After he was killed by Raphael, Castiel was resurrected by God and joined Sam, Dean and Bobby Singer in a quest prevent the brothers from becoming the vessels of Michael and Lucifer. When the Apocalypse was averted, he was again resurrected with new powers, being promoted to Seraph. He then started a civil war in Heaven to prevent Raphael from restarting the Apocalypse, Thinking he could not be outsmarted by a demon, Castiel teamed up with Crowley to claim the souls of Purgatory. He ended up betraying Crowley and absorbed all the souls, resulting in his powers reaching the level that is much higher than an archangel, but at a high price: the powers that the evil souls granted him had warped Castiel's mind, causing him to proclaim himself as the new God.
Castiel later agreed on the advice of Dean to release the souls back into Purgatory. While seemingly successful, it turned out that one of the most powerful entities, the Leviathans, from Purgatory held on to Castiel, and overpowered and took control of him. When the Leviathans leave to take over new forms, Castiel was presumed dead but survived – apparently resurrected by God yet again. Dean later accidentally finds Castiel as an amnesiac healer called Emmanuel. After taking on Sam's madness and experience in Hell in order to save the Winchesters and redeem himself for what he did to Sam, Castiel had become insane and fell into a coma. However, he awakens and his sanity is returned to an extent when a signal was sent to all angels upon the discovery of the Word of God and the appointment of a new prophet. He then aids the Winchester brothers against Dick Roman, only to be transported to Purgatory with Dean.
While Dean returns, Castiel has not returned to him. While his condition is initially unknown, it's revealed that he spent most of his time running from Leviathans and that he didn't escape Purgatory with Dean as he had planned to stay as a form of penance. However, he was eventually released from the monster realm by an incursion of angels under the orders of a mysterious but powerful angel named Naomi and would rejoin the Winchester brothers and tried to become a hunter himself. But after a long while, Castiel learned that Naomi has been controlling him ever since she got him out of Purgatory and compelling him to find the angel tablet, at any cost, even going as far as killing Dean. When he almost did so, after that, Castiel then teamed up with Metatron when the angel convinced him to help him close the gates of Heaven. So after collecting the heart of a Nephilim and the bow of Cupid, Metatron is eventually captured by Naomi but escapes and kills her, only for Cass to discover Metatron's betrayal and plan to cause all angels in Heaven, even the imprisoned ones, to fall to Earth.
Castiel's Grace Necklace
After being stripped of his grace by Metatron in order to expel all angels from Heaven, Castiel spends the next three months on Earth as a human. After being captured and tortured by an angel named Malachi, Castiel steals the grace of Theo and returns to his original status as an angel (previously being promoted to a Seraph). Castiel later assists Dean with expelling the angel Gadreel from Sam and heals Sam's wounds. After Dean leaves with Crowley to find a way to defeat Abaddon, Castiel also leaves to begin a search for Metatron and Gadreel while being pursued by other angels and eventually kills rebel leader Bartholomew and assumes command of his faction but a deception of Metatron's makes him lose his army but instead teamed up with angels Gadreel and Hannah to infiltrate Heaven and destroy the angel tablet, cutting off Metatron's power to allow Dean to kill him. Though successful, Dean and Gadreel were killed, while Castiel locked up Metatron. He has currently left Heaven as he doesn't want to be a leader and was dying due to his burning-out grace before Crowley saved him with Adina's grace. He has since reclaimed the last of his own grace and restored to full power and being a Seraph once again.
After the release of the Darkness and the trauma he suffered under Rowena MacLeod's spell, Castiel agreed to act as the vessel for Lucifer to walk the Earth once more so Lucifer could battle the Darkness. Castiel would remain Lucifer's vessel for months, only emerging briefly to save Sam's life and convince the angels to help against the Darkness. At the end of the conflict with the Darkness, Lucifer was exorcised from Castiel by the ancient being, leaving Castiel in control of himself once more.
