Akaza

Akaza was a member of the Twelve Demon Moons, holding the position of Upper Moon Three. While he was human, his name was Hakuji.

Appearance
Demon - Pink hair and eyelashes, yellow eyes, blue marking all over his body, pale/white skin

Human - Black hair, blueish eyelashes, blueish eyes, with three black lines on each arm (criminal marks for Theft)

Personality
Akaza is a strong, stubborn and impulsive demon who enjoys fighting, especially strong demon hunters or Pillars. He looks down anybody that he deems as weak but shows genuine respect for those who are strong - regardless of race - in his eyes. He is also easily angered and annoyed especially by the whims of Doma and weak people. Despite his passion for fighting and his obstinance, Akaza does know when to resign.

As a human, Hakuji possessed the same stubborn personality with a big heart and resilience. He valued others more than his own wellbeing and to a degree feels self-deprecation from having a life full of empty words and promises.

History
Hakuji (Akaza as a human) had been taking care of his sickly father for a long time since he was young. In order to pay for medicine, he would go out in town to pickpocket. This would get him a beating from the magistrate, but he nonetheless continued to steal until his father hung himself. In the letter he left, he stated he wanted Hakuji to live a full life and didn't want to take any medicine if it was the result of stealing.

With multiple tattoos of a criminal, Hakuji was eventually banished from Edo, and that was when he met Keizou, the owner of a dojo with no students. Keizou decided to take Hakuji under his wing so he could nurse Koyuki, Keizou's sickly daughter, after her previous caretaker (her mother) drowned herself due to stress. Hakuji ended up tending to Koyuki until, three years later, she was in good health and could stand and do chores. In addition, he also trained as Keizou's pupil of the Soryu style, which healed his soul.

Eventually, Keizou asked Hakuji to take over the dojo and be Koyuki's husband, to which he agreed. However, after telling his now-deceased father of his marriage, he was informed that someone from the dojo next door poisoned Koyuki and Keizou. Enraged, Hakuji went to that dojo and mutilated everybody there in cold blood. This incident caught Muzan's attention, and that was when he turned Hakuji into a demon in an attempt to create twelve strong demons.

Red Light District Arc
Akaza appears before Muzan Kubitsuji and reports to him that he could not find the Blue Spider Lily and that he took down one of the Pillars.

Demon Abilities
His blood demon technique work by Technique Deployment. After deploying his technique, he can use his ability to create various shock wave-like attacks. He could also track his opponents by tracing their bloodlust

Destructive Kill:
 * Compass Needle - Deploying a compass underneath him with numbers from 1 to 10. It can detect all incoming attacks through sensing battle spirit.
 * Void Style - Punching the air, he creates a powerful multishot shockwave range attack.
 * War Style - Punching in front of him, he creates large shock waves that fly forward.
 * Obliteration Style - An explosive forward jump followed by a punch that was able to go through Kyoujurou Rengoku's Purgatory attack.
 * Leg Style - Techniques where he uses his legs to attack
 * Cap Tip Slice  - A reverse, rising axe kick he can use to attack behind himself.
 * Flowing Light Flash - Multiple, rapid straight kicks that each produce powerful shockwaves.
 * Ring of a Thousand Flying Planets - Rapid, flowing rising kicks that hit an opponent from below.
 * Dual Layered Demon Wick - He punches rapidly with both arms at once, each producing powerful shockwaves.
 * Crush Style - Techniques that involve crushing attacks from above.
 * Willow of a Thousand Flashes - A powerful downward punch that delivers a large shockwave into the ground, causing massive damage to the ground.
 * End Style - Powerful techniques. Presumably Akaza's strongest techniques.
 * Chaotic Blue Metal Afterglow - Incredibly strong and fast blows that attack from every direction at once almost randomly. They created seemingly thin, sharp shockwaves.

Quotes

 * "Elegant!! This is finely crafted swordsmanship! Splendid! Give me your name! What is it!? I want to remember you!" Chapter 148, page 10.
 * "Yes. I'm repulsed by weaklings. They make me vomit." Chapter 148, page 18.
 * "... I don— I... just don't care any... more..." Chapter 155, page 18.
 * "But for over a hundred years, I kept pointlessly murdering over and over again. Yet, at the end of the day, it's just a pathetic, comical, uninteresting story." Chapter 155, page 19.