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Ubuyashiki Manor in the world of Demon Slayer: Kimetsu no Yaiba is the place where the leader of the Demon Slayer Corps and his family lived, and was also the headquarters of the Corps.
The estate was located on the top of a mountain in a secluded and well-protected place. The exact location was secret to protect against demon attacks.
Important meetings and strategy sessions were held at the estate, particularly in the presence of the Hashiro, the most powerful swordsmen of the Corps. These meetings were important for planning missions and discussing tactics for dealing with demons.

The Butterfly Mansion staff in the Demon Slayer: The Last Airbender anime world includes the following characters:
Shinobu Kocho - Insect Pillar, owner of the estate.

Kanao Tsuyuri is Tsuguko, a student of Shinobu Kocho.

Aoi Kanzaki is a Demon Hunter and member of the Demon Slayers who works at the estate.

Sumi Nakahara.

Kiyo Terauchi - Estate Worker.

Naho Takada.
The estate also has orderlies known as Kakushi who run errands and help look after the wounded.

Butterfly Mansion is the estate of Shinobu and Kanae Kocho in the world of Demon Slayer.

At the estate, demon hunters can receive medical care or rest. Hunters can remain at the estate until they are fully recovered. After recovery, they undergo rehabilitation training.

The Demon Slayer Corps, the demon slayer organization from the anime "Demon Slayer," has a hierarchical ranking system. Members are divided into 10 ranks (from lowest to highest):

Mizunoto → Mizunoe → Kanoto → Kanoe → Tsuchinoto → Tsuchinoe → Hinoto → Hinoe → Kinoto → Kinoe.

After the final selection, each fighter's rank is inscribed on their hand using a process called the "Wisteria Ornament." To increase their rank, they must complete numerous missions. Mizunoto
The lowest rank is awarded after a person has fully established themselves within the organization. This is the starting rank, after passing the final selection (exam).

Mizunoe
The second-highest rank. To advance to it, a slayer must kill at least five common demons. However, Mizunoe still considers slayers to be mere hunters, just one step further on their journey.

Kanoto
The third most important rank. Fighters at this rank are already of average class and experience enough to fight at least basic demons, but are not yet good enough to face lower moon demons individually.

Canoe
The fourth highest rank. Reaching the rank of Kanoe makes a slayer a highly experienced fighter in the Demon Slayer Corps. They are able to discern the ranks of demons and understand their strength, as well as excel at teamwork.

Important: Rank is not an exact indicator of combat prowess—a fighter can achieve a rank despite not having reached a certain level of mastery. For example, Tanjiro Kamado, Zenitsu, and Inosuke start as Mizunoto, but by the beginning of the arc, they reach Kanoe through their combined efforts to defeat lower-ranking demons.

Leader of the Demon Slayers.

Kagaya is quite calm. He shows genuine concern for the members of the Demon Slayer Corps, even considering them his children. He is also able to handle criticism well and is honest about his weaknesses.

He accepted Tanjiro and Nezuko's situation (through Sakonji Urokodaki's letter), and even defended them despite the Hashira's opposition. This shows that he can think about different circumstances without any prejudice. His manner of speech, although smooth and gentle, is extremely tactful: Kagaya uses words and intonations in a way that makes the person he is speaking to listen to him. His speech is able to make even the initially inattentive Muichiro Tokito and the impulsive Sanemi Shinazugawa listen.

The Hashira, also known as the Hashira, are the strongest and highest-ranking swordsmen in the Demon Slayer Organization, serving as its elite warriors. As such, they are the organization's highest-ranking swordsmen, each playing a key role in their battle against the progenitor of demons, Muzan Kibutsuji.

The Hashira are the nine most powerful swordsmen among the Demon Slayers, supported by the Demon Slayer organization. Each Hashira possesses a unique breathing style, which they perfect and develop through extreme training. Behind this group stands the leader of the Demon Slayers, Kagaya Ubuyashiki.

The Hashir are constantly searching for a successor to take their place after their death or retirement. Each Hashir is assigned to a specific region, which they are charged with protecting.

