Fallen Angels

Name
Actor	Various
Dates	Created before Humans but fell after the creation of humanity
Location	No fixed address
Occupation	Archangels and Angels
Episode(s)	Season 4, Season 5, and Season 7

It's difficult to distinguish between a 'fallen' and a 'rebellious' angel in Supernatural. Fallen Angels are those that have defied Heaven's principles and laws, and leave The Host of Heaven permanently. They may be cast out or may leave on their own.

Rebellious angels are those that have questioned or disobeyed orders from their superiors, in particular Michael. They may have created a more personal and individualized agenda. These angels may experience a demotion from their original ranks in the angel hierarchy, and would then be placed in a lower angelic class. True rebellion, meaning outright disobedience, is considered an angelic "murder one" according to Anna. It is closely associated with falling, and can occur for a variety of reasons.

Fallen Angels

Lucifer was expelled from Heaven by God and eventually cast into Hell by Michael. His contempt for humanity and the creation of Lilith, the first demon, led to his fall.

Anna chose to relinquish her Grace, then fell to Earth and was born as a human. She had grown tired of her post and wanted to experience real emotion. Even after regaining her Grace she remained a Fallen Angel and on the run until she was captured and then later killed by Michael.

Castiel confessed in 4.07 It's The Great Pumpkin, Sam Winchester that he had trouble telling what was right and what was wrong. He was later placed under Uriel's command by his superiors for becoming too close with the Winchesters. When he tries to give Dean a warning in 4.20 The Rapture, he is forcibly returned to Heaven and punished severely. He obeys Heaven for a while, but becomes a rebel when he banishes Zachariah and takes Dean Winchester to stop Sam from killing Lilith. He is then cut off from Heaven and gradulaly loses his powers. He eventually loses all of his powers and briefly becomes mortal. He is eventually reinstated after the imprisonment of Michael with even greater power, but his subsequent partnership with Crowley, his brief reign as the ruler of Heaven, and the insanity resulting from his efforts to help Sam cause Hester to describe him as "fallen in every way" and he is apparently now classed as a Fallen Angel, though he still retains his powers unlike the last time he Fell. As such, he is able to give his blood to Sam and Dean to create a weapon against Leviathans when the blood of a Fallen Angel is needed.

Rebellious Angels

Uriel supported the release of Lucifer, but this was either overlooked by or hidden from his superiors.

Gabriel voluntarily exiles himself from Heaven and retreats to Earth. He says that he grew tired of the warring between the other archangels.

Balthazar is another voluntary exile, who stole weapons from Heaven when left. He hides on Earth, but eventually rejoins the angels for a time to fight with Castiel against Raphael.