Akaza, originally named Hakuji, began life as a destitute youth burdened by his father’s terminal illness. Desperation drove him to steal medicine, earning him the scornful title “Demon Child” from villagers. His father’s suicide—fueled by shame over Hakuji’s crimes—plunged him into vengeful brutality until his expulsion from Edo. Salvation came through Keizo, a dojo master who offered discipline and kinship, training Hakuji in martial arts and welcoming him into a fragile family with his daughter Koyuki. Their murders by a rival dojo reignited Hakuji’s fury, culminating in the slaughter of sixty-seven adversaries. Muzan Kibutsuji, exploiting this rage, remade him as Akaza, a demon stripped of human memories. As Upper Rank Three of the Twelve Kizuki, Akaza forged a creed exalting raw power, disdaining weakness and hunting formidable foes. His Soryu-based combat crystallized into the Blood Demon Art “Destructive Death,” channeling explosive shockwaves and lethal precision. Enhanced senses let him dissect opponents’ auras, predicting strikes and vulnerabilities. Paradoxically, he abstained from harming women, an echo of his bond with Koyuki that defied his demonic nature. The Mugen Train clash with Kyojuro Rengoku reshaped Akaza’s path. Captivated by the Flame Hashira’s resolve, he implored Rengoku to embrace demonhood for endless battle. Rengoku’s defiant death and Tanjiro’s condemnation of his cowardice seeded doubt. Years later, battling Tanjiro and Giyu Tomioka, fractured memories of Koyuki surfaced—her spectral plea shattered his demonic resolve. Choosing humanity, Akaza severed his own head, dissolving into death to seek forgiveness alongside Keizo and Koyuki. Akaza’s rivalry with Kokushibo and Doma mirrored his obsession with dominance, a twisted reflection of his human urge to protect. Muzan’s corruption perverted this instinct into bloodlust, yet flickers of Hakuji endured: his refusal to kill women, his final renunciation of demonhood. His existence embodied relentless brutality and latent remorse, a duality etched into his rise and fall among demons.