Akaza is a major antagonist in the anime series 'Kimetsu no Yaiba' (Demon Slayer). As an Upper Rank Three demon of the Twelve Kizuki, he is one of the most powerful demons under Muzan Kibutsuji. Known for his exceptional martial arts skills and desire for battle, Akaza is a formidable opponent to the series' protagonists. His past as a human named Hakuji, who was driven to despair and transformed into a demon, adds depth to his character. Akaza's encounters with Tanjiro and the Hashira showcase his strength and complexity.