Akaza

Akaza was characterized as an impulsive, stubborn, and strong Demon with the idea that he should fight strong opponents and enjoy the fight, which was reinforced by the pleasure he took in facing Demon Hunters, especially those who held the position of a Pillar.[12] He despised anyone he deemed weak,[13] but genuinely respected those who were strong in his eyes, regardless of whether they were Human or Demon. Once he met someone he deemed strong, he would demand to know their name and would not stop until he found out.[14] He would remember all the names he had committed to memory as a tribute to their strength.

Akaza had a deep-rooted psychological need to become stronger, and did not get along with his fellow Upper Moons due to viewing them as rivals. He was especially antagonistic towards the two Upper Moons who held a hierarchical position above him, Doma and Kokushibo, lashing out at Doma and vowing to kill Kokushibo.[15] Even after being beaten and decapitated during his fight against Tanjiro Kamado and Giyu Tomioka, he stubbornly remained and continued fighting despite not knowing why he wanted more power.[16]

As a human, Hakuji possessed the same stubborn personality with a big heart and resilience. He valued others more than his own well-being, and hates himself for having a life "filled with empty words and promises."[17] Even after becoming a demon and losing his memories of his human life, parts of Hakuji's memories influence Akaza's decisions; he refuses to devour women, despite knowing it would make him stronger if he did.[18] His hatred towards weak and cowardly people stems from the corruption of his human memories, where a rival dojo poisoned his dojo's well because they were never able to defeat him.[19]

As a Demon, Akaza retained his human appearance[4] and took the form of a muscular young man with fairly light skin similar to a bright white tinged with green. Much of his body was decorated with thick blue lines[5], resembling the criminal tattoos he had when he was human.[6]

Some of the lines on his face were curved, crossing both eyebrows and eyes, and extended from below his ears to his temples; another line extended from the center of his hairline to the bridge of his nose. The lines continued to extend around his body: two lines ran around his neck, and three more lines branched down to his torso; a center line ran directly down his chest to the middle of his stomach; while the other lines that connected to his neck branched off on either side of his chest to join the other two horizontal lines, this same three-line pattern was also repeated around his waist.[7]

The lines that covered the upper part of his torso, extended and then bent straight down each side of his arms, joining with a horizontal line that surrounded his bicep. Below this line, there was another horizontal line and on the sides of this, two straight lines extended that reached the end of Akaza's wrist[8]. On both his hands and feet, it could be seen that all of his fingers were blue and his nails were painted orange[9].

Her eyebrows were thin[3] and black and pink[9]. Her eyelashes as well as her hair, which was short and without bangs and left her forehead exposed[3], were a light pink[5]. Her eyes had fragmented blue sclera and her irises were yellow. On the irises she has a number indicative of her position as the third crescent moon within the Twelve Demonic Moons (参 上弦 (San jōgen,?))[10].