Short Answer 
Gilgamesh is portrayed as an epic hero through his superhuman strength, particularly his victory over Humbaba, and undergoes a significant transformation in his quest for eternal life, ultimately realizing the importance of legacy and friendship. As king of Uruk, he exemplifies ideal leadership by protecting his people and pursuing wisdom and strategic guidance.
Step 1: Superhuman Abilities
Gilgamesh is depicted as an epic hero largely due to his superhuman strength and courage. He showcases this remarkable prowess during his intense battle against the monstrous creature Humbaba in the Cedar Forest. Such feats emphasize his physical dominance, as he is described as strong as a wild bull and brave like a lion.
Step 2: Transformation and Wisdom
Throughout the story, Gilgamesh experiences a profound transformation that highlights his development as a character. Initially driven by a quest for eternal life after the death of his companion Enkidu, he learns that the essence of immortality is found in the memories and legacies left by one’s deeds. This journey is crucial in shaping his understanding of mortality and the significance of friendship.
Step 3: Leadership and Protection
As the king of Uruk, Gilgamesh embodies the qualities of an ideal leader through his dedication to the well-being of his people. He constructs mighty walls around the city to protect against threats, demonstrating his commitment to their safety. Additionally, his pursuit of knowledge and strategic decision-making, including seeking advice from Utnapishtim, further illustrates his heroic leadership and care for his kingdom.