A fight against upper moon three Akaza

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Appearance: Akaza was a very muscular young man of average height with skin so fair it appeared bright green-tinged white, decorated by a pattern of thick blue lines, which resembled the criminal tattoos he had as a human. Akaza had short, bright pink hair that fluffed out around his head and inward-tilting yellow eyes with pink eyelashes and blue sclera that somewhat resembled cracked glass. The kanji for Upper Rank (上じょう弦げん Jōgen?) was etched into his right iris, and the daiji for Three (参さん San?) was etched into his left.

The lines on his face curved through each of his eyes from below his ears to over his temples, another blue line running from the center of his hairline to the bridge of his nose, with two more lines running around his neck, three others branching off the lower one to his torso. The middle line ran directly down his chest to halfway down his stomach, and the other two branched off to the sides over each side of his chest to join the two other lines. This same three-line pattern also repeated around his waist. On his arms, lines were running down the front of his shoulders that ran into two more, which went around his biceps before continuing to run down to his wrists, below which each of his fingers was also dark blue with an orange fingernail. His toes and toenails also sharing this unusual appearance as his fingers and fingernails.

Akaza wore little and only sported a short, sleeveless dark purple-pink haori cut off at his waist, left open to expose his chest, and decorated by a square pattern on his back. Below this, he sported a pair of baggy white pants that he rolled to just below the knee with a turquoise rope belt to secure them at his waist, with bright pink tassel ornaments hanging on the front and the back of the rope belt. Akaza preferred to go barefoot but wore a pair of chains of large, round, pink pearls around his ankles.

Personality: Akaza was a headstrong, stubborn, and battle-crazed social Darwinist who enjoyed fighting, especially against strong Demon Slayers. He purposefully drew out fights to savor every moment of it; the Upper Rank tended to become enthralled whenever he was hit by a powerful opponent, not due to masochism but out of a genuine admiration for their skills. Akaza repeatedly complimented his opponents when they unleashed powerful techniques or landed blows on him, usually remarking that their techniques and swordsmanship were magnificent and intriguing. He looked down on anybody he deemed weak, claiming that his skin would crawl at the sight of them. He genuinely respected those who were strong in his eyes, demanding to know their names, and would not stop until he found out; he remembered all the names of strong opponents of the past and committed them to memory as a tribute to their strength.

Akaza also presented an opportunity for those he recognized the strength of to become demons, believing that preserving their refined techniques and skill was right and feeling pain watching the deterioration of those blessed with extraordinary gifts as they age, and going so far as to kill them to preserve their magnificent skill himself should they decline his offer to become a demon. He also did not discriminate against strong warriors who were weak before, as shown when he praised and complimented Tanjiro Kamado despite initially attempting to kill him over how weak he was during their first encounter, even going so far as to thank Kyojuro for Tanjiro's growth. Akaza believed strongly in social Darwinism, believing that the law of nature dictates that all weaklings shall be eliminated.

Akaza had a deeply rooted psychological need to become stronger, and while he usually respected the strong, he did not get along with his fellow Upper Ranks, seeing them as his rivals.[9] He was especially antagonistic towards the two Upper Ranks above him, Doma and Kokushibo, lashing out at Doma[10] and vowing to kill Kokushibo.[11] Even after being beheaded during his fight against Tanjiro and Giyu Tomioka, he stubbornly held on and continued to fight, remarking that he must become the strongest no matter what, to the point of overcoming all demons' shared weakness of decapitation by a Nichirin Sword through nothing but sheer willpower and resolve.[12] It was later revealed that Akaza's desperate and stubborn pursuit of strength was a corruption of his human memories: trying to heal his sick father and protecting those he loved, namely his fiancée Koyuki and his master Keizo.

Akaza held a deep hatred for his human life, believing his past was absolutely worthless, and becoming enraged at anything that reminded him of it, such as Tanjiro's view of how the strong should help the weak and Giyu's unwavering resolve reminding him of Keizo. In the former instance, Akaza was so irritated by the unintentional reminder of Keizo that he stopped his usual perky demeanor when fighting and became dead-serious in his efforts to kill Tanjiro. During both instances, he reacted negatively due to his own grief of not being strong enough to protect Keizo and Koyuki despite his heartfelt promises that ultimately "amounted to nothing", which led to his obsession with becoming strong.

As a human, he possessed the same stubborn and resilient personality. However, he also had a noble, kind, and even honorable side. The crimes he committed were only driven by sheer desperation to obtain money for his father's medicine. Despite enduring numerous beatings, Akaza remained resolute, expressing his willingness to endure them for a hundred years if it meant his father's recovery. This unwavering determination showcased his deep prioritization of his loved ones' well-being over his own. Furthermore, his selflessness extended to his care for Koyuki, whom he nursed without any prior connection, declining her offer to attend the fireworks display in favor of tirelessly tending to her.

Even after becoming a demon and losing his memories of his human life, aspects of his humanity continued to linger and influence his decisions. He refused to eat or kill women, despite knowing it would make him stronger if he did so, because of his memories of Koyuki.[13] This juxtaposes him with Doma, who was very enthusiastic about eating women due to their nutritional value. Additionally, her name and hairpin influenced the shape and design of his Compass Needle technique, the fighting style he uses as a demon was the Soryu style Keizo taught him, and the naming of his attacks were based on fireworks, a reference to Akaza's promise to take Koyuki to see the fireworks after she was healed. His targeted hatred of weak people and belief in social Darwinism stemmed from a corruption of his human memories, where a rival dojo poisoned his dojo's well because they were never strong enough to beat him.[14]

After recalling the entirety of his past, Akaza regretted his actions both as a human and a demon. He realized he had never respected his father's words to live an honest life and tainted Keizo's Soryu Style by using it to murder others. Most of all, he hated himself for the times he was not there to save or protect those he loved, and that he really wanted to kill himself all along. Knowing that the people he wanted to protect had long since died, Akaza lost the will to continue fighting as his pursuit of strength was already for naught, and he decided to end his own life. In his final moments, Akaza showed that he still had his humanity left in him, remarking that Tanjiro's technique was magnificent and that he had lost fair and square, even smiling and feeling gratitude towards him for reminding him of the one thing he was truly trying to achieve.

Upon destroying his own body, Akaza attempted to fight off his body's natural instinct to heal, even ripping off pieces of his flesh in acceptance of his defeat by Tanjiro. As he sat down and saw the spirits of his father and Keizo, he immediately casted aside thoughts about his coming demise by instead asking about them and apologizing for his own failures in life. While comforted by their reassurance that they would never abandon him, he momentarily lost sight of his final goal with Muzan's sudden appearance, as he attempted to bring his subordinate back into his control, showing how deeply ingrained his singular objective to become stronger was in him. As he healed even quicker in a final promise to never lose his loved ones again, it was only with the reassurance from his lost fiancée Koyuki, telling him he has done enough, that he was able to push aside the Demon King's influence and revert back to Hakuji: a loyal son, a dutiful student, and a loving husband. As he broke down in tears in Koyuki's arms, incessantly apologizing about the times he has failed to save them, Akaza was finally able to relent and stop his regeneration completely, accepting his disintegration whole again in spirit with his lost family