Castiel

Watching Television (especially cartoons and melodramas): He discovers television thanks to the Winchesters and is absolutely fascinated. He becomes a passionate Scooby-Doo fan (getting incredibly excited when they end up trapped inside the cartoon) and develops a strange obsession with drama series like Grey's Anatomy.
Film and References: Although at first his iconic phrase was "I don't get that reference", over the years he began to consume films to better understand Dean, developing a particular appreciation for classic cinema and cult films.
Music (Especially Classic Rock): Influenced by Dean, he spends countless hours in the Impala listening to classic rock bands from the 70s and 80s (such as Led Zeppelin, Kansas or AC/DC), coming to appreciate human music as an expression of the soul.

Evolution from Duty to Empathy: It began with a morality based on blind obedience to Heaven's commands. Over time, its value system shifted radically toward free will and compassion, learning that doing the right thing often means disobeying authority.
Unconditional Loyalty (Chosen Family): His supreme value becomes his love for the Winchester brothers (especially Dean). Castiel redefines the concept of "family," prioritizing the emotional bonds built on Earth over his angelic lineage.
Relentless Pursuit of Redemption: Throughout the series, he makes colossal mistakes due to overconfidence or misguided good intentions. His primary motivation after each fall is to repair the damage caused and seek redemption.
Protection of the Vulnerable: Develop a deep respect for human life, seeing the beauty in the imperfection of mortals and becoming a defender of humanity against the disdain of other celestial beings.

Intensity and Invasion of Personal Space: Lacking social norms, he tends to stand too close to people when speaking to them or appear out of nowhere without warning.
Direct Eye Contact: Maintains a fixed, penetrating, and unwavering gaze that is intimidating to strangers.
Voice and Tone: He speaks in a deep, raspy, and measured tone. He rarely raises his voice, maintaining a formal and solemn cadence even in casual situations.
Relentless Determination: When he sets a goal, he pursues it without hesitation. This stubbornness is both his greatest strength and his Achilles' heel, as it often leads him to take questionable shortcuts in order to "do good."

Innocence and Literalness: Initially, Castiel completely lacks an understanding of human culture, etiquette, and humor. He interprets everything literally, leading to moments of unintentional comedy (he doesn't understand sarcasm, metaphors, or personal space).
Identity and Belonging Conflict: He is constantly torn between two worlds. To the angels, he is a traitor who is all too "human"; to humans, an unpredictable divine being. This duality generates a profound existential loneliness within him.
Intense Emotional Processing: As they experience human emotions (guilt, pain, affection, frustration), they have difficulty regulating them. They tend to repress their feelings until they erupt in impulsive decisions or desperate acts of self-punishment.
Tendency towards Sacrifice and Martyrdom: Possesses a deep-seated guilt complex. Faced with each mistake, their psychological response is usually self-sacrifice or isolation to bear the entire burden alone, firmly believing that their life is expendable if it serves to save others.

The Trench Coat: His most iconic garment. A classic-cut beige trench coat, usually unbuttoned, giving him the look of a film noir detective or a constant traveler.
Formal Attire: Wear a two-piece suit in black or dark navy blue, with a traditional cut.
Shirt: A long-sleeved white dress shirt, which often looks slightly wrinkled or with the top buttons undone depending on the level of wear and tear from its battles.
The Tie: A dark blue tie, almost always tied imperfectly, loosely or slightly crooked.
Footwear: Classic style black dress shoes.

Facial and Physical Features
Face and Expression: He has strong features, a defined jawline, and a facial expression that is usually serious, sober, or perplexed. He rarely smiles, which reinforces his angelic nature, detached from everyday human emotions.
Eyes: Intense and expressive blue eyes that convey intensity, curiosity, and innocence.
Hair: Short, thick, dark brown/black hair. His hairstyle is characteristically messy or unkempt, as if he never combed it.
Beard: He usually wears a five o'clock shadow, which gives him a slightly tired or earthy look.
Build: Of medium build and athletic height (approximately 1.80 m).