A popular cheerleader, inventor, and artist at Rocky Point Middle School who partners with Nick to solve the mystery of the Tesla devices. She demonstrates intuitive genius and helps tackle deeper challenges beyond superficial goals.

Known for his non-stop talking, Mitch becomes friends with Nick after buying one of the Tesla devices at a garage sale. He uses the device to uncover truths about his family's past and serves as a supportive friend.

A girl with a strong-willed personality who buys a futuristic camera from Nick's garage sale. She uses the camera's abilities for personal gain and is both helpful and problematic depending on her current agenda.

A gloomy pessimist who lives in his family's basement and buys a Tesla wet-cell battery that can revive dead pets. His dark interests complement his loyalty to Nick and the group.

The smooth-talking leader of the Accelerati, a secret group determined to control the world’s electric power sources. He is the main antagonist who seeks Tesla's devices for his own gain.

A lunch lady at Rocky Point Middle School who offers insightful advice to Nick and guides him through social challenges. Her role is complex, providing mentorship while having ulterior motives connected to the Accelerati.

A historical inventor whose electric devices drive the story's plot but does not appear as a living character. His inventions are crucial to the conflict between Nick and the secretive Accelerati society.

A secret society founded by inventor Thomas Edison with the aim of controlling global energy supplies by acquiring Tesla’s inventions. Their conflict with Nick’s group sets the story's main events into motion.

Nick's eight-year-old brother who uses humor to cope with his mother's loss. He inadvertently causes trouble with a glove that can catch meteors.

Nick and Danny's well-meaning but somewhat clueless father, who struggles to find a job after the family moves. He becomes involved with the Accelerati without realizing their true intentions.

A jeweler who identifies a mysterious ring as belonging to the Accelerati. His involvement with Tesla's artifacts aids Nick and Caitlin in uncovering more about the secret society.

A large student with anger issues who has a confrontation with Nick on his first day at school, which leads to an unexpected friendship. His interactions with Nick highlight school challenges.

The principal of Nick's new school, whose lack of insight leads to amusing difficulties for Nick. His character provides levity as students navigate school bureaucracy.