Griffin is a 12-year-old seventh grader known throughout his town as The Man With The Plan. He possesses unyielding confidence and persists in his goals despite frequent obstacles. His elaborate schemes often land his loyal group of friends in trouble with the adults of Cedarville, but his dedication to clearing his name drives his actions.

Ben is Griffin's long-time best friend. He is a small, fearful boy who constantly talks himself into participating in dangerous operations out of loyalty. He experiences episodes of narcolepsy and requires a service ferret to wake him from sudden sleeping spells.

Savannah acts as the emotional center of Griffin's friend group. She maintains a house filled with exotic pets and possesses a unique ability to communicate with them. She regularly offers practical feedback when group operations seem unnecessarily risky.

Melissa is an extremely shy seventh-grade student. She hides her face behind a curtain of long hair and rarely speaks. She operates as the technical wizard of the group, utilizing her exceptional computer skills to hack systems and link digital devices.

Pitch is a tall, athletic tomboy. She handles the group's climbing and physical tasks. She brings a pragmatic, cynical perspective to their chaotic operations and harbors frustration over being excluded from school sports.

Logan is a theatrical student who treats daily life as an acting performance. He firmly believes he will achieve fame as an actor. He readily assumes false personas to gather information during neighborhood investigations.

Dr. Egan is the newly appointed principal of Cedarville Middle School. He immediately targets Griffin based on the boy's troublesome reputation. He acts as a strict disciplinarian and football coach, quickly jumping to harsh conclusions when school property disappears.

Darren is a popular athlete who harbors petty jealousy toward Griffin. He operates as a thuggish presence in the school. He focuses entirely on his own advancement and actively seeks to cause physical or emotional pain to Griffin's friend group.

Shank is a heavily built eighth grader attending the Jail For Kids alternative education center. He immediately inserts himself into Griffin's life. His blunt, physical demeanor masks a strong desire for genuine friendship.

Tony is an eighth-grade student and relative of Art Blankenship. He firmly believes the valuable sports memorabilia currently housed at the middle school rightfully belongs to his family. He openly resents the school's celebration of the artifact.

Celia is a local columnist for the Cedarville Herald. She maintains a long-standing grudge against Griffin. She uses her newspaper platform to fabricate a youth crime wave narrative that targets local students.

Mr. Clancy is a school custodian who retains access to locked areas of the building. He is a lifelong fan of the Baltimore Colts. He actively resents the school's celebration of a New York Jets championship piece.

Detective Vizzini is a police sergeant who holds residual frustration over past cases. He eagerly pursues Griffin as the primary suspect when a crime occurs at the middle school. He places severe legal restrictions on the boy's movements.

Judge Koretsky is a local judge who holds significant authority over Griffin's fate. She issues arbitrary restrictions based on past prejudices. She orders Griffin's transfer to a strict alternative school program without waiting for concrete evidence.

Griffin's Mother is a long-suffering parent who frequently places guilt trips on her son. She struggles to balance her maternal protection with intense frustration over his antics. She must constantly answer directly to legal authorities for his behavior.

Griffin's Father is a working suburban parent who commutes from Cedarville. He views his son's constant need for legal defense as a massive headache. He invents devices like the Vole-B-Gone and remains deeply critical of property damage.

Lindsay is the eleven-year-old daughter of the middle school principal. She enjoys planting spring flowers in her yard. She unwittingly creates a rift between two boys who both find her attractive.

Luthor is a massive, impetuous Doberman. His sudden outbursts occasionally cause trouble for the neighborhood. He displays a remarkable capacity to follow specific commands from his owner.

Ferret Face is a prescribed service animal. His primary duty is keeping a narcoleptic student awake. He occasionally fails this task by becoming distracted by bugs at crucial moments.

Cleo is a highly intelligent pet monkey. She reliably executes specific tasks like stuffing envelopes. She carries physical communications across the neighborhood on command.

Arthur is a mischievous wild rodent. He scurries loose through the Drysdale home as an unwanted intruder. His sudden presence creates tension among the resident pets and causes extra stress for his temporary host.