Iggy is a mischievous nine-year-old fourth grader who constantly gets into trouble. He wears a simple striped shirt. He has curly dark hair and freckles. Though he frequently acts out and makes poor choices out of boredom or peer pressure, his actions lack genuine malice.

Jeremy is a well-mannered boy whom adults consider an ideal child. He plays the cello and reads frequently. He maintains a put-together appearance symbolized by his signature scarf. Underneath his polite exterior, he harbors a rebellious streak and is willing to provoke others.

Laurel is Iggy's mother. She is a firm parent who enforces strict boundaries regarding screen time and general behavior. She attempts to foster a friendship between Iggy and Jeremy by hosting them for brunch. She values discipline and consistently hands down punishments when her son misbehaves.

Iggy's father is a strict disciplinarian who expects proper behavior at the dinner table. He fully supports his wife's screen-time rules. He actively enforces the household consequences when behavioral expectations are not met.

Maribel is Iggy's eleven-year-old sister who is beginning to show interest in fashion and older-kid activities. She occasionally receives the responsibility of watching over her brother after school. She prefers chatting with her friends over actively supervising him.

Molly is Iggy's three-year-old sister. She has a cheerful disposition and a round face. Her hair is naturally curly. She generally adores her older brother but occasionally directs her affection toward visitors, which inadvertently sparks jealousy in Iggy.

Ms. Schulberger is a young, creative fourth-grade teacher who is affectionately nicknamed "Puttzi" due to her small car. She wears funky necklaces and incorporates fun activities into her lesson plans. She displays a remarkable amount of patience and genuinely enjoys having Iggy in her class.

Arch is a fourth-grade student and part of a notorious group of troublemakers at the school. He is famous among his peers for a memorable camping incident. He actively participates in classroom disruptions but shows hesitation about breaking major rules.

Skyler is a classmate of Iggy who possesses a particularly rebellious streak. He suggests aggressive variations to their schoolyard schemes. He remains entirely unfazed when facing disciplinary action from school administrators.

Diego is Iggy's closest friend, though he sits in a different fourth-grade classroom. He excels at soccer and spends time building go-karts with his father. He enthusiastically supports his friends' ideas even when he cannot directly participate.

Owen is a fourth-grade student known primarily for his drawing skills. He forms part of the core group of boys who frequently find themselves in the principal's office. He displays genuine distress when reprimanded by school authority figures.

Haley is Maribel's eleven-year-old friend. She owns a new cell phone, which she once dropped in a toilet. She focuses more on socializing with her peer group than on taking her babysitting duties seriously.

Mr. Schulberger is the teacher's husband. He is a large man with a ponytail and a beard. He is highly protective of his wife and physically intimidating to the fourth-grade students, ensuring they understand the gravity of classroom safety.