Following Lucifer's exorcism from him, Castiel would dedicate himself to finding the fallen archangel and locking him away, blaming himself for Lucifer being free upon the Earth once more. This task caused Castiel to reluctantly work closely with Crowley who also desired Lucifer gone. Following Lucifer's apparent defeat, Castiel dedicated himself to hunting down Lucifer's son Jack, a dangerous Nephilim. After a battle with Dagon that resulted in Castiel's brief empowerment by the child, Castiel became convinced of the child's supposed goodness and chose to become his protector and guide, forsaking the Winchesters in the process. While trying to lock Lucifer in an alternate reality, Castiel was killed once more by the Fallen Archangel. Following his death, Castiel was then sent to The Empty, where all angels and demons go when they die, to sleep for eternity. He was awoken from his eternal slumber when Lucifer's son Jack called his name. He was soon expelled from The Empty by the Cosmic Entity, due to interfering with the latter's slumber and demanding his release, allowing him to be resurrected as a result. Castiel soon reunited with the Winchesters and Jack to help them out in their hunter cases. He later met with Lucifer who returned from the other world and warned him about the invading Michael. While in a debate over recruiting Jack, Castiel and Lucifer were captured by Asmodeus with Castiel being used as a bargaining chip for the Winchesters. Castiel escaped and was betrayed by Lucifer who nearly killed him but he retaliated before the latter fled and Castiel returned to Sam and Dean to warn them about the impending threat.
Castiel's legacy has seemed to have become legendary among angels and demons alike, as many recognize him as the only angel who defied God's rules and cooperated with humans on his own decision, which he is either loathed or respected for. He is also the only angel to have been killed and been resurrected multiple times. He is the only known angel who has repeatedly been resurrected by God so he could help Sam and Dean Winchester.
As an angel, experiencing Castiel's true form will result in blindness, deafness, or even death, as the appearance of his natural visage is so overwhelming that it is capable of burning human or demon eyes from their sockets (as seen in Lazarus Rising), as he said, "My true form. It can be overwhelming to humans and so can my real voice." However, Castiel stated certain, "special people" are able to tolerate his true appearance and voice. Although his true form has never been seen, it is known that he has two feathered wings. When Castiel was a seraph, he describes himself as a "multidimensional wavelength of celestial intent" and his true form is "approximately the size of your Chrysler Building" in height. As he was promoted to a Seraph, it stands to reason his true form has changed to one of a Seraph's. It is presumed to be tremendous and terrifying, as the mere image of it was enough to cause Crowley to flee in fear of being smited. In addition, Castiel has been referred to as being attractive on more than one occasion, both in his human vessel and his true angelic form. One female demon, while talking with Crowley, once instantly said Castiel was, as she said in her words, hot, as she also said, "I mean, human Castiel? eh. But, feathered Castiel? 'Phew." The same demon even once called him "Captain Sexy." Another instance was a woman who referred to him as "young and sexy" while he was god and had recently killed a pastor at the church she attended. Since having his grace removed for Metatron's spell, Castiel has lost his wings, even with Theo and Adina's grace. Though he has since regained the remnants of his grace and been restored to full power, his wings are broken.
For humans, they see him as the appearance of his vessel, Jimmy Novak, who is a handsome man of average height in his thirties. He sports a pair of dress shoes, a black suit, a buttoned white-striped dress shirt, and loosened blue necktie accentuated by a beige trench coat. Although he has a very dire demeanour, his outward appearance radiates a natural calm and serenity which makes conversation easy and direct. Since his third resurrection, his appearance has changed. He lost his trench coat upon his third death and when he became amnesic, he wore different clothes. Upon regaining his memories, Dean gave him back his trench coat, but he still wore Emmanuel's clothes until he became insane. While insane he wore his trench coat and hospital scrubs. While in Purgatory he retained the same outfit, albeit extremely dirty and torn off. Castiel also grew a beard and his hair became messier. After returning from the monster realm, Castiel returned to his original appearance. He kept this until he lost his grace and became human. While he initially kept his usual clothes, they became dirty and he was unable to clean them and get food and water so he abandoned the trench coat and suit and took to wearing more casual human clothes, though he did wear a suit when he pretended to be an FBI agent. After becoming an angel again, Castiel donned a new suit and trench coat, albeit not as accented as his previous trench, nor as long. He at first didn't wear a tie like before, but after a suggestion from Claire Novak that he looked better in a tie, Castiel donned the blue striped tie from his FBI suit.
