Hannah

Hannah is an angel that fell from Heaven by Metatron and eventually allies herself with Castiel and appears to be his second in command. She has also seemed to developed romantic feelings towards Castiel.

History
In "Meta Fiction," when Castiel arrives at the location where a strange sound drawing angels in comes from, 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 a noise which reminded her of Heaven and began to follow it, meeting other angels along the way. Once they arrived at the source, she tells Castiel that they felt safe until the door slammed shut and an angel, Gadreel, made them an offer to join Metatron and fight for a chance to return to Heaven. Some joined, but Hannah and her friends refused to believe Gadreel and he killed them, with Hannah being the only survivor. Castiel then heals Hannah of her injuries, and, upon hearing of 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 as possible. Metatron later reveals he had Gadreel left Hannah alive so Castiel would learn of what happened. Later, when Castiel uses the Horn of Gabriel, Hannah is one of the first angels seen at his motel door.

In "Stairway To Heaven," when Castiel builds an army, Hannah acts as his second-in-command and is shocked by Tessa's accusations that Castiel set up the suicide bomber angels. Hannah forces Dean to disarm himself of an angel blade and is furious when Dean apparently kills Tessa with the First Blade. After Metatron's broadcast, revealing Castiel's dwindling grace and offering amnesty if they abandon Castiel, Hannah is reproachful to learn that Castiel did not disclose the truth with his followers about his grace's condition and their faith in him is shaken. She orders him to kill Dean, in retribution for Tessa's death, in order to prove his dedication to their cause. When Castiel refuses, Hannah abandons him for Metatron with all of his followers.

In "Do You Believe In Miracles?," when Castiel and Gadreel try to sneak into Heaven to find and shatter the angel tablet, the source of Metatron's extensive power, Hannah sees through the deception and locks them in Heaven's dungeon. Castiel and Gadreel try to convince her to help them, but she asks why she should since Gadreel only cares about himself and Castiel lied. Despite Castiel's assertions that killing Metatron will stop the violence, Hannah is unconvinced until Gadreel kills himself to free Castiel, asserting that protecting humanity is more important than anything else. Hannah is finally convinced and at first tries to aid Castiel in finding the tablet by interrogating another angel until he sends her away. After Castiel breaks the angel tablet and broadcasts Metatron's true intentions over 'angel radio', Hannah rushes into Metatron's office with an assemblage of other angels overpowering Metatron, saving and freeing Castiel. Hannah is pleased when Castiel chooses to lock up Metatron rather than killing him and calls Castiel a true leader for it. Castiel informs her he only wishes to be a regular angel. Hannah reminds him that he will soon die unless he replenishes his dying grace.

In "Black", months after Metatron's defeat Hannah was in charge of returning the remaining angels to Earth but two, Daniel and Adina, refused and Hannah sent an angel to talk to them but they killed him. Hannah then sought out Castiel's help but was iritated to learn of his still diminishing grace. When they arrived at the site of the rouge angels Hannah showed signs of concern for Castiel's well being but he insisted that his own well being isn't important. Hannah witnessed Castiel confront Daniel who stated that he just wanted to be left alone but Hannah insisted that they still had a mission. When Adina returned she immediatley took hostiliaties towards Castiel and Hannah and the two female angels lashed out and Daniel attempted to kill Hannah only for Cas to save her by killing him.

In "Reichenbach",

In "Soul Survivor",

Personality
Hannah at first is very loyal to Castiel and sees him as the angels' savior, mainly for standing up to Bartholomew, even when he doesn't think so. When Castiel does establish the faction to face Metatron, Hannah appears to have been made second in command implying that Castiel does trust her somewhat. She also can get angry from angels insulting Castiel as she tries to hurt Tessa disgracing his memory. Hannah can be irritated by humans like other angels but is tolerant to a point, but also finds them interesting as she makes not of one who is kind when she offers to tow her and Castiel's car, but like Castiel in his debut is clueless of human humor and was horrified of a human's sarcastic remark to being a truck driver thank a murderer. She seems scared of Dean Winchester as he gets violent around the other angels, but seems to have no ill-feelings towards Sam. She believe anything can be learned from humans and believes all the emotions they feel are for humans not angels. She also firmly believes in a code as when Dean wants to use violence towards Tessa, Hannah tries to stop him to allow Castiel to do so instead. Her belief in the angel's code however can block her judgement as she was willing to kill two angels who didn't want to return to Heaven until Castiel stopped her. It has also been shown that she may have deeper feelings for Castiel, possibly romantic but Castiel dosen't like her in that way, as she was quick to deny any involvement between him and her to a human woman who assumed so, and willing to hurt Metatron when he made a sarcastic comment on him and her, and she was also considering releasing Metatron to get Castiel's grace back. She is a pain in the ass and deserves to die:)

Powers and Abilities
Hannah possesses the standard powers of a common angel. However, as Castiel's second in command, she possibly has powers that surpass those under her.
 * Angelic Possession - Hannah needs to possess a human vessel to physically interact on Earth. As an angel, she also needs the vessel's consent.
 * Immortality - As an angel, Hannah is immortal, can live forever and never die. She is also immune to aging, diseases, toxins, poisons, and sickness.
 * Invulnerability - Hannah can not be killed by any conventional weapons. She can only be killed by something angelic.
 * Super Strength - Being an angel, Hannah is stronger than humans, spirits, monsters, and most demons.
 * Healing - Hannah was able to heal Castiel's wound from Adina.

Appearances

 * Season 9
 * Meta Fiction
 * Stairway To Heaven
 * Do You Believe In Miracles?
 * Season 10
 * ​Black
 * Reichenbach
 * Soul Survivor

Trivia

 * Since Black it has been shown that Hannah seems to have an attraction towards Castiel which she doesn't seem completely aware of, even grabbing his hand which is something people who have an attraction to each other do in times of distress. Adina and Crowley have both also noted the attraction, and Castiel himself seems to be aware of her attraction towards him, though he does not currently show signs of romantic attraction toward her.