Akaza

Master Hand-to-Hand Combatant: Akaza is an extremely powerful and skilled unarmed fighter, using close combat as his primary fighting style. Immense Speed: Akaza is extremely fast, as shown during his fight with Kyojuro, when Tanjiro states that they were moving so fast that he could not follow their movements. Despite this, Akaza did not fight Kyojuro with a serious attitude. Immense Strength: Akaza possessed immense physical strength, as shown when he easily split Giyu's sword in half with a single side kick, despite the latter swinging his sword downwards. He could easily destroy the head of Upper Rank 2 Doma. With his Blood Demon Technique, he is capable of creating a crater on the ground by punching it. Enhanced Regeneration: Akaza had incredible regeneration. He was able to regenerate from wounds inflicted by Tanjiro and Rengoku, as well as limb loss inflicted by Giyu, without much effort. During his battle against Giyu and Tanjiro, his regeneration was further enhanced. He was able to survive even after his head was cut off, and then grow a new one.

Unusual Strength: At the age of 11, he could defeat grown men in combat, and at 18, he was able to easily decapitate, dismember, and mutilate 67 armed adult kendo masters with his bare fists, to the point that even Muzan thought it was a Demon who performed these feats. Enhanced Durability: Before becoming a demon, Akaza (Hakuji) demonstrated superhuman durability at the age of 11, where he endured beatings that would render an adult human petrified (100 blows), thus earning the name "Demon Child" (people nicknamed him this because he had fangs from birth). Soryu Style (素流そりゅう式しき, Soryū Shiki?): He was taught a martial arts style by Keizo while living with him and caring for Koyuki. He used it to easily kill kenjutsu students, and it likely inspired the destructive killing style he used when he became Akaza.

Blood Demon Technique (Kekkijutsu?): Akaza possesses a unique ability called the "Deployment Technique" (Jutsushiki tenkai?). By deploying the technique, he can use shockwave-like attacks and locate his opponents by sensing their killing intent.

Destructive Target Smashing (破は壊かい殺さつ, Hakai satsu?): A martial arts form that is likely a mix of Soryu style and Akaza's demonic abilities.

Compass Needle (羅ら針しん, Rashin?):[3][4] Akaza creates a compass beneath himself with numbers ranging from 1 to 12, allowing him to sense battle auras, helping him predict his opponent's future attacks. Free Style (空くう式しき, Kūshiki?):[] By striking the air, Akaza unleashes a volley of attacks over long distances. Fighting Style (乱らん式しき, Ranshiki?):[][] By slashing forward, Akaza creates a powerful shockwave directed forward. Destroying Style (滅めっ式しき, Messhiki?): An explosive jump followed by a punch. Double Demonic Wick (鬼き芯しん八や重え芯しん, Kishinya eshin?): Akaza punches the air with both hands simultaneously, creating two powerful shockwaves. Leg Style (脚きやく式しき, Kiyakushiki?):[10] Attacks that use the legs. Signature Kick from Below (冠かむろ先さき割わり, Kamuro saki wari?)[10] An upward kick used for attacks from behind. Light Stream Kick (流りゆう閃せん群ぐん光こう, Riyūsengunkō?):[11] Several rapid kicks, each of which creates a powerful shockwave. Thousand Flying Star Ring (飛遊ひゆう星せい干せん輪りん, Hiyūseisenrin?):[12] A sharp kick from below upwards. Crushing Strike (砕さい式しき, Saishiki?):[13] Techniques that involve a strong strike from above. Ten Thousand Leaves of Shining Willow (万まん葉よう閃せん柳やなぎ, Manyōsen yanagi?):[] A downward strike that sends a powerful shockwave into the ground, damaging it. Final Style: Blue-Silver Turbulent Sunset (終しゆう式しき 青あお銀ぎん乱らん残ざん光こう, Shiyūshiki Aoginranzankō?):[] Incredibly strong and fast strikes, attacking chaotically in all directions.

As the holder of the title of "Upper Moon Third", Akaza possessed immense power, being able to defeat Kyojuro Rengoku, the Flame Pillar, as well as several former Pillars, according to him. He was later able to fight on equal terms with Tanjiro and Giyu, even when they were both using their Demon Slayer Marks and Tanjiro was using the Dance of the Fire God. If he had not lost the will to continue fighting, he would have likely killed both of them. Another testament to his power is that he is the fourth most powerful Demon in the series to not have killed or eaten any women, which drastically hindered his growth as a Demon. It is safe to assume that Akaza would have been much stronger and likely of a higher rank within the ranks of the Twelve Moons Demons if he had not limited himself to killing only male humans.

Hakuji (Akaza, as a human) cared for his ailing father for a long time. To pay for his medication, he went out into town to rob pickpockets. This could have led to beatings from the magistrate, but he nevertheless continued to steal until his father hanged himself. In a letter he left, he stated that he wanted Hakuji to live a full life and that he did not want to take any medication if it was the result of stealing.

With numerous criminal tattoos, Hakuji was eventually exiled from Edo, and it was then that he met Keizo, the owner of a dojo with no students. Keizo decided to take Hakuji under his wing so he could care for Koyuki, Keizo's ailing daughter, after her previous caretaker (her mother) drowned due to stress. Hakuji eventually cared for Koyuki until, three years later, she was well enough to stand and perform housework. He also trained as Keizo's apprentice in the Soryu style, which healed his soul.

Eventually, Keizo asked Hakuji to take over the dojo's duties and become Koyuki's husband, to which he agreed. However, after telling his late father about his marriage, he was informed that someone from the dojo's neighbors had poisoned Koyuki and Keizo. Enraged, Hakuji cold-bloodedly entered the dojo and killed everyone present with his bare hands. This incident attracted Muzan's attention, and it was then that he transformed Hakuji into a demon in an attempt to create twelve of the most powerful demons.

Akaza is a strong, stubborn, and impulsive demon who loves to fight, especially hunting down strong demons or Pillars. He looks down on anyone he considers weak, but shows genuine respect for strong individuals, regardless of race. He also gets angry and annoyed easily, especially by the whims of Doma and weak humans. Despite his passion for fighting and stubbornness, Akaza knows when to retire.

As a human, Hakuji had a stubborn personality, a big heart, and resilience. He valued others more than his own well-being, and felt somewhat resigned to a life full of empty words and promises.

Akaza appears as a young man with an athletic build. After his transformation into a demon, his skin turned white and he gained many blue stripes on his body, reminiscent of the tattoos he had as a human. He has yellow eyes with blue sclera and pink eyelashes, as well as short pink hair and eyebrows.

He wears a short, light purple, sleeveless haori and wide white pants, tied with a light blue belt.

When Akaza was human, he had black hair and light blue eyes, as well as unusual purple eyelashes. He had three stripes tattooed on his arms, marking him as a pickpocket.

He wore a dark grey yukata, and in the Keizo dojo he often wore a keikogi.