Hachu Samui

## Portrayal

**Hachu (Hachi) Samui** is a doctor and a Demon Slayer who works for the Demon Slayer Core. He is a reoccurring, but not constant character in Demon Slayer: Blade of the Night, and a close friend of the protagonist group.

## **Appearance:**

Hachu is a boy of average height, and a pale, slim completion. He often looks incredibly angry, as if he is a tick away from bursting, even if that is not really the case. He possesses sharp black hair styled in an undercut curtain, and very thin eyes, that often lead to people thinking he's squinting.

Hachu wears the traditional Demon Slayer Medic outfit, that being a white variant of the normal uniform, with the details being black, rather than white, as he is unranked. He prefers to wear a lab coat above his uniform, but when on missions, he switches it for a dark green haori with a shibori weave pattern.

Tomodachimaru, his serpent, is similarly dark in color, but it is closer to brown in color.

## **Personality:**

Hachu, betraying his true feelings, but working well alongside his appearance, usually shows a cold, bitter facade that is very uninviting towards most. Hachu, however, is a very kind person, being quick to help Ryo when he saw how the boy was after talking to Kaguya for the first time since she had been placed in a coma, comforting him and giving him the best piece of advice he could give. Hachu is very caring, even if he doesn't show it directly, rather, he often scolds his friends for being careless, and whatever other dangerous mistakes his friends might make, showing he does care, even if in a sideways manner. Shinku in particular is often the target of such scoldings

Hachu receives compliments very poorly, usually looking to the side and pretending he didn't hear anything.

Hachu is, first and foremost, a doctor, and trained to become a Slayer primarily for the health benefits and because it was one of the requirements to eventually become the Head Doctor of the Core Hospital. This means that, while competent, he isn't incredibly skilled or strategic, often relying on others to fight. Despite not giving in to pressure, he knows his limits, and relegates himself to being a combat doctor at best.

Hachu's biggest dream and main objective is to find a cure for demonkind, as he understands that more often than not, demons aren't converted out of their own will, and their actions are similarly unguided. He strives to cure demonkind in its entirety, as the method Tamayo used to cure Nezuko was lost to time, and seemed incredibly difficult to perform either way.

Hachu, since going deaf, has secluded himself, indicating a tendency to bury himself away from all others when distressed. This is best shown in how, despite effectively residing in the Core Hospital, he does not work any longer, and spends his days reading to think of a method on how to get back his hearing.

## **Synopsis:**

Hachu comes from a relatively poor family, where his father, the town doctor, suffered the misfortune of having his wife be turned into a demon. Hachu, as an only child, spent most time alone, as his father locked his demon mother up to keep her safe while he worked on a cure. It was a matter of time until the woman broke out, killing his father and a handful of villagers, all the while using the last remains of her sanity to keep Hachu safe from her, and kill herself in the Sun. Since then, Hachu has aimed to find a cure for demonkind.

## **Abilities:**

**Above Average Strength:** Hachu, while not particularly strong, is a Breathing Style user, and therefore, is more powerful than the average person.

**Superhuman Speed:** Being light, and a Breathing Style user, Hachu is much faster than the average person, and he tends to use his naturally high speed to overcome most challenges.

**High Intellect:** Being adept at medicine, Hachu might not be the best strategic mind out there, but he is, by a large margin, the most intelligent member of the new generation of Slayers.

**Total Concentration Breathing:** Hachu has successfully mastered the Serpent Breathing, but did not dive deeper into mastering its techniques.

**Demon Slayer Mark:** By being around Marked Slayers often, from Pillars and Tsuguko that seek treatment, to people such as Dr. Chiguro, Hachu has received the Mark. However, due to his lacking body, he had yet to awaken it. However, after being forced into a very particular situation that met all conditions of awakening, his Mark awoke, and left a strain in his body so powerful he entered a brief coma, and has yet to finish recovering. His Demon Slayer Mark is formed from what appears to be ink blotches vaguely shaping themselves like a coiling snake in his right arm.

**Medical Skill:** Despite lacking fighting ability, Hachu is incredibly adept at medicine, being one of the best, and most reliable doctors in the entire Demon Slayer Core. He can treat many ailments with barely any tools, seen when he saved Taro from his injuries in the Final Selection, and later on, treated all of his friends into near perfect fighting condition in the Tokyo Arc.

