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! The Lightman Group
!!Dr. Cal Lightman
-->'''Played by:''' Creator/TimRoth
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/ltm_cal2_5670.jpg]]
Founder of the Lightman Group and an expert in deception recognition, having spent years studying microexpressions.

* AbusiveParents: Cal's father smacked him and his mother around.
* ActionDad: He's the father of a teenage girl and while not generally physical, is not someone to get on the wrong side of.
* AmicablyDivorced: With his ex-wife Zoe. While their relationship is still tense due to Cal being, well, Cal, they make an effort to get along well for Emily's sake and are generally at least civil.
* AttentionDeficitOohShiny: Repeatedly. Sometimes it's fully warranted, as when he drops everything he's doing to fixate on a Very Big Problem (as with spotting a serial killer or bank robber), but still... what must that girl think when he tries to hit on her and has just given her a line and she's just gotten out a few syllables of "Well, you haven't given me the chance (to tell you my name)" when he bolts off to talk to a man standing in line?
* BadBoss[=/=]BenevolentBoss: Yes, at the same time. He routinely puts his employees through hell. But he'll also do anything to protect/help them.
%%* BadassBookworm
* BelligerentSexualTension: With his ex-wife Zoe. Apparently, her {{Tsundere}}-ness turns him on.
** Also has it with Gillian in season 3. Fun drinking game? Count the times Cal invades Gillian's personal space just to see her get irritated.
* BerserkButton: Cal can keep his cool around all manner of human scum but he absolutely despises those who hurt or abuse kids. He also loses it when someone hurts a member of his time. And if you even ''think'' of hurting Emily, there's no limit to what he will do to destroy you.
* BlessedWithSuck: Cal's brilliance and skill at spotting lies has come at the cost of struggling to maintain healthy relationships due to his obsession with honesty and treating every interaction as a battle where he has to outsmart his opponent.
* BunnyEarsLawyer: The only reason Cal isn't locked up for some of the stunts he's pulled is because he ''is'' a brilliant scientist and usually right.
** In "Rebound" - Cal actually wears bunny slippers in a scene.
* ByTheBookCop: At least once he's found the truth. It really doesn't matter to him why someone did something, the law's the law. So he'll question witnesses, get the truth out of them, and when he leaves, there are the cops, waiting to take them away for something only tangentially related that he found out about.
%%* ByronicHero
* CharlesAtlasSuperpower: Lightman trained for years to get his skills, while Torres has a built-in talent for it.
* TheChessmaster: Always. Gillian tends to be the only one who figures it out, though.
* ChickMagnet
* ConsummateLiar: If he ever used his powers on himself, the universe might implode.
** Gillian sees through him every now and then, and Torres has been getting in on the act, too.
** Emily's beginning to pick up her dad's talent for spotting deception, mainly in him.
* CrazyPrepared: Cal has in his office a safe containing at least three pistols, one shotgun and several cases of ammunition.
-->'''Reynolds''': Damn, Lightman. You're not messing around, huh?
* DarkAndTroubledPast: Hoo boy. Mother [[spoiler: committed suicide and Cal blamed himself]], father was a drunk who knocked Cal and Louise around. Cal has had a mysterious stint fighting the IRA in Belfast, is former [=MI6=] and was an interrogation specialist in the Yugoslav Wars, and was a deception expert for the CIA during UsefulNotes/TheWarOnTerror. All of which has come back to haunt him.
* DeadpanSnarker: Cal can hardly go a conversation without slipping in some snarky remarks. Being played by Creator/TimRoth certainly helps.
* FreudianExcuse: Cal developed his obsession with his work after his mother took her own life when he was a teen and he blamed himself for not being able to see the warning signs.
* TheGadfly: Cal ''loves'' antagonizing and messing with people in the smallest of ways to provoke a reaction. Sometimes, it's for the good of a case and to draw a confession. Other times, it's simply for his own amusement.
* GoodIsNotNice: Cal can be a weapons grade jerk a lot of the time but he's always on the side of good and cares very deeply about those close to him.
* GreenEyedMonster: Lightman gets in a very bad mood whenever Gillian shows interest in someone.
%%* GuileHero: SO much.
%%* TheHero
* HypocriticalHeartwarming: Cal's allowed to treat his team like dirt, but the minute anyone ''else'' does it, he gets pissy.
-->''Right now, you're hoping [Torres] messed up so you can blame this on someone else. Amusing. Laugh-a-minute. BUT YOU LEAVE HER ALONE!'' (Cal, in "Double Blind")
** And then he turns around later and tells Torres that if anyone "takes a bite out of her", to make them regret it.
* IAmVeryBritish: Averted - Cal's accent is the same as Tim Roth's, East London/Cockney.
* InterdisciplinarySleuth: Lightman is trained as a psychologist.
* IntelligenceEqualsIsolation: Cal's skill at his work has made it very hard for him to maintain relationships or friendships due to his struggles to turn his skill off and not treat every interaction as a mind game.
* {{Jerkass}}: It's hard to understand how Cal's still employed with the way he tampers with investigations. Looking at the way he treats virtually everyone in his life (even the people he supposedly ''likes''), it's a wonder Cal hasn't been shot more often.
** JerkWithAHeartOfGold: . . . and then you watch him being a father to Emily or teasing Gillian, and we realize that he does have his good points.
* LadykillerInLove: Hits this with Gillian in "Killer App", where he admits to Emily that yes, he's ''in love'' with Gillian.
* LivingLieDetector: So much so that it ruined his marriage - he couldn't stop reading Zoe.
** Also so much that he has to hold back from reading his daughter Emily all the time and has to let things slide on occasion or risk ruining their relationship.
%%* ManipulativeBastard
* MinoredInAsskicking: A [=PhD=] who can kick your ass if you don't tell him the truth.
* MrFanservice: It doesn't come up much but Cal is in good shape for a man his age and has a surprisingly muscular build for a scientist.
%%* NerdsAreSexy
* NoIndoorVoice: Prone to this as part of his schtick to annoy clients into confessing.
* NoSenseOfPersonalSpace: Cal often gets uncomfortably close to suspects to spot their tells and unnerve them enough to get them to slip up.
* NoSocialSkill: By his own admission: the first line of his second book was, ‘[[spoiler:Let me be clear. I understand very little, least of all the people close to me]].’

