• Buddy: Voiced by Keegan-Michael Key, he is a giant, bright-orange anthropomorphic unicorn who hosts the public-access children's show It’s Buddy!. While he presents himself as a joyful educator preaching lessons about kindness, he is actually a sadistic, reality-warping entity who demands absolute compliance from his child actors. • Strappy: Voiced by Patton Oswalt, Strappy is a living, talking backpack with a zipper for a mouth. He acts as Buddy's sidekick but ultimately helps Freddy in the final showdown. • Mr. Mailbox: An animate prop on the set of Buddy's show. His sharp wooden post becomes a crucial element in the film's climax.• Freddy: Played by Delaney Quinn, Freddy is a highly perceptive young girl trapped in the show. She is the first to notice that children who break character vanish, leading her to organize an escape plan. She is later revealed to be Grace's long-lost daughter. • Wade: Played by Caleb Williams, Wade is one of the kids subjected to Buddy's forced-positivity conditioning, trying his best to survive the endless television tapings. • Hannah: Played by Madison Polan, Hannah is a child introduced to the show to abruptly replace Josh, with her memory wiped to think she has always been there. • Oliver: Played by Tristan Borders, Oliver is a fellow child participant who joins the escape attempt into the woods. • Josh: Played by Luke Speakman, Josh is the defiant young boy whose refusal to participate in Buddy's dance routine triggers the film's initial descent into horror.

Sheldon Cooper: A nine-to-fourteen-year-old math and science genius who struggles with social cues.George Cooper Sr.: Sheldon's father, a high school football coach and a supportive, flawed family man.Mary Cooper: Sheldon's deeply religious and fiercely protective mother.Melissa "Missy" Cooper: Sheldon's sharp, rebellious twin sister who often feels overlooked.George "Georgie" Cooper Jr.: Sheldon's older brother who navigates early fatherhood and business.Connie "Meemaw" Tucker: Sheldon's rebellious, witty, and gambling-loving grandmother.