Akaza

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

Red Light District Arc
Akaza appears before Muzan Kubitsuji and reports to him that: 1) He could not find the Blue Spider Lily and 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.

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 Rengoku Kyoujurou'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.