In 1901, Castiel possessed a female vessel and dressed as a woman from that era. Notably, he wore a coat very similar to the trench coat he wore in his first appearance. It is safe to say that, like most angels, Castiel does prefer to retain his vessel's original appearance and clothing. He does not seem to have a high fashion sense, preferring neatness over beauty.
Castiel is a strong, determined, impulsive, competitive and naive celestial being. Like most angels, Castiel expresses little to no emotion, which creates flaws and complexities in his persona. Despite this, he does not display the blank apathy or mocking superiority that seems to characterize angels such as Uriel or Lucifer. His lack of emotion and understanding of human behaviour such as sarcasm has led to several humorous situations throughout the show and has occasionally gotten him into trouble with humans, ultimately leaving Dean or Sam to amend the situation. He does, however, become close friends with the brothers, who encourage him to be kinder, more caring and more selfless.
Unlike some of his brethren, Castiel still has faith in God, though not to the zealot-like extent displayed by Michael. While he admits he may not always understand what God wants and may question His reasoning, Castiel always follows his father to the best of his abilities. This, along with his interest in humans, has caused other angels to label him as weak or naive, but also peculiar. Anna and Lucifer have both displayed this attitude, with Anna calling him a hypocrite for refusing to rebel in order to gain more freedom. Castiel briefly loses this faith after Joshua reveals that God doesn't care and falls into a depression for some time. However, when God resurrects him for the second time, his faith returns. Castiel frequently exhibits what could be referred to as affection towards Dean, and seems to express regret, hesitance, and anger at several points.
Being around the Winchesters, paired with his experiences in the War, have taught Castiel several "tricks" that have helped him during the show. While not possessing free will in the same sense as a human, Castiel has learned how to bend the rules at times, like in season 4. The best example is when he informs Dean about Chuck's archangel, thereby giving Dean the idea to use him to save Sam from Lilith (The Monster at the End of This Book). He also is able to distract Meg long enough to use her. This was similar to a trick Uriel performed to free Alastair from a ring of holy fire (Abandon All Hope). It is also possible he learned from the demon Crowley to wipe out loyalists of his adversary, Raphael. Castiel also considers himself to be the Winchester's personal guardian angel.
When Castiel is brought back from the dead after Lucifer kills him, his personality begins to shift. During Season 6, Castiel becomes more prideful. It is because of this pride that Castiel makes a deal with Crowley and starts the civil war in heaven. During this time Castiel showed extremely high ambition, doing everything he could to open the door of Purgatory. He also displayed his intelligence, being capable of tricking Dean, Sam, Raphael, and even Crowley (well known as a crafty trickster.)
Upon absorbing the souls, Castiel's hubris grew to the extent that he claimed to be the new God. It was later revealed that others, such as Death, thought of him only as a mutated angel. Previously acting kind, assuring, and fierce at times, Castiel had now become almost purely cold and absolute in his decisions. This is displayed when he kills Raphael without any second thoughts. Mere seconds later, he demanded that Dean, Bobby, and Sam kneel before him and be by his side. Castiel claimed he would destroy them if they forgot their place and rose up against him. However, he still had some lingering affection for them, trusting them enough to leave them alone. They soon realized that he was out of control and that being influenced by the Leviathans. Later, when Castiel returns to his original personality, he feels incredibly guilty and goes back to his friend for help. Knowing Dean is furious with him for breaking Sam's wall, Castiel expresses true remorse for his actions and swears to do all he can to make up for what he did.
After his third resurrection, Castiel lost his memories and took on a more human personality, though he was still more distant than normal humans. He expressed affection for his wife Daphne Allen and retained his desire to help people as shown by the fact that when he rediscovered his healing powers, he used them to heal people in need, also showing great compassion. While shocked by the existence of demons, he took it relatively well once it was explained to him. He was perceptive enough to realize that Dean couldn't forgive "Cass" for what he had done and felt betrayed and that he himself was the Cass mentioned after overhearing some of Dean's conversation with Meg. In his human mindset, he had no idea of what he was capable of and was nervous with the idea of using his powers to kill demons when he had no idea how. However, despite this, he displayed courage in agreeing to try and seemed to still possess an instinctual knowledge of how to use them as he quickly figured out what to do.
