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