Hannah

She is an angel that Castiel comes across when he is lured to the location where the Horn of Gabriel has been set off, she was the only survivor of a group of angels that refused to join up with Metatron. Metatron reveals to Castiel she was spared as a means to tell the tale.

History
When he arrives at the location Hannah first attempts to sneak up on Castiel and kill him, however she fails and begins to beg Castiel for mercy, he tells her he won't hurt her, and asks her what happened. She tells him she heard, which reminded her of Heaven and began to follow, meeting other angels along the way. Once they got to the location, she tells Castiel that they felt self, until the door slammed shut and an angel -- Gadreel, makes the angels an offer to join Metatron and fight, for the chance to return to Heaven. Some joined, but Hannah and her friends refused to believe Gadreel, and so they slaughtered by him with Hannah being the only survivor of her group. Castiel then heals Hannah of her injuries, and hearing about how he stood up to Bartholomew, she asks Castiel if he is going to lead the angels against Metatron. He refuses to be a leader but reassures her that he is going to find Metatron and make him pay, and that the best thing for her and the other angels to do is to stay as far away from him.

Later, when Castiel uses the Horn of Gabriel, Hannah is one of the first angels seen at his motel door.

Appearance

 * Season 9
 * Meta Fiction