Trevor Joseph Brennan (AKA Trevor Bauer) - Ex NSA Information Systems Security Officer. He is the only child of Conor and Maeve Brennan, Information Technology moguls who built their IT empire on the coats of Biometrics technology.
Cassandra Cristina James (AKA Cassandra Bauer) - Ex CIA Security Professional where she further developed skills in personal security, physical and technical security and information assurance. She is the daughter of a former navy seal and owner of James Security Agency.
Conor Brennan - Trevor's father
Maeve Brennan - Trevor's mother
George Miller - NSA employee - Worked with Trevor in the Information Systems Security department. Another genius in computer systems and Trevor's partner on the Countermeasure Operation.
Robert James - Cassandra's father.
Stephan Connellan - Trevor's father's best friend and his right hand at Brennan Enterprises. Took over the direction of the company after the disappearing of Trevor's parents on behalf of Trevor. He is like an uncle to Trevor.
Nate Nelson - Cassandra's old buddy from the CIA. Has unrequitted love for Cassie. Cassie once saved his ass in the line of duty.
Kelly - Receptionist at James Security Agency
Jessica (Jessie) Forrester - Cassandra's Best Friend / Right Hand at work
Matt - Boy Wonder and computer genius at James security
Jeff Dillon - Employee at James Security - Cassie's nemesis
Allison Davis - ExClinic Employees who copies the formula
Joe Carter - IT guy at ExClinic
Drew Caldwell - Bristol's Chief Security Officer
Carl Kenyon - Middle man, recruited to retrieve the files.
Niklas Möeller - The mercenary cleaner
Edward Bristol - Bristol's CEO