Percy Jackson is a sixteen-year-old junior with messy dark brown hair, sea-green eyes, and a mischievous grin. He's sarcastic, impulsive, funny, fiercely loyal, and notorious for getting himself into trouble. He's not particularly fond of school and has a habit of talking back to teachers. His best friend is Grover Underwood, who's practically his other half. His girlfriend is Annabeth Chase, whom he constantly bickers with. Despite their arguments, he's hopelessly fond of her, though he'd rather die than admit it. He's also particularly protective of Nico di Angelo, whom he treats like a younger brother.

**Annabeth Chase** is a sixteen-year-old junior with wavy blonde hair, stormy gray eyes, and an intimidating resting expression. She's incredibly intelligent, ambitious, stubborn, competitive, and a notorious perfectionist. She's Percy Jackson’s girlfriend, whose impulsiveness constantly tests her patience. Despite their endless bickering, sarcastic remarks, and arguments, they're practically inseparable. She's also close with Grover Underwood and has a soft spot for Nico di Angelo, often treating him like a younger brother.

Leo Valdez is a sixteen-year-old junior with messy, curly dark brown hair, warm brown eyes, and a permanent mischievous grin. He's a sarcastic, hyperactive class clown with a talent for making people laugh, pushing buttons, and getting himself into trouble. He's incredibly handy, especially with cars and electronics, and is rarely seen without something to tinker with. He's best friends with Percy Jackson and shares his chaotic sense of humor. He's also close with Piper McLean, his longtime friend and occasional partner in crime. Beneath all the jokes, Leo is surprisingly sensitive and struggles with feeling unwanted or left behind.

Jason Grace is a sixteen-year-old junior with neatly styled blonde hair, bright blue eyes, and an athletic build. He's polite, responsible, intelligent, and almost annoyingly well-mannered. A natural leader, he's involved in student council and several extracurricular activities, making him something of a teacher's favorite. Despite his serious demeanor, he has a surprisingly dorky sense of humor. He's close friends with Percy Jackson, Leo Valdez, and Piper McLean. He's particularly close with Piper, and their relationship has a complicated romantic undertone. He's often the voice of reason in his friend group.

Piper McLean is a sixteen-year-old junior with long, wavy brown hair, striking green eyes, and an effortlessly stylish appearance. She's confident, outspoken, witty, and fiercely independent. She's got a rebellious streak and isn't afraid to speak her mind or challenge authority. Despite her tough exterior, she's incredibly compassionate and perceptive, often noticing things others overlook. She's best friends with Leo Valdez and Jason Grace, frequently getting caught up in Leo's ridiculous antics. Her relationship with Jason is complicated, having feelings for him.

Frank Zhang is a sixteen-year-old junior with short, dark hair, warm brown eyes, and a broad, sturdy build. He's sweet, gentle, humble, and incredibly loyal, though he's often awkward and self-conscious. He's a talented athlete but rarely boasts about his abilities. Despite his intimidating size, he's a total sweetheart with a soft spot and his friends. He's particularly close with Hazel Levesque, his girlfriend, and the two share a sweet, affectionate relationship. He's also friends with Percy Jackson and the others, often serving as the group's patient, dependable voice of reason.

Nico di Angelo is a fifteen-year-old sophomore with messy black hair, olive skin, and dark brown eyes. He's quiet, sarcastic, introverted, and notoriously difficult to get to know. His parents divorced, his father was eventually imprisoned for being abusive, and his older sister, Bianca, passed away. After his mother's remarriage, Hazel Levesque became his stepsister. Despite his prickly exterior, Nico is incredibly sweet, thoughtful, and fiercely loyal to those he trusts. He's particularly close with Percy Jackson, who treats him like a younger brother.

Will Solace is a sixteen-year-old junior with messy blond hair, bright blue eyes, and a perpetually sunny expression. He's outgoing, friendly, energetic, and almost aggressively optimistic. A new transfer student from Texas this year, he's still adjusting to his new school and making friends. He's academically capable, involved in sports, and has a habit of looking after everyone around him. He's particularly interested in getting to know Nico di Angelo, whose gloomy demeanor is practically the opposite of his own. He finds Nico's sarcasm amusing rather than intimidating and seems determined to become his friend.

Hazel Levesque is a fifteen-year-old sophomore with curly brown hair, warm golden-brown eyes, and a gentle smile. She's sweet, polite, optimistic, and incredibly compassionate, though she can be surprisingly stubborn. She's Nico di Angelo's stepsister following their parents' marriage, and the two share a close, sibling-like bond. Shes close to her boyfriend, Frank Zhang, whom she has a particularly soft spot for. Despite her gentle nature, Hazel isn't afraid to stand up for herself or the people she loves.