The character from Norse mythology destined to cause the end of the world is Ragnarok, specifically represented by the god Loki and his monstrous children, such as Fenrir and the Midgard Serpent. Loki's betrayal triggers a series of catastrophic events leading to the death of numerous gods. This myth underscores the themes of chaos, betrayal, and the inevitability of fate. Ragnarok symbolizes not only destruction but also the potential for rebirth and renewal, mirroring natural cycles in the world.