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[[folder:Detective Robert Goren]]
->'''Portrayed by:''' Creator/VincentDOnofrio

Robert Goren is a quirky, extraordinarily intelligent investigator and criminal profiler, known for his instinct and insight.
* AmbiguousDisorder: He seems to have trouble connecting with others, has a hard time accepting changes in routine (most notably displayed any time Eames is absent), gets obsessive about things easily, latches on to small details... a lot of signs for something on the autism spectrum.
* BerserkButton: Don't disrespect his mother, or your own for that matter. And for the love of God, don't touch Alex Eames.
* BigScrewedUpFamily: Of the family members we see, Goren is the most normal and well-adjusted. That should tell you a lot.
* {{Cloudcuckoolander}}: He can come across this way, as illustrated by a lot of the details listed under AmbiguousDisorder.
* CreepyGood: His disturbing mannerisms really offset his legitimately noble intentions.
* DeadpanSnarker: His very dry sense of humour often provides some levity in serious situations.
* DefectiveDetective: During the series, Goren's history, coupled with his unorthodox style, became a source of trouble within the NYPD, spawning rumors and accusations that he was mentally unstable.
* DisappearedDad: His father walked out on the family when he was unable to take his wife's mental illness any longer. [[spoiler: His biological father, Mark Ford Brady, was briefly in his life when he was a child and was known to him as "Uncle Mark," but disappeared as well once things went sour with his mother.]]
* FreudianExcuse: Practically every member of his family has a disorder of some kind.
* GeniusBruiser: His primary ''modus operandi'' is to break suspects with mental gymnastics but he's shown several times that he is a formidable fighter as well. Only [[Series/LawAndOrderSVU Elliot Stabler]] is more likely than Goren to rough up a suspect.
%%* GuileHero
* HugeGuyTinyGirl: The 6'4" Goren is best friends with the 5'2" Eames.
* InTheBlood: [[spoiler: Goren's biological father turned out to have been a serial killer.]]
* {{Manchild}}: Until SanitySlippage started to set in, at any rate.
%%* ManipulativeBastard
%%* ObfuscatingStupidity
* PapaWolf: Hurting Alex in any way will make Goren go into such a rage he will break someone's neck or worse.
%%* {{Permastubble}}
* PlatonicLifePartners: With Eames.
%%* TheProfiler
* SanitySlippage: Starting around the end of Season Six, he starts getting every known misery in the universe piled on him. [[spoiler: His mother dies. His nephew goes insane and then goes missing. His brother screws him over repeatedly, and just when they've reconciled, he turns up murdered. His mentor reveals himself to have been the one who murdered his brother, as well as his arch-enemy, as a way to "help" Goren be free. His captain is murdered. He gets fired from Major Case.]] Finally, in Season Ten, he starts seeing a therapist and there seems to be some hope that he can get a break from the world constantly being unkind to him.
%%* TheSouthpaw
%%* TheSpock
%%* TallDarkAndSnarky
* TheUnfavorite: Despite being a highly decorated detective, Goren was always in the shadow of his dysfunctional older brother whom his mother always treated better. [[spoiler: Because Goren is the product of a man his mother had an affair with, and said man turned out to be a serial killer.]]

[[folder:Detective Alexandra Eames]]
->'''Portrayed by:''' Kathryn Erbe

Alexandra Eames is the quiet, practical partner who generally seems to mesh well with Goren despite the noticeable personality differences between the two.
* BadassAdorable: Alexandra Eames is five-foot-two, adorable, and blonde. And she is just as terrifying as Goren when she gets going, if not ''more'' so.
* BestFriendManual: To Robert Goren.
* BrokenBird: Her husband was a cop who was killed in the line of duty.
* TheCameo: Has made two guest appearances on ''Series/LawAndOrderSpecialVictimsUnit'', with more possibly to come.
* {{Catchphrase}}: "No, see....." How she starts a sentence when she's about to demolish a suspect's lie with evidence. She not only says it at least once an episode, but says it more times than any other character in the [=L&O=] ''universe''.
* CloudCuckoolandersMinder: Probably the only person in the entire NYPD who can keep Goren from going off the rails.
%%* DeadpanSnarker: In so, so many spades.
%%* FairCop
* HeterosexualLifePartners: With Goren.
* HugeGuyTinyGirl: With Goren.
* ItRunsInTheFamily: Comes from a family of cops.
* LivingEmotionalCrutch: If Eames isn't with Goren, he doesn't function properly. Perhaps best illustrated in the episode which ends with her giving birth; while ruminating on the motive of the killer, Goren looks at her empty desk and immediately understands what's in the guy's mind. "He misses his partner."
* MissingMom: In ten seasons, Eames mentions her mother exactly once, to say that she's a stroke victim. In an episode where she and Goren visit Eames senior, her mother is neither seen nor mentioned.
* {{Transplant}}: She has started making occasional guest appearances on ''Series/LawAndOrderSpecialVictimsUnit''.
%%* UnfazedEveryman
* WaifFu: Eames is five feet and two inches of pure {{badass}}. And ''she's'' the senior detective in her partnership with Goren.
* TheWatson: To Goren. Much like the good doctor, she provides an interface between her partner and the rest of the world.
* WrittenInAbsence: In Season 3, due to Kathryn Erbe's pregnancy; Eames was said to be acting as a surrogate for her sister.

