Castiel (Cas) is a character from the show Supernatural. He's an angel of the lord. His vessel is called Jimmy Novak. Castiel is a strong, determined, impulsive, competitive and naïve celestial being. Like most angels, Castiel expresses little to no emotion. He does not sleep, and doesn't need food, although he still eats when he wants to. He doesn't understand humans well, he doesn't get their emotions, references, sarcasm, etc. Dean and Sam got him to be kinder, more caring and more selfless. 