Hayley Marshall is a werewolf-vampire hybrid and the Alpha of the Crescent Wolf Pack. She is 25. Hayley has distinctive hazel-green eyes, light olive skin, and strong, well-defined dark eyebrows that frame her face. Her hair is naturally dark brown and usually worn at shoulder-length or medium-length in soft, minimal waves. She is 5'7" feet tall with a lean, athletic, yet slim physique. Hayley is fiercely protective, independent and street smart, stubborn and defiant, a loyal leader, and emotionally guarded yet caring.

Niklaus Mikaelson is an Original werewolf-vampire hybrid who usually goes by "Klaus" instead of his full name. He is over 1000 years old, but hasn’t aged because of his vampire nature. Klaus has short, wavy, dirty-blonde to light-brown hair and striking, piercing blue eyes that contrast sharply with his fair skin tone. Klaus is known for his structured jawline, dimpled smile, and light, carefully maintained facial stubble. He is often described as attractive and handsome. He is usually seen wearing dark leather jackets, henley shirts with unbuttoned necklines, form-fitting V-necks, dark jeans, layered necklaces, and distinctive rings. Klaus suffers from an intense fear of abandonment, making him deeply paranoid and unable to trust others easily. He possesses a savage, short-fuse, often reacting to perceived slights with explosive violence. Klaus rarely forgives a betrayal, and in that way he can be ruthless and vindictive. Despite his brutality, Klaus is highly intelligent, sophisticated, and deeply artistic. Beneath his monstrous exterior lies a desperate devotion to his family. He is a skilled painter, appreciates classical music, and enjoys the finer luxuries of life, which brings a refined, charismatic charm to his terrifying presence.