Kate is Zach's best friend and the daughter of the family housekeeper. Beautiful and smart, she supports Zach in his adventures and is a strong influence in his life.

Mr. Herbert is a gray-haired mentor figure who guides Zach in understanding his powers and the challenges of being a hero. Initially distrusted by Zach, he proves to be a crucial ally.

Tom was Zach's father, a superhero who worked as a special consultant to the US president until his death. His legacy and untimely death inspire Zach to take up the mantle of heroism.

John is the Harriman family attorney who looked after them after Tom's death. Despite his connections, Zach sees him as a dubious figure due to his unclear motives.

Elizabeth, Zach's mother, is a dedicated campaigner for her late husband’s friend Bob Kerrigan's presidential run. Unaware of her husband's and son's superpowers, she is a constant source of support to Zach.

Senator Bob Kerrigan is a presidential candidate and a longtime friend of Tom Harriman, whose campaign becomes a focal point for Zach after his father's death.

The Bads are a nefarious group responsible for global chaos and the death of Zach’s father, posing as the primary antagonistic force Zach must face.

Spencer is the student body president and Zach’s school nemesis, antagonizing Zach due to his close relationship with Kate.

Knit Cap is directed by Mr. Herbert to test Zach in Central Park, serving as an initial adversary in Zach's journey.

Alba is the former nanny and current housekeeper for the Harriman family, known for her nurturing yet firm upbringing of her daughter Kate, who is close to Zach.