After recovering his memories, Castiel's normal personality more or less returned, and he was overcome with guilt over what he had done, how many he had killed, and for releasing the Leviathans, even questioning why he was still alive. Following his awakening, his personality was greatly modified, due to a combination of what he had taken from Sam and his own guilt. It made him inattentive, overly calm, uncaring and seemingly dim. He also became a pacifist, and refused to fight, even when being attacked, as well as being overly optimistic, perceiving many negative things in a positive way. During this time he developed a unique relationship with Meg, a demon, as she was his caretaker during his insanity. He showed open attraction to her, calling her a "thorny beauty". Although Meg doesn't return the feelings at the start, a year later she openly flirts with Castiel, and Castiel seemingly returns the attraction. In Survival of the Fittest, Castiel explains that his pacifism comes from being afraid of causing more damage with his actions. However, he agrees to break his pacifism and help stop the Leviathans, possibly out of loyalty to Dean as he agrees after Dean says he'll likely die trying to stop them. After agreeing, he doesn't hesitate to fight, helping to dispatch Royce and getting in front of Dean to protect him from Dick Roman and later restraining the Leviathan leader so Dean can kill him. Castiel also displays a bleak view on his resurrections: instead of believing it to be a gift from God for his service, he now sees his resurrections as punishment for his actions, telling Dean "I see now it's a punishment resurrection, it gets worse every time."
After he and Dean were sent to Purgatory, his sanity and original personality were restored, although he himself states nobody could ever be sure if he is indeed sane. Following his return in A Little Slice of Kevin, Castiel displayed a slightly more laid-back personality and a much less detached persona and showed human emotions as well as a taste for human things, as he commented how he missed watching TV. He has also developed a strong desire for penitence, looking for any way possible to redeem himself for the devastation he caused Heaven and his fellow angels.
Since becoming human briefly, Castiel has become more human. He expresses more of an appreciation for human things and develops more human emotions such as romantic attraction. He also became less serious, drinking a beer with Sam and Dean and joking around. He proved to be good enough at being human that he was able to fool law enforcement and pose as an FBI agent, something he could never do successfully before even with coaching from Dean. Even after becoming an angel again, Castiel hasn't seemed to lose his human emotions, getting very angry when he realized who Gadreel was and freely expressing it and comforting a distraught Dean, understanding why he was so upset rather than being confused as he would have been in the past. While briefly human, he was ready to embrace his new status, excited to have Sam and Dean as his teachers and seemed to see his return to being an angel as a necessary evil more than something he wanted and his stealing of the grace of Theo as barbaric and something that made him as bad as the other angels. Castiel also seems to now understand human ways better, able to drive and steal a car, a skill he never previously showed, though he still lacks full knowledge of everything as he didn't know to get gas. He also developed a taste for human food, something that was made harder by the return of his angel powers and completely lost any former disgust he had towards Sam, finally understanding why he'd done everything he did. Castiel also learned that the ends don't justify the means when it means sacrificing lives. Thanks to Metatron, Castiel has also finally gained the ability to understand Dean's constant movie and TV show references, something that had previously frustrated him into always saying "I don't understand that reference." This helps him now understand the human culture better.
Castiel seems to have a fondness for his usual appearance as he never changed until he briefly believed he was human. At first, he may not have changed out of lack of necessity, but after returning from Purgatory, he put back on his usual outfit and was very pleased to be able to do so. He seemed to be particularly fond of his trenchcoat as even insane he wore it and was seen to only reluctantly let it go when as a human he was unable to afford to clean it. After becoming an angel again, he donned a new trenchcoat and suit, once again displaying his fondness for that particular attire.
In the aftermath of being put under the Attack Dog Spell by the witch Rowena, it, according to Metatron, made Castiel broken and paralyzed due to the trauma and due to him attacking other people, including Dean. Even after Castiel was free from the spell, it still has also apparently "scarred" Castiel so deep that Cass wouldn't even leave the bunker. Even Metatron, who is now human, noticed it especially when he said Castiel couldn't even hit him. However, while he misjudged it as Castiel being afraid, after being hit and thrown by Castiel multiple times, Metatron then realized that Cass is not scared, but is actually angry instead about, as Metatron said, "being everyone's tool. Manipulated and used by the angels, by your enemies, by your friends." Even Castiel himself said that he is tired of having his strings pulled.
