The legendary figure in Norse tradition who sacrificed himself to protect humanity during Ragnarok is Odin. In the final battle of Ragnarok, Odin confronts the wolf Fenrir to save the world from chaos despite knowing the prophecy of his death. His sacrifice is emblematic of the hero's journey and the ultimate fight against evil, illustrating themes of destiny and the cyclical nature of life and death. Odin's actions reflect the deep values of honor, courage, and selflessness in Norse mythology.