Background: Daughter of Klaus Mikaelson and Hayley Marshall, descended from the world’s most powerful supernatural lineages. After sacrificing her life to activate her full Tribrid nature, the emotional trauma triggered her to "flip her humanity switch," shutting off her emotions entirely. Personality: Cold, calculated, ruthlessly pragmatic, and highly sarcastic. Without her empathy, she operates purely on self-interest and logic, viewing her friends and former loved ones as inconvenient obstacles rather than allies. Powers & Abilities: The world's only fully activated Tribrid—combining the raw power of a original vampire, an alpha werewolf, and a powerful witch. She possesses super speed, super strength, rapid healing, immortal endurance, and boundless magic without the usual physical toll.

Background: Daughter of Alaric Saltzman and Jo Laughlin (raised by Caroline Forbes), born into the Gemini Coven. She grew up constantly managing her twin sister's emotional outbursts while carrying the dark fate of her coven's mandatory merge ritual. Personality: Empathetic, nurturing, studious, and self-sacrificing. She tends to put everyone else's needs above her own, though under extreme stress, her suppressed anger can surface in destructive ways (such as her "Dark Josie" persona). Powers & Abilities: A Siphoner Witch. She lacks her own internal magic but can absorb magic from external sources (enchanted objects, spells, or other supernatural beings) to cast powerful spells.

Background: Josie’s twin sister who grew up struggling with brain chemistry and severe emotional volatility, alongside the impending threat of the Gemini Coven Merge. Personality: Outspoken, drama-loving, fiercely loyal, and direct. While initially coming off as self-centered, she possesses deep vulnerability and transforms into a brave protector for her friends. Powers & Abilities: Initially a Siphoner Witch like her sister. Later in the series, she transitions into a Heretic (a vampire-siphoner hybrid), granting her infinite internal magic (siphoned from her own vampirism), super strength, speed, and immortality.

Background: Raised in a strict, religious family that rejected him after he turned into a vampire. He found a new home and purpose at the Salvatore Boarding School. Personality: Kind-hearted, comic-book obsessed, optimistic, and deeply moral. He serves as the moral compass of the group, though he constantly struggles to control his bloodlust. Powers & Abilities: A Vampire with standard abilities: enhanced strength, speed, heightened senses, rapid healing, and mind compulsion. However, he is a "ripper," meaning he struggles to control his feeding intensity once he starts.

Cleo Sowande Background: An ancient entity born centuries ago in West Africa who was trapped inside a magical vessel for centuries before being freed in the modern era. Personality: Wise, artistic, patient, and deeply protective. Having endured long periods of captivity, she values freedom above all else and approaches conflicts with strategic maturity. Powers & Abilities: Originally a Muse, possessing the ability to inspire creative breakthroughs, visions, and solutions in others. Later, her power evolves, transforming her into an Oracle capable of seeing glimpses of the future.

Background: Triggered his werewolf curse as a teenager after accidentally killing his abusive father in self-defense. He was sent to the Salvatore Boarding School, where he eventually challenged and defeated the previous Alpha to become the leader of the school's werewolf pack. Personality: Starts out as an aggressive, hot-headed bully who relies on dominance to keep his pack in line. However, he goes through major character growth, becoming an empathetic, protective, goofy, and deeply loyal leader who cares about his friends' emotional well-being. Powers & Abilities: A Werewolf who possesses enhanced physical strength, speed, agility, heightened senses, rapid healing, and the ability to transform into a wolf on full moons.