Castiel eventually allowed Lucifer to possess him in order to be useful to the fight with Amara, seeming to see himself as useless now. Castiel only fought Lucifer once to protect Sam but was unable and unwilling to expel Lucifer from his body. When Crowley entered Castiel to get him to expel Lucifer, Castiel was shown to have become apathetic to the whole situation and intended to just wait for the fight out, not intervening even when Crowley and Lucifer fought it out in his mind and simply scolding them for bothering him. Crowley believed that Lucifer did something to Castiel to cause this, that Lucifer "got his hooks in good." When given control by Lucifer to speak to the angels, Castiel displayed his regular personality rather than the one Crowley saw in his mind and stated that he truly believed his role in the upcoming fight was to give Lucifer form on Earth so he could aid God in defeating the Darkness. After Lucifer is expelled from Castiel by Amara, Castiel seems to return to his old self completely with the archangel's influence gone from his mind but continues to believe he did the right thing by consenting to Lucifer's possession.
Now free from an impending war, Castiel seeks to capture Lucifer for he believes himself to be responsible for letting the archangel out, going so far as to decline help from Sam and Dean but accepting Crowley's simply because the demon proves useful, though Castiel repeatedly expresses dislike in having to work with Crowley, calling the situation "unfortunate". Unusual for his character, Castiel has begun using sarcasm and now throws around witty retorts, most notably at Dean. However, it should be noted that Castiel continues to feel out of place and in a desperate need to prove himself.
As noted by Uriel, Naomi, Metatron and Ishim, Castiel is very attached to his ward, Dean Winchester, though he has come to include Sam and Mary as people in his care, and despite accusations that these three humans make him weak, Castiel defends that they are the source of his strength. His determination to keep them alive has led him to murder Billie despite the consequences, proving that Castiel will put his own well being below theirs. He has also chosen to trust them more than his angelic siblings, given their history of deceiving Castiel and their very contrasting beliefs. Most remarkably, Castiel continues to be a forgiving, loving and gentle angel whenever he can. His current desire to undo his past sins and mistakes has compelled him to make a change.
- Raphael (First Time)
Exploded at the molecular level by Raphael for attempting to intervene in the Raising of Lucifer. Resurrected by God to help stop the Apocalypse.
- Lucifer (Second Time)
Exploded at the molecular level by Lucifer in revenge for striking Michael with holy fire during the Battle of Stull Cemetery. Resurrected by God as a Seraphim as a reward for his role in stopping the Apocalypse.
- Leviathans (Third Time)
Imploded from the effects of acting as the vessel to all of the Leviathans. Resurrected by God with no memory in what Castiel would come to believe was a punishment for his actions.
- April Kelly (Fourth Time)
Tortured Castiel for information on Metatron's spell then stabbed him in the chest with an angel blade when the Winchesters arrived to stop her. Resurrected by Gadreel.
- Lucifer (Fifth Time)
Stabbed Castiel through the back with an angel blade for interfering with his plans. Resurrected by the "friendly neighbourhood Cosmic Entity" from The Empty when he demanded to be sent back to Earth.
- Castiel and Dean – Castiel and Dean are best friends, brothers in arms. It was said by Castiel himself that they share a more profound bond, compared to his bond with Sam.
- Castiel and Sam – Castiel and Sam are good friends. Both express an understanding towards one another as experienced through the understanding of self-sacrifice they've shared towards each other and to Dean.
- Castiel and Bobby – Castiel and Bobby are friends. Castiel acts generally amiable towards the older hunter.
- Castiel and Meg – Although Castiel and Meg are opposite sides, they both have an unusual connection to one another and are shown uncommonly to have a possibility for romantic interest.
- Castiel and Crowley – Like with Meg, Castiel and Crowley are opposite sides but they have occasionally worked together, most of Castiel's irritation.
- Castiel's minor relationships – Castiel's other relationships he encounters.
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