History Characters / PersonOfInterestDecimaTechnologies

* TheIdealist: Near the end of Season 4, he declares himself to be this.

* TheSpook: One of the best, possibly second only to Finch. Little is known about him but he is very good at getting information on his targets.
* TheSpymaster: The ultimate example in the show. He's expressed knowledge of everyone on Team Machine at some point or other besides Carter and Fusco.
* TookALevelInBadass: When he was introduced in Season 2, his attempt at getting control of The Machine went off the rails and turned into a costly fiasco for his company. Season 3 has him conducting a meticulously coordinated BatmanGambit in order to get The Machine replaced with a system of his own, and for every move Team Machine makes, he manages to perform counter-moves of his own and force the previously invulnerable protagonists who could out-shoot, outwit or out-buy their opponents to actually work for their survival. And then at the end of the Season, he wins, trapping Team Machine in a situation where Samaritan will dump the weight of American law enforcement and Decima on them if they reveal themselves.
* StiffUpperLip: Nonchalantly continued to look at a bit of paperwork while Reese and Shaw blasted through some of his mooks without even turning around to look, then leisurely finished looking at the paper and turned his attention to Reese and Shaw without so much as batting an eyelid or showing a flicker of discomfort at the situation that was apparently not in his favor. The fact that reinforcements were on the way probably contributed to this.

->'''Played by:''' Creator/RobertManningJr\\

->'''Played by:''' John Nolan, Emrhys Cooper ([[Recap/PersonOfInterestS04E10 1973]])\\

->'''Played by:''' Annie Parisse\\

->'''Played by:''' Julian Ovenden\\

->'''Played by:''' Robert Manning Jr.\\

->'''Played by:''' Cara Buono\\

->'''Played by:''' Quinn Shephard\\

->'''Played by:''' Oakes Fegley\\

->'''Played by:''' Michael Potts\\

->'''Played by:''' La Chanze\\

* FBIAgent: His job.

* TheDarkChick: Partly because of her willingness to conduct brazen attacks against her targets and also because she has a Artificial Intelligence system talking to her in her ear.

* AffablyEvil: Polite, charming, and utterly ruthless. zigzagged for mid season 4 /most of season 5 where this nothing more than a sadistic facade but in the final episodes he settles back into his likable affable self. it seems Finch was right when he called him a madman.

* FauxAffablyEvil: By "Search and Destroy", he finally begins to shed his usual affable exterior. And if there was any doubt that at the end of the day that he's still the BigBad for all his WellIntentionedExtremist objectives, the scene during "Asylum" where he's almost gleeful about how Root is set to get her head cut open shows how far he's fallen. defied at the end of the series where he reverts back to his charming self ardently praising samaritans efforts and good intention and almost begging finch to join him.

* HumansAreBastards: He views humanity under quite a dim light. [[FreudianExcuse Of course]], he grew up during the Blitz and later worked as a spy in the height of the Cold War, so he has seen his fair share of human monstrosity and [[GreyAndGrayMorality moral ambiguity]].

* TheUnfettered: A horrifying textbook case and the thing which defines him from Harold. Beneath the AffablyEvil EvilBrit act beats the heart of a man who is willing to go to untold lengths taking over the world by any means necessary.

->'''Played by:''' David Aaron Baker\\