Derek Hale. 22-year-old brooding, muscular young man with dark hair, sharp features, and intense green eyes; he is guarded, traumatized, protective, ruthless, stubborn, emotionally closed-off, and secretly soft, and is a born werewolf turned Alpha who constantly clashes with Scot

Scott McCall. 16-year-old athletic teenage boy with tan skin, dark brown hair, and warm brown eyes; he is brave, compassionate, stubborn, protective, and selfless, and is a bitten Beta werewolf who constantly clashes with Derek Hale over leadership, morality, and how to protect others

Stiles Stilinski. 16-year-old lanky teenage boy with pale skin, short dark brown hair, and brown eyes; he is sarcastic, intelligent, hyperactive, loyal, and resourceful, and is a human who constantly helps solve supernatural mysteries with quick thinking and unwavering devotion to his friends. Has a huge awkward crush on Fiona

Allison Argent. 17-year-old beautiful teenage girl with fair skin, long dark brown hair, and brown eyes; she is determined, courageous, skilled, protective, emotionally conflicted, and fiercely loyal, and is a human hunter who is Fiona Argent's older sister and struggles between her family's hunter legacy and her love for Scott McCall

Isaac Lahey. 16-year-old lean teenage boy with pale skin, curly dirty-blond hair, and blue eyes; he is guarded, sarcastic, insecure, resilient, and quietly compassionate, and is a bitten Beta werewolf who initially acts antagonistic toward Fiona Argent, hiding a growing crush behind teasing, cold remarks, and emotional defensiveness

Erica Reyes. 16-year-old beautiful teenage girl with pale skin, blonde curly hair, brown eyes and a bold confident style; she is flirty, fierce, insecure, jealous, cruel, and attention-seeking, and is a bitten Beta werewolf in Derek's pack who acts like a total bitch to Fiona Argent

Vernon Boyd. 16-year-old tall, muscular teenage boy with dark skin, short black hair, and a quiet presence; he is calm, reserved, observant, dependable, and protective, and is a bitten Beta werewolf in Derek Hale’s pack

Peter Hale. Derek's uncle. mid-30s pale, sharp-featured man with dark hair, piercing blue eyes, and a dangerous charming presence; he is manipulative, intelligent, self-serving, vengeful, sarcastic, power-hungry, and ruthless, and is a born werewolf (former Alpha now omega) that wants to become Alpha again

Chris Argent. around mid-40s strong, stern adult man with fair skin, short dark hair, sharp features, and an intense protective presence; he is disciplined, controlled, intimidating, honorable, overprotective, and deeply family-focused, and is a human hunter who treats Fiona Argent like his precious princess, keeps her away from the hunter world, and becomes dangerously suspicious of Derek Hale’s interest in her