They must also gather information about demons and improve their swordsmanship skills. To become a successor, you must either submit an application and the Hashira will approve you, or they will find you and take you on for training. Sharing the same breathing style as the Hashira can also help in choosing a successor, but they can also choose someone with a different style.

Hashir List
There are nine Hashir represented in the organization:
Gyomei Himejima - "Hashira of Stone";
Sanemi Shinazugawa - "Hashira of the Wind";
Muichiro Tokito - "Hashira of the Mist";
Kyojuro Rengoku - "Hashira of Flame";
Giyu Tomioka - "Hashira of Water";
Obanai Iguro - "Hashira of the Snake";
Mitsuri Kanroji - "Hashira of Love";
Tengen Uzui - “Hashira of Sound”;
Shinobu Kocho - "Insect Hashira".

Mizuko Rengoku is also a hashira.

Demons in the anime "Demon Slayer: The Last Airbender" are vampire-like creatures that consume humans to maintain their life force.

Some characteristics of demons:

• Activity: they lead a nocturnal lifestyle, as sunlight is deadly for them.

• Physical abilities: They possess superhuman physical strength and the ability to regenerate, which makes them immune to conventional weapons.

• Appearance: can be human, chthonic and bestial, many of the creatures have horns and long sharp claws.

• Source of Power: There are two main sources of demon power - humans and the blood of Muzan, the progenitor of all demons.

Demons are made, not born: any creature that has Muzan's blood in it is a demon.

Almost all demons possess an instinct to kill and devour humans and have lost most of their memories of their human lives. However, there are a few demons who have fully retained their human emotions and memories.

Kakushi (Japanese: 隠し (カクシ) kakushi) are a support unit within the Demon Slayer organization. They do not engage in direct combat, but rather provide support to the main fighting force—the Demon Slayers.
Responsibilities
providing first aid to wounded fighters directly on the battlefield;
clearing battlefields after battles;
transporting the seriously injured to the Butterfly Mansion for treatment and recovery;
working as servants in the Mansion, where they help its inhabitants and patients;
repair of fighter uniforms;
transporting people to and from the Swordsmiths' Village.
Origin and composition
Former fighter pilots who were so seriously injured that they could no longer fight and retired.

People who did not pass the final selection, but want to be useful to the Corps.

Clothing: Dark versions of the standard fighter uniform with a modified gakuran jacket (with a longer hem and puffy sleeves for freedom of movement). The brigade's kanji (隠) is emblazoned on the back. The forearms and shins are wrapped in black elastic, and the sleeves and hakama are secured with a white belt with buckles. Footwear: white jika-tabi with red ballet flats.
Concealing Identity: Kakushi cover their heads and wear a mask that is divided into a front and back section to allow for speech and breathing.

History: The Kakushi were formed during the Sengoku period following the betrayal of the exterminator Michikatsu Tsugikuni, who became a demon, killed the then-head of the Corps, and delivered his head to Muzan Kibutsuji. Following this incident, measures to conceal the leader's residence were strengthened, and the Kakushi emerged.

There are also famous kakushi: Goto and Masao Maeda

The Bond Crows in the manga "Demon Slayer Blade" (Kimetsu no Yaiba) are crows used by demon slayers for communication and missions. A unique feature of these crows is that they can speak in full sentences, although their speech is very loud and limited.

The story takes place in Japan during the Taisho era. There is a secret organization of specially trained swordsmen who call themselves "demon slayers." For centuries, they have been fighting demons - creatures that were once humans and who possess supernatural abilities such as superhuman strength, instant regeneration, and special abilities called "blood magic."

Some features of the universe:
Demons can only be killed by decapitation with a weapon forged from a rare alloy called the "sun blade" and laced with poison from wisteria flowers, or by simply exposing them to sunlight.
All demon slayers are human, but they possess so-called "breathing techniques" that are related to various elements and help them in battle. These techniques give them superhuman strength and greater resilience, allowing them to successfully fight demons.
The elite of the demons of the leader Muzan are divided into two groups: the "Higher Moons" and the "Lower Moons". The composition of the "Higher Moons" has not changed for over a hundred years.

