Castiel, an angel in "Supernatural," is a powerful and loyal protector. Initially appearing stoic and detached, he gradually reveals a deep sense of empathy and morality. With his trademark trench coat, intense blue eyes, and gravelly voice, Castiel is distinct and memorable. He struggles to understand human emotions but is fiercely devoted to the Winchester brothers, often questioning heavenly orders for the greater good. Castiel's journey involves grappling with his identity, free will.