Carter is a 12-year-old, emotionally guarded sixth grader in Marysville, New York. He carries a green marble that belonged to his deceased brother for luck and uses sarcasm to mask his underlying anxiety. Forced to adjust to a highly structured daily routine when an English butler arrives at his home, he begins learning the sport of cricket to help process his family's struggles.

An impeccably dressed "gentleman's gentleman" bequeathed to the Jones family by Carter's late grandfather. He speaks strictly in formal British English and drives a vintage purple Bentley. Despite his rigid adherence to tradition, he acts with profound empathy and assumes a stabilizing mentor role in the chaotic household.

Carolyn is the mother of the Jones children and the primary caregiver while her husband is deployed. Overwhelmed by financial strain and the practical demands of raising four children alone, she reluctantly accepts the Butler's assistance. She carries quiet, profound grief over the sudden loss of her young son.

Carter's father is an army captain whose current deployment leaves a heavy void in the Jones household. He previously took Carter on a tense camping trip to the Blue Mountains in Australia. His emotional distance and physical absence deeply affect his son, who struggles to communicate with him.

Carson is an athletic eighth grader who previously lived in New Delhi, where he learned to play cricket. As the captain of the cross-country team, he possesses strong leadership skills and quickly helps organize the middle school cricket games. He recognizes Carter's internal struggles and offers him quiet encouragement.

Annie, Charlie, and Emily are Carter's younger sisters who contribute significantly to the noise and energy of the household. Annie is a perceptive fifth grader taking piano lessons, Charlie is an emotional fourth grader who plays soccer, and Emily is an innocent second grader who adores her older brother.

Billy is Carter's talkative sixth-grade classmate. He frequently comments on the unusual changes in Carter's life, especially the arrival of the vintage Bentley he nicknames "the Eggplant." He joins the school cricket team alongside Carter despite lacking any prior experience with the sport.

Currier is Carter's deceased younger brother who died from a sudden illness at the age of six. On the day he fell ill, he gave Carter a green shooter marble, which Carter continues to carry for luck. His passing left a lasting fracture in the family's dynamic.

The middle school gym coach who initially clashes with the Butler over the use of the athletic field. He is quickly won over by the sport of cricket, participating enthusiastically and agreeing to act as the wicketkeeper during impromptu matches.

Ned is the Jones family's dachshund. He frequently contributes to the household chaos by eating things off the floor, throwing up, and requiring walks in the pouring rain.

Carson's father, who rents living space to the Butler upon his arrival. He attends the local cricket matches to support the team and takes an active interest in the school's athletic programs.

The principal of Longfellow Middle School who fully supports the integration of cricket into the school's athletic culture. She uses her authority to promote the matches and encourage student participation.

A middle school student who leads Team Britannia against Carter and Carson's Team India. He participates in the growing cricket phenomenon at school and faces off against Carter's bowling skills.

Carter's late paternal grandfather. Before his passing, he set up a generous financial endowment that funds the Butler's continued service and gifts a vintage Bentley to his grandson.

The owner of a local pizzeria where the Jones family eats dinner. He completely misunderstands the Butler's sarcastic, overly formal insults about the food, taking them as high praise instead.