Blake is a sixteen-year-old high school student who recently earned a full scholarship to Columbia University. Deeply traumatized by a childhood school bus crash where he was the only survivor, he lives his life with extreme caution and rigid organization. His aversion to risk constantly puts him at odds with his thrill-seeking younger brother. When his brother falls into a mysterious coma, Blake forces himself to enter a supernatural carnival to save him.

Quinn is Blake's thirteen-year-old younger brother and serves as his complete opposite. Rebellious and adorned with facial piercings, he operates as an adrenaline junkie whose life is defined by a desire for intense stimulation. He deeply feels the childhood abandonment of his father, reacting to family instability with a destructive and self-centered attitude.

Cassandra is a beautiful but unsettling supernatural being who serves as the soul of an otherworldly, midnight carnival. She functions as a psychological manipulator, preying on the specific traumas of the teens who enter her domain. She possesses eyes that look both icy and fiery, reflecting her dual nature as a tempter and an adversary. Her carnival rides physically manifest the inner anxieties of her victims.

Maggie is one of Blake's closest friends and Russ's current girlfriend. Though she is described as slim and attractive, she struggles with severe low self-esteem and persistent body image issues. She is the only person in the friend group who consistently shows genuine empathy toward Blake, creating a supportive emotional dynamic between them.

Russ is a muscular, disenfranchised jock who quickly loses interest in the sports he attempts. He relies on outward displays of physical strength and often treats Maggie roughly, hiding a fundamental lack of inner fortitude. Though considered Blake's best friend, their relationship is strained by opposing temperaments and unspoken resentments.

Blake and Quinn's mother struggles to maintain romantic stability following her ex-husband's abrupt departure. She cycles through a series of boyfriends who inevitably disappear from their lives. This continuous pattern creates a chaotic home environment that profoundly impacts her sons' emotional development and forces them to rely primarily on each other.

Blake and Quinn's absent father abandoned the family years prior on the night of their annual viewing of The Wizard of Oz. His sudden departure left a lasting psychological wound on his children. His absence deeply influenced Quinn's need for extreme stimulation and forced Blake into a role of rigid over-responsibility.

Carl is the newest romantic partner and current fiancé of Blake and Quinn's mother. He attempts to build a relationship with his prospective stepsons by offering them thoughtful gifts tailored to their interests. Despite his positive intentions, his presence introduces yet another wave of unpredictability into a household already fractured by abandonment.