Akaza is a stubborn, harsh, short-fused and bloodthirsty fighter who desires to fight the strong, respects the strong and loathes the weak. His distain for the weak stems from when his teacher and fiancé were poisoned by a rival dojo who was unable to defeat Akaza in a fair fight when he was Hakuji and his obsessive pursuit of strength comes from his buried desire to help his loved ones but has been twisted by his demonic transformation. He also shares ill feelings for his fellow kizuki and sees them as his own rivals, being especially hostile towards Kokushibo, the Upper Rank One, and Doma, the Upper Rank Two, who both held higher ranks than him. He shows a particularly strong interest in powerful opponents and will try to figure out their names as a form of respect towards them and their might. As a result, he remembered the names of every single opponent he fought in his life as a form of respect towards them. In spite of his cruelty and wrath, Akaza had one special code even in his transformed state; he never devoured any women, in spite of the fact that eating females would have actually made him even stronger, and Muzan gave him special permission to do so. He also showed a serious self-loathing tendency, valuing others above the good of himself. All of his personality was influenced by his past life and the remnants of his own humanity, showing how dark and miserable his traumatic experiences were, to the point of being forced to become a demon and joining Muzan. During the Infinity Castle Arc, when he fought against Giyu and Tanjiro, his memories of his old life gradually returned through Tanjiro, whose philosophy reminded him of his old master and his promise to be strong for others. After his beheading by Tanjiro, he was initially determined to destroy them both until Koyuki reminded him of his true self. He now regretted the path he had chosen and was grateful to Tanjiro for the realization. He destroyed himself to stop his regeneration and finally die. In his final moments, he chose his father and his teacher and Koyuki over Muzan, who wanted to manipulate him again, and apologized to them. He died in acceptance of his fate. His soul ended up in Hell, but was reunited with his loved ones and finally found peace. "I'm sorry. I'm sorry. I'm sorry I couldn't... Keep our promise. I couldn't keep anything! Forgive me. Forgive me. I beg you. Forgive me!"