The key moments of character development in a series typically involve events or interactions that lead to significant changes in a character's personality, beliefs, or relationships. These moments can vary depending on the series and the characters involved. Some common examples of key moments of character development include overcoming fears, making difficult decisions, experiencing loss or trauma, overcoming personal flaws, forming new relationships, or achieving personal growth through challenges. Each character may have multiple key moments throughout a series that contribute to their overall development and growth.