San

Koshiko Tadashi was a Demon Slayer of the **Demon Slayer Corps**. He was a very talented young man who strived to become the next Ice Hashira, and protect his siblings. Koshiko was extremely strong and fast, though his physical endurance wasn't up to par with the rest of his physical attributes due to his skinny body, but despite that, he possesses a very strategical intellect. He was born on September 14, 1896.

## Appearance

Koshiko is a skinny, muscular young man with a light skin complexion. He has beautiful eyes that go from black to a crimson red. Though, he was bullied by some kids in his town because they thought that he has a demon since his eyes were black and red. Koshiko has semi-long black hair that covers his left eye.

Koshiko wears a dark, slightly turquoise tinted version of the demon slayer uniform. He also wears a dark navy blue haori that fades to white with black, fog like, mist clouds on it. The outfit includes kyahan that is similar to Tanjirō Kamado, a white belt, black tabi socks, and white zori with grey straps. Koshiko's uniform looks similar to Muichiro's and He has a unique Baby Blue Nichirin color.

## Personality

Despite his timid looks, Koshiko is actually a kind, outspoken young man. Though, he does have a temper that he doesn't show very often. Koshiko is an amazing strategist, and he even hold a soft spot in his heart for people that turned into demons because of a severe illness. He made a vow to protect every human and his family by all costs, even if it means that he has to sacrifice himself.

## Abilities

**Overall Abilities:** Despite his ranking in the **Demon Slayer Corps**, He's a very powerful swordsman, even if his defense isn't up to par with his offense. Koshiko has immense physical strength and speed, making him a very deadly opponent towards even the toughest demons. There are rumors around the corps that Koshiko once fought off a horde of demons with a broken katana and came out on top in the battle with little to no injuries, but he denies anything on the matter or changes the subject.

### Supernatural Abilities

* **Demon Slayer Mark:** Koshiko awakened his mark against Upper Rank 3, Akaza. He has two different designs but both do the same thing. When it manifested one mark took the form of snowflakes that go around his body. The most notable places that they form are on his right cheek. The mark increased his physical strength and endurance as soon as it activated which helped koshiko protect Giyū Tomioka from Akaza even after sustaining multiple injuries during the battle. Some say that his demon slayer mark is very similar to **Miyuki Kazahana** if not the same.

* **Bright Red Nichirin Blade:** Koshiko awakened the Bright Red Blade during the battle with **Muzan Kibutsuji**. This started to take effect when he charged at Muzan with full speed while firmly gripping his blade, aiming to use all of his Breathing Forms simultaneously. Despite him failing or being knocked away, he stayed determined and ended up perfecting his movements and successfully uses each of the forms simultaneously, creating the Ice Breathing's Thirteenth Form: Eternal Permafrost.

### Intellectual Abilities

* **Tactical and Strategical Intellect:** These abilities allowed him to almost always correctly predict the moves of his enemy and they also help him create a strategy during or before a battle. Nearly all of his strategies are amazing if not flawless.

### Physical Abilities

* **Enhanced Physical Strength and Speed:** Koshiko showed outstanding physical strength and speed during his training to enter the **Demon Slayer Corps** and as time passed, these abilities became more refined. Koshiko once went toe to toe with **Kyōjurō Rengoku** in hand to hand combat, showing that him and Rengoku are almost evenly matched.

## Fighting Style

**Master Swordsman:** Even though he doesn't think he's nearly as strong as the Hashira, he is a very skilled swordsman despite his age and ranking.

### Swordsmanship

**Ice Breathing** (氷の呼吸 Kōri no kokyū);A **Breathing style** that derived from the **Water Breathing** which was created by **Miyuki Kazahana** through extremely harsh training. Despite the original forms of ice breathing, Koshiko made 8 of his own forms, and only uses 1 of the original forms and the 4th form was created by another user.

1. **First Form: Glacier Diffusion** (壱ノ型:氷河拡散 *Ichi no kata: Hyōga kakusan*) - The user dashes forward at blinding speeds and slashes continuously in a horizontal cyclone pattern, creating an icicle cyclone.
2. **Second Form: Ice Wheel** (貳 (に) ノ型 (かた)  氷 (こお) 車 (しゃ) , *Ni no kata: Kōsha*?) - The swordsman leaps and vertically spins forward in the air while releasing a flowing attack in a circular motion.
3. **Third Form: Snowfall** (参ノ型:降雪 *San no kata: Kōsetsu) -* The user performs a heavy upward slash that transitions into a downward diagonal slash.
4. **Fourth Form: Icicle Fury** (​​肆ノ型: 氷柱怒り*Shi no kata: Tsurara ikari*) - The user uses their full speed to stab the target multiple times in order for the user to defend against enemy attacks or attack the opponent.
5. **Fifth Form: Falling Ice** (伍ノ型: 落ちる氷 *Go no kata: Ochiru kōri)* - The user would use an afterimage as a distraction so the user can go behind they're enemy and use two slanted slashes and finish the attack by decapitating they're opponent.
6. **Sixth Form: Exploding Ice** (陸ノ型: 爆発する氷 *Roku no kata: Bakuhatsu suru kōri)* - This technique is specifically used by koshiko. Koshiko dashes at his enemy and hits them with the handle of his blade, jumps behind them and throws down two ice bombs.
7. **Seventh Form: Ice Bomb Barrage** (七ノ型: 氷爆弾弾幕 *Shichi no kata: Kōri bakudan danmaku)* - This technique is used and taught by koshiko. The user stuns they're enemy by hitting them in the eyes, after the user does that, they'll launch themselves in the air and throw 10 ice bombs at they're enemy and use a mid-air ice slash to detonate the ice bombs all at once.
8. **Eighth Form: Frozen Calm** (八ノ型:凍った凪 *Haichi no kata: Kyōtta Nagi*) - This technique takes inspiration from **Water Breathing, Eleventh Form: Dead Calm**. A small blizzard forms around the user and they're enemy, the ground under and around the user would freeze, and a wave of Icicles that can be used to kill multiple enemies.
9. **Ninth Form: Blizzard Dragon God** (九ノ型: 吹雪竜の神 *Ku no kata: Fubuki ryū no kami*) - A devastating dashing slash that the user initiates from a high stance that seemingly takes the form of a Japanese dragon, the technique had enough power to carve a deep impression that left the ground damaged and frozen.
10. **Tenth Form: Eternal Permafrost** (十ノ型: 永遠の永久凍土 *Jū no kata: Eien no towa tōdo)* - This technique is specifically used by koshiko by himself. This form takes direct inspiration from **Sun Breathing, Thirteenth Form**. Koshiko created this form during the battle against muzan, helping tanjiro while he was using the thirteenth form of sun breathing, so koshiko thought to do the same by using all of the forms of his Ice Breathing technique simultaneously , thus he created a new form of ice breathing, and he named the new form "***Eternal Permafrost***". By doing this koshiko surprising **Muzan Kibutsuji** and **Tanjirō Kamado** but his siblings and the **Hashira**.