Douko is one of two survivors from the previous generation of Athena Saints, along with Aries Shion, who is also his close friend. After the war, he was tasked with guarding the tower where Hades Specters were sealed until the next Holy War. Currently, Douko resides at the Five Peaks in China with an orphan girl named Shun-Rei, whom he has taken under his care. He is also the master of Dragon Shiryuu and Ouko, who is a character exclusive to anime. As a father figure to Shiryuu, Douko often imparts his wisdom to him during difficult battles. He serves as an advisor to the main characters and a good friend to Aries Mu, Shion's disciple. In his youth, Douko was more vibrant and impulsive, but after regaining his youthful form during the Hades arc, he has become much more circumspect and mindful due to his nearly three centuries of experience as a Saint.