Omar is an energetic, highly imaginative young Muslim boy who refers to himself as a trouble magnet. Moving to a new neighborhood and school causes him significant anxiety, prompting him to rely on his creativity to cope with the changes. He is deeply connected to his family and his Islamic faith, which informs his worldview and responses to adversity.

Mom is a meticulous scientist who wears a hijab and deeply values her family's routines. She approaches conflicts with grace, attempting to extend kindness to those who are unwelcoming to her family. Her strong Muslim faith and compassionate nature guide her parenting and her interactions with her neighbors.

Dad is a relaxed, motorcycle-riding scientist with a highly supportive approach to parenting. He organizes "Science Sundays" with his children and helps Omar handle the challenges of a new environment. He encourages his family to remain patient and positive in the face of local prejudice.

Maryam is Omar's thirteen-year-old older sister who has memorized twenty-eight chapters of the Qur'an. She struggles with the family's relocation, frequently exhibiting teenage mood swings and frustration. Despite their occasional squabbles, she remains an integral part of the close-knit household.

Daniel is a student in Omar's new class who quickly establishes himself as a bully. He targets Omar and his friend Charlie with verbal insults and physical intimidation, frequently expressing anti-Muslim prejudice. His aggressive behavior masks deep-seated insecurities related to his home life.

Mrs. Rogers is the elderly, white-haired neighbor living next door to Omar's new home. She relies on negative stereotypes and is openly hostile toward her new Muslim neighbors. She frequently complains about the family's cooking and the children's noise, maintaining a suspicious distance.

Charlie is Omar's best friend at his new school. He is a polite, red-headed boy with thick glasses. His welcoming nature makes him an instant friend to Omar, and they offer each other loyal companionship as they both deal with being targeted by the class bully.

Esa is Omar's three-year-old younger brother. He is loud and energetic, frequently making a sticky mess of his surroundings. Though his antics disrupt family activities and prayers, he is deeply loved by his parents and siblings.

H2O is Omar's imaginary dragon companion, named after the chemical symbol for water. He serves as a protective mental barrier, giving Omar confidence when facing daunting situations like starting a new school and dealing with aggressive classmates.

Mrs. Hutchinson is Omar's supportive new teacher, known for her expressive curly red hair. She recognizes Omar's intelligence during science lessons and shows cultural sensitivity toward his religious observances.

Reza is Omar's twelve-year-old cousin who lives in Manchester. Omar looks up to him as "super-cool" and enjoys playing video games with him, though Reza's cynical worldview occasionally fuels Omar's anxieties.

Aunty Iman is Omar's Qur'an teacher. She is exceptionally patient with Omar's inquisitive nature, taking the time to answer his endless questions about his faith and religious practices.

Mohamed is a kind, older man who wears a traditional thobe and attends the London Central Mosque. He offers hospitality, guidance, and a safe haven to those who find themselves in need.

Eddy is an unhoused man who frequents the streets of London. He possesses a kind and helpful nature despite his scruffy appearance and difficult life circumstances.

Suzy is Daniel's chronically ill younger sister. Her frequent surgeries and need for medical care demand the vast majority of her parents' time and attention, deeply impacting her brother's home life.