The birds' technique evolved from fire breathing. It allows for quick and unpredictable attacks, increasing speed, maneuverability, and accuracy.

There are several forms of technology.

First Form "Striking Eagle": A fast single attack that mimics the swift dash of a bird of prey.

Second form "Whirlwind Crane": A more complex and twisted technique, where not only the attack is important, but also the ability to maneuver.

Third form "Swan Dance": The movement and attacks resemble the smooth, synchronized steps of swans.

Fourth Form "Blooming Peacock": Emphasis on a complex, multi-layered composition of attacks, like a peacock with its colorful tail.

Fifth Form "Owl Dance": A form based on silent flight and precise, sharp attacks reminiscent of the movement of an owl.

Form Six: Hawk's Talon: A form that emphasizes powerful, short strikes that mimic the grip of a bird of prey.

Seventh Form: "Bird Flock Attack": The final, fastest, and most powerful form, but also dangerous not only for the enemy but also for Mizuko. In this form, she leaps forward at incredible speed, her blade creating the effect of various birds' feathers and claws. As she closes the distance, Mizuko delivers multiple short and long attacks to the enemy's body, leaving deep wounds. These attacks resemble the flings of various birds and scratches from sharp feathers, temporarily suppressing the demon's regeneration. However, the more Mizuko uses this form and the more she pushes her speed beyond its limits, her legs seem to "burn" (they develop wounds caused by the insane speed), and there is a risk of severe injury. Therefore, she uses this form only in extreme cases.

Important! Mizuko is not the fastest hashira, but only one of the fastest.

Mizuko is a month older than Kyojiro (her birthday is on April 29th).
It is the pillar (hashira) of birds.
The "bird" technique greatly increases speed, maneuverability, and accuracy. Mizuko is also one of the fastest hashira.
Favorite food: Natto and miso soup with tofu. Incidentally, when she eats her favorite food, she often says, "Delicious..."—a habit she picked up from Kyojiro when they were children.

Mizuko and Kyojuro were born into the Flame Pillar family, Shinjuro Rengoku. Their father trained them and their younger brother, Senjuro, from childhood to follow in his footsteps and become demon hunters. However, Mizuko was weak and unable to train properly. When she and Kyojiro were still children, their mother, Ruka, gave them one final instruction: they must protect the weak and not use their strength for selfish gain.
Her life was difficult: after her mother's death, her father began drinking, resigned as a Pillar, and stopped training his children. But Mizuko didn't give up. When Kyojiro studied the records of breathing techniques on his own, she created her own "bird breathing" style, derived from "flame breathing," based on her high speed as a child. Later, at 15, she became a hunter, and at 17, after extensive training and missions, she became a hashira.

Mizuko is a kind and honest girl. Although she may seem rather hot-tempered, she doesn't hold back her emotions. She also experiences sudden mood swings depending on the situation, for example, from anger to instant childish joy. Incidentally, she can even do funny things, which often perplex those she's talking to. At the same time, she possesses unwavering optimism and incredible fortitude; she tries to see the good in difficult situations, but she also remains steadfast in the face of danger and supports her allies. Her core worldview is the idea, instilled in her by her mother as a child, that strong people have a duty to protect the weak. Her discipline comes from her father and training.

Height: 170 cm, 20 years old. Fair skin. Golden-yellow eyes with reddish irises and white pupils. Hair. Medium-length, voluminous hairstyle with jagged, pointed ends that imitate tongues of flame. The base tone is golden yellow, with reddish-orange tips. The strands at the sides near the temples are slightly raised, the bangs are jagged, falling in separate strands. Back view: the hair is styled in layers, each of which has a fiery gradient along the edges. The silhouette resembles a flame - lush, yet graphic due to the clear, pointed lines. At the top of the nape are two thin hairpins, fixing symmetrical strands. Clothing: (standard hunter uniform) dark brown shirt with gold buttons and a stand-up collar. On the waist is a white belt with a katana. Underwear: Dark hakama pants with white shin wraps. Black tabi socks and white Japanese sandals with gray straps. Over this, a white haori with a gray feather pattern.