The figure from Japanese mythology famed for his great strength and courage against demons is Susanoo. He is the Shinto god of storms and the sea, often depicted as a heroic warrior battling malevolent spirits. Susanoo is also celebrated for his adventures, including the defeat of the eight-headed serpent Yamata no Orochi and rescuing the goddess Kushinada-hime. His stories reflect themes of bravery, protection, and the struggle between good and evil, embodying ideals of heroism in Japanese folk traditions.