"I was stationed on Earth 2,000 years... just... watching. Silent... invisible... out on the road... sick for home...waiting on orders from an unknowable father I can't begin to understand." Anna to Dean

Anna Milton was a fallen angel who became the human daughter of Richard and Amy Milton by removing her grace. Due to her newly reawakened ability to hear angels speaking, she was pursued by demons and angels alike. Sam and Dean protected her until she managed to regain her grace and fend off her pursuers herself, even briefly becoming lovers with Dean. Due to Castiel's betrayal, the Host of Heaven eventually captured Anna and took her back to Heaven. She returned to Earth in The Song Remains the Same with the intent to prevent The Apocalypse from having occurred by killing John and Mary Winchester to retroactively erase Sam and Dean Winchester from existence. She was killed by Michael to protect the Winchesters.

Anna's true form was composed of bright light that blinded and could even kill humans upon direct eye contact; she also had wings, as seen when right before she vanished after regaining her grace. Her human body was that of a pale-skinned young woman who was 5'6" with long red hair, wide hazel eyes, and small moles on her cheeks. Her hair was a very dark, vivid shade of red which had lightened to auburn by the time she reappeared, Anna wore a pair of white and blue scrubs at Connor Beverly Behavioral Medicine Center. Once she escaped the mental institution, she began wearing a frilly button-down white shirt and jeans with a green jacket, the last of which she later swapped out in favor of a navy coat that went down to mid-thigh., She is now walking in the forest