The main characteristics of a hero's journey as depicted in ancient myths include stages such as the call to adventure, facing trials, receiving guidance, and ultimately achieving transformation. Heroes often receive a call that compels them to leave their ordinary lives, encountering mentors and allies along the way. This journey often comprises challenges that test their resolve and character, leading to self-discovery and growth. The hero returns home, transformed by their experiences, often sharing wisdom or new insights with their community, reinforcing the narrative of personal development and the cycle of life.