[[folder:Nicole Wallace]]
->'''Portrayed by:''' Olivia d'Abo

Robert Goren's {{Archenemy}} and WorthyOpponent.
* AffablyEvil: A villain yes, but she's a polite one.
%%* AntiVillain
* BigBad: The closest thing the show has to this.
* TheChessmaster: A criminal mastermind, she is one of the few people ''[[GuileHero Goren]]'' encounters throughout the series who can get the better of him, particularly by confronting him about his unhappy childhood.
* DeadpanSnarker: As part of her being Goren's EvilCounterpart.
* DepravedBisexual: Downplayed. She's bisexual and a villain but, her villainy is not correlated to her sexuality.
%%* DiminishingVillainThreat
* EvenEvilHasLovedOnes:
** Gwen Chapel, the cancer-ridden daughter of her ex-fiancé, is about the only person for whom she shows any genuine affection.
** She also claims that Goren is the only man she's ever loved, although the sincerity of this claim is questionable.
* EvilBrit: Technically she's Australian.
* FreudianExcuse: Goren theorizes that she was molested by her father as a child and that the trauma bred in her a pathological drive to use and destroy anyone who gets close to her; this is frequently implied to be true.
* HotTeacher: In her first appearance.
* OffingTheOffspring: Killed her three year old daughter before the series began.

[[folder:Detective Mike Logan]]
->'''Portrayed by:''' Chris Noth

Logan is a troubled detective who formerly worked in the detective squad of Manhattan's 27th precinct.

For tropes relating to Logan's character in the original series, please see [[Characters/LawAndOrder the Law & Order character sheet]].
* CharacterDevelopment: Subtle, but Mike has better control over his temper than he did back in ''Law and Order''. It makes for interesting contrast when he's temporarily paired with Nola Falacci, whose own temper control is...shall we say, not as refined.
* DeadpanSnarker: A trait he retains from the original series.
* HotBlooded: Still shows signs of this from time to time, but it's ''way'' toned down from the original series. His temporary partner in Season 7, Nola Falacci, comments on this, saying that she'd heard he was a hothead; Logan responds to this by handing her a newspaper article about the incident in the original ''Series/LawAndOrder'' in which he punched a homophobic councilman.
* {{Transplant}}: From ''Series/LawAndOrder'' to ''Criminal Intent''.

[[folder:Detective Megan Wheeler]]
->'''Portrayed by:''' Julianne Nicholson

Megan A. Wheeler is Mike Logan's second partner in the Major Case Squad.
* BrokenBird: Her fiance's lies about his criminal activities are revealed when he gets arrested by the FBI right in front of her. And then, once he's locked up in federal prison for twelve years, she finds out she's pregnant with his child.
* DeadpanSnarker: Not quite to Eames' level, but she gets plenty of moments.
* OlderThanTheyLook: Is noted by a number of characters to look very young. Logan, upon meeting her, makes a snarky comment about her getting carded at bars.
* PutOnABus: After her character gives birth at the end of Season Eight.
* WrittenInAbsence: In the seventh season, she goes on a special assignment in Europe for six months due to Julianne Nicholson's pregnancy. An episode of ''Series/LawAndOrderSpecialVictimsUnit'' establishes that she later retired.

[[folder:Detective Nola Falacci]]
->'''Portrayed by:''' Alicia Witt

Megan Wheeler's temporary replacement while she was on a special assignment in Europe.
* FieryRedhead: Noted in-universe to be more hot-headed than Logan, a detective whose temper got him demoted.
* TemporarySubstitute: Becomes this for Logan while Wheeler was away.

[[folder:Captain James Deakins]]
->'''Portrayed by:''' Creator/JameySheridan

The captain of the Major Case Squad in Seasons One through Five.
* KnowWhenToFoldEm: His career ended when a former friend of his framed him for corruption charges; he resigned rather than tarnish his reputation further or bring danger to the detectives trying to help him.
* RealLifeWritesThePlot: His actor had Bell's Palsy during the filming of Season Four, so the illness was written in for Deakins.