- Kelly Blatz as Charlie Landers/Aaron Stone: The protagonist, who assumes the role of his video-game avatar in order to protect his family and the world. His Hero Rising avatar and real-live secret identity is named "Aaron Stone." He is 16 years old as far as we know.
- David Lambert as Jason Landers/Terminus Mag: Charlie's 14 (most of season 1) - 15-year-old (end of season 1) younger brother, who, like Charlie, is an enthusiastic Internet-game player. His gaming skills are seriously lacking. He appears in the game as Terminus Mag, a giant golden robot who is his brother's ally. Jason has no idea his brother Charlie is a secret real life world crime-fighting hero: Aaron Stone. He has a crush on Emma but she doesn't return his feelings.
- J. P. Manoux as S.T.A.N.: Charlie's android sidekick. His name is said to be an acronym of "Sentient Tactical Assisting Neo-human". Stan is ruled by Asimov's Laws of Robotics: He must not harm humans or allow humans to be harmed, and he must obey orders. Stan's lock-down mode activates whenever his circuits are being tampered turning him into traveling cargo.
- Tania Gunadi as Emma Lau/Dark Tamara: A computer-savvy tomboy who is Charlie's next door neighbor. She knows of Charlie's double identity and works for Mr.Hall. She is very proficient in hacking, as she accesses Vas and Ram's Webcam in Kolkata after hacking Charlie's laptop and stealth. She created most of Charlies weapons and is a 2nd degree weapon specialist. She like Charlie has an alter-ego her avatar, Dark Tamara. It is hinted during the series that both Emma and Charlie have feelings for each other, and that given time it could develop into romance.
