Themes common in hero myths across different cultures include the hero's journey, the battle between good and evil, and the quest for identity. Myths like those of Gilgamesh or the Hercules stories highlight the hero's transformation through trials, often reflecting the societal ideals of bravery, sacrifice, and redemption. These narratives emphasize the importance of courage, perseverance, and moral integrity, serving as inspirational tales that encourage individuals to overcome challenges and grow in their personal journeys.