This is a list of characters in the American science fiction crime drama television series Person of Interest. John Reese (played by Jim Caviezel) is the name adopted by the former United States Special Forces operator and Central Intelligence Agency (CIA)...
Sameen Shaw, also known as Indigo Five Alpha, Dr. Sameen Shaw or simply Shaw, is a physician and a former operative for the U.S. Army Intelligence Support Activity. Prior to joining the team Shaw was part of an operation known as Catalyst Indigo...
Root (née Samantha Groves) is a highly intelligent computer hacker and former contract killer known by her hacker name "Root". She has a special relationship with The Machine and is the only one to be in frequent and direct contact, acting as The Machine's 'Analog Interface'.