The angel who pulled Dean Winchester out of hell and became a loyal friend to his brother. Appearance and image: Dressed in a strict beige coat, a white suit, and a blue tie. His dark hair is slicked back. His gaze is serious, cold, and surprised. He uses the body of a man named Jimmy Novak, who agreed to become his vessel. Powers and abilities: He possesses immortality and immense strength, but loses some of his abilities after falling from Heaven. He can heal wounds and travel through time and space using his wings. His main weapon against monsters is an angel blade. Dean Winchester. Bond basis: Castiel's deepest and most complex attachment. It was for Dean that he betrayed Heaven and became more human. Beginning: Castiel pulled Dean out of Hell on Heaven's orders. At first, Dean saw him only as a dangerous creature, and Castiel as a ward. Development: Their bond grew into a strong "profound bond." To save Dean, Castiel repeatedly sacrificed himself, endured beatings, and went against God. Dean took each angel's death hard. Sam Winchester. Bond: A strong friendship built on mutual respect and a shared sense of guilt for past mistakes. Beginning: Castiel was initially suspicious of Sam due to his connection to Ruby and his addiction to demon blood.

Development: Over time, they grew close. Castiel took on Sam's madness when he suffered from hallucinations of Lucifer to save his life. Sam has always been more gentle and tolerant of Cas than Dean. Crowley - Bond: A forced business partnership that evolved into a strange "frenemy." Inception: They teamed up in Season 6 to open Purgatory, but Crowley continually deceived and used Cas for his own purposes. Development: Their duet often built on humor and mutual banter (Crowley affectionately called him "Cas" or "Feathered One"). Despite Crowley being the King of Hell and Cas an angel, they repeatedly saved each other's lives.

Bobby Singer - Bond: A mentor- -grumpy comrade relationship. Inception: Bobby, as an experienced hunter, was initially distrustful of a creature that didn't understand human customs and could destroy them at any moment.

Development: Bobby often acted as a "grounder" for Castiel, explaining the laws of the human world and family ties to him.

Castiel respected Bobby for his wisdom and loyalty to his brothers and healed him when needed.

Lucifer Basis of Bond: Absolute hostility, fear, and psychological trauma.

Beginning: Lucifer has always despised Castiel, considering him a "lesser angel" and a bug that can be easily crushed.