## **Fighting Style:**

**Capable Swordsman:** Hachu is an acceptable fighter, being capable of perform his Serpent Breathing techniques without perfection, but not lacking competence either.

### **Breathing Style:**

**Serpent Breathing** *(Hebi no Kokyu)*: Hachu is acceptably competent at the Serpent Breathing, being only marginally better at it than the average Serpent Breathing user. Despite his talent, he hasn't taken the time to properly hone his techniques.

#### **Techniques:**

* **First Form: Winding Serpent Slash** *(Ichi no Kata: Idagiri)* - The user moves like a slithering snake and releases several slashes in a winding pattern. This attack can be done while advancing to increase its efficiency, it is, however, too tiring to use in more than one enemy in a row.

* **Second Form: Venom Fangs of the Narrow Head** *(Ni no Kata: Kyozu no Dokuga)* - The user dashes behind their opponent at blinding speed and aims to swiftly slice off their head. This attack is completely silent, and works well at stealth

* **Third Form: Coil Choke** *(San no Kata: Toguro Jime)* - The user circles around their opponent while using their sword to slice them from all directions, pressing them closer and closer to the center, eventually culminating in a decapitating slash, or a follow-up by an ally

* **Fourth Form: Twin-Headed Reptile** *(Shi no Kata: Keija Sosei)* - The user leaps forward and performs a horizontal slash that slices through the target. This attack can be done over and over, showing great effect, but it doesn't work well on waves of targets

* **Fifth Form: Slithering Serpent** *(Go no Kata: En'en Choda)* - The user curves their sword in multiple directions and slices their opponent, making it capable of decapitating multiple enemies at once, or pushing a single defensive enemy much further than they should be.

* **Sixth Form: Serpent's Lunge** *(Roku no Kata: Hebi no Tosshin)* - The user will dash strongly, using all of their leg strength to attack once. This attack often destroys the ground where the dash started, the user leaping so strongly they don't touch the ground until after the target was reached.

* **Seventh Form: Shield of Scales** *(Shichi no Kata: Uroko no Tate)* - The user mimics a snake, twisting their entire body like a coil to defend attacks from all sides. This is a strange attack to look at, so more often than not, the attacker won't even realize their blow was blocked.

## **Equipment:**

**Nichirin Indonesian Kris:** Hachu, as expected from a Serpent Breathing user, carries around an Indonesian Kris Sword, with a winding blade that is lavender in color, and Hachu's hanguard is a silver intricate pattern composed of two snakes winding within themselves. Much like Obanai Iguro's own, his scabbard is designed so that he unsheathes his blade vertically.

**Medical Equipment:** Hachu carries a multitude of medical apparel, such as bandages, tweezers, antiseptic, gauze, sewing line, a couple of needles, wisteria vials, disposable gloves and a syringe.

## **Familiars:**

**Ganko:** Hachu's Crow, named Ganko, is quite cheerful, and often likes to dance. This makes Hachu smile almost always

**Tomodachimaru:** Hachu's pet serpent and potentially his best friend, Tomodachimaru is a gentle, but shy serpent that often hides under Hachu's clothes due to its anxiety.

## **Trivia:**

* Hachu's name is simple in meaning: [Hachu] means "Reptile", and [Samui] means "Cold". Both are extremely straightforward in meaning, and that is somewhat intentional, as Hachu himself does not intend on making his deeper feelings known by anyone, so he also much rathers have a surface-level name.
* Hachu was not meant to survive the Final Selection originally, but seeing how he never had a direct confrontation on it, and considering his later character development, the author chose to keep him alive.
* Hachu's favorite color is blue.
* Hachu's openness level is about 55%
* Hachu's favorite food are shrimp dumplings.
* Hachu was never even considered to join the main cast.
* Hachu was invited to Shinku's Trial, but refused the invitation on accounts of working on a cure for his ears.
* If Hachu was in Kimetsu Gakuen, he'd be the sort of kid that would never go to any parties or outings, as he'd spend his entire time studying. That said, his grades would be perfect.