Assassin (Fate/Crossover - Yoriichi Tsugikuni)

**Assassin** (アサシン, *Asashin*) is the servant of ??? in the ??? Holy Grail War.

*"My dream was to live a quiet life with my family in a small house where we would sleep side by side. I would be close enough to see the beloved faces of my wife and child and close enough to reach out and take their hands. That would have been enough. But even that... did not come true. Demons exist in this beautiful world."* - Yoriichi Tsugikuni

## Profile

### Identity

Assassin's true identity is **Yoriichi Tsugikuni**, a legendary Demon Slayer who lived nearly 500 years ago during the Sengoku Era (the Golden Age of Demon Slayers), as well as the strongest Demon Slayer to have ever existed. He is also the progenitor of Breathing Styles, being the one who created Sun Breathing.

Assassin was born as a twin. While already unnatural, the mark he bore almost caused his short life to be ended by his own father. Only by the rage of his mother was he allowed to live. Living as an outcast, he was meant to be sent to a temple and be forgotten forever.

However, his natural talent with the blade made itself known in an innocent sparring match, defeating a grown man with ease. Since then, his position with his twin changed. But Assassin had no interest in becoming the heir nor any interest in ‘fighting’ his brother like this. Once their mother died, he would wander through the world, enjoying his freedom. One day, he would meet the love of his life and marry her years later.

But the life of Assassin was not meant to be peaceful. While he was away, his wife and his unborn child were killed by monsters of the supernatural. Demons. From that moment, Assassin knew his purpose. Meeting and training his fellow Demon Slayers, he tried his best to make the world a better place by killing the creatures that thought nothing of human life. Until one day, he would meet the cause of his suffering, the cause of everything.

Despite his best however, Assassin could not kill the creator of the demons that plagued his land. And right after that, he heard that his twin brother would join the demons. With his decision to spare a demon that seemingly freed herself from the enemy’s control, he was banished from the Demon Slayers for his mistake and his brother’s sin. From then on, records would be muddled about what happened with him. Only the end of his life would be ‘recorded’. As an old man facing and yet again failing to kill his own twin.

In the end, Assassin died while standing, having left behind nothing more than his style to a certain man living in the mountains.

### Appearance

Yoriichi is a tall man with a muscular build, fair skin, maroon eyes, and long spiky hair with red tips that he kept in a ponytail. He has a similar overall appearance to his twin brother Michikatsu, but unlike him, he was slightly more slender, had shorter bangs, and wavier hair than him. Yoriichi is always seen with an aloof and solemn look on his face, rarely showing emotion.

Yoriichi wore a red haori over a very pale orange-colored nagagi kimono with a black umanori-styled hakama, a pair of zōri with red straps and white tabi socks, with a Nichirin Sword carried at the left side of his waist, conventional to most Demon Slayers. He sported hanafuda earrings created by his mother as charms when he was thought to be deaf; he later gave them to his friend Sumiyoshi, who then passed the earrings down to his descendants and eventually Tanjiro as well.

### Personality

A man so humble one might believe he didn’t believe in himself at all. Someone who considered himself a normal man, or even a failure, despite evidence saying otherwise. Assassin was someone who saw worth in all life and condemned the monsters that snuffed them out with no regard whatsoever. He believed that his only purpose was to kill demons, something that he considered himself as a failure at.

A kind person. Perhaps too kind.

### Relationships

#### **Shuten Douji/Ibaraki Douji**

Cautious, as they were the definition of what he disliked about demons. Seemingly playful and human one moment, monsters the next. While they were allies, Assassin would make sure to keep an eye on them.

#### **Tomoe Gozen**

Someone who was between the lines of human and demon. Surprisingly, Assassin would always have a melancholic smile when facing her. Perhaps a memory of a time after his death giving him insight... ?

#### **Japanese Swordsmen**

Even if some might argue, Assassin would believe with his whole heart that he was nothing compared to those geniuses. After all, most of them succeeded in a way that he never did. Still, he was willing to spar and show them his breathing techniques if asked.

## Abilities

Yoriichi is the Strongest Demon Slayer in history, being born with the Demon Slayer Mark, access to the Transparent World, and Selfless State, as well as possessing a physique polished to the highest caliber and innate swordsmanship talent. As a seven-year-old child who has never picked up a sword before, he was able to defeat a trained sword instructor effortlessly and he was referred to as a miraculous prodigy beyond compare. After training as a Demon Slayer, Yoriichi could defeat multiple demons to where his older brother stated that he as a child couldn't even compare to him as an adult.

He alone among the Demon Slayer Corps was able to corner Muzan Kibutsuji and overpowered him in an instant, having him on the verge of death until he barely managed to escape. Despite having avoided death, Muzan was deeply scarred by that encounter, referring to him as a monster, and even the sight of his earrings made him tremble in shock, while mere memories of Yoriichi caused the bodies of other demons who have never met him to tremble.

Shortly before his death of at least 85 years in age, he battled his older twin brother, Kokushibo who turned into a demon. Despite his advanced age, he quickly gained the upper-hand in the battle with a single move, slitting his throat before he finally died standing up, unscathed. Kokushibo himself admits that if Yoriichi launched a second swing before dying, he would have killed him, while commenting Yoriichi's power was still in his prime.

Yoriichi is the greatest swordsman to have ever lived. Even as a seven-year-old child with no training, he was capable of easily defeating a trained swordsman the very first time he ever picked up a sword, striking him in multiple areas across his body faster than the eye can process. His swordsmanship was so tremendous that a battle doll modelled after him had to be made with 6 arms wielding katanas and utilizing 108 techniques to even attempt to imitate Yoriichi's skills, and even then, the doll was still vastly inferior compared to him. His swordsmanship easily overwhelmed the Demon King, Muzan Kibutsuji and he would have killed his twin brother, Kokushibo, the strongest swordsman in the current era, if he didn't die of old age.

### Skills

#### Class Skills

* Presence Concealment (D Rank): Suppresses one’s presence as a servant. At this level, it is more of a minor reduction and is suitable for spying.

#### Personal Skills

* See-Through-World (A Rank): Assassin had the ability to see the "see through world", allowing him to see the muscles, blood flow, and joint movement of his opponents. He can accurately predict and anticipate the movements and attacks of his opponents with this ability, seemingly increasing his skill in terms of evasion and speed. In this case, it is similar to Clairvoyance. On top of that, this ability erases the user’s spirit and bloodlust entirely, making it difficult to read Assassin.

* Breathing Style Sun (A Rank): The name granted to Assassin’s Breathing and Walking, which he had mastered since birth. It represents the control and insight of one’s body. On top of that, the name of “sun” was granted to show its superiority over the demons as a symbol of their weakness and the height it had compared to the other ‘versions’ Assassin taught.

A skill that raises one’s STR and AGI parameter, as well as granting the user Mana Burst (Sun) C, causing his blade to radiate with heat that scorches his enemies.

* Demon Slayer (EX Rank): The skill representing Assassin’s life and profession. It grants bonus damage against opponents with the “demonic” trait.

Regarded as the strongest Demon Slayer in history, as well as his ‘only reason to exist’ according to Assassin himself, his affinity in killing demons was incalculable. As long as the user wouldn’t get distracted or stopped by outside factors, any demon Assassin would face was as good as dead.

### Noble Phantasm

#### **13th Form - Hinokami Kagura; "Dance of the Fire God"**

The perfected technique of the Breath of the Sun, created when Assassin faced the Progenitor of Demons. Met with such a dangerous opponent, it pushed Assassin over the limit, creating the change to kill the unkillable once and for all. To become less a human and more a spirit in that instance.

It was more accurate to call it a sequence of techniques, put into a dance. 12 forms, one after another and begun anew, the later named ‘dance’ was an apt description. By invoking the True Name of this Noble Phantasm, Assassin would become a spirit of fire itself. 12 forms in an instance, over and over again, engulfing the target in cuts and fire as if they were trapped by the sun itself. Any sort of healing or regeneration would be denied if it was beneath the rank of this Noble Phantasm. On top of that, one would need area of effect attacks to have a higher chance at hitting Assassin, as he would become as slippery as fire.

Naturally, if his target is a demon, the effectiveness in terms of damage and anti regeneration rises immensely.

## References

https://kimetsu-no-yaiba.fandom.com/wiki/Yoriichi\_Tsugikuni

https://hero.fandom.com/wiki/Yoriichi\_Tsugikuni

https://vsbattles.fandom.com/wiki/Yoriichi\_Tsugikuni

https://forums.spacebattles.com/threads/summon-a-servant-mark-vi-the-dark-six-f-sn-crossover-servants.370875/page-327?post=64776071#post-64776071