%%* PapaWolf: Do not threaten Emily. '''Ever'''.
* PersonaNonGrata: Cal's not what you'd call welcome in Vegas.
%%* TheProfiler
* RebelRelaxation: Tim Roth is so prone to this, the rest of the cast has dubbed it [[https://www.youtube.com/watch?v=7JX9gU5AfYs "The Lightman Lean"]].
* RefugeInAudacity: Cal ''lives'' in the realm of audacity.
* ShowyInvincibleHero: Most of the time, though this is slowly being deconstructed. Most recently, it was pointed out in "Funhouse" that getting himself admitted to a mental institution might have done him more harm than good, and it's Loker who actually breaks the case.
* SherlockScan: Cal is an expert at figuring out details about people with just a quick glance and he is extremely good at spotting lies or dishonesty.
* SociallyAwkwardHero: Cal is the hero of the series and can't seem to go five minutes without rubbing someone the wrong way, wheter accidentally or on purpose.
* ThrillSeeker: Cal admits to getting a rush from life-and-death situations. He often puts himself in danger, and when sent into a warzone he becomes even more hyped-up and erratic than usual.
* TookALevelInJerkass: Cal, in season three. Looks like {{Flanderization}}, unless the plot pulls something.
* {{Troll}}: He seems to take great joy in deliberately antagonizing...well, everyone. It's not clear if he's doing it to provoke an emotional reaction, just because he can, or some combination of the two.
* TwerpSweating: Cal's treatment of Emily's boyfriends might be one of the funniest examples.
* WillTheyOrWontThey: With Gillian, who is the "good girl" in contrast to his usual bad-girl type. Definitely reached MostImportantPerson status, and made explicit in "The Whole Truth" when Cal says to [[RomanticFalseLead Clara]] in regards to what Gillian is to him, "she's my Leo" (i.e. the person whom I trust above all others, even with my death).
%%* WorkingWithTheEx: And sleeping with her, too.

!!Gillian Foster
-->'''Played by:''' Creator/KelliWilliams
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/ltm_gillian_932.jpg]]
Cal's partner and co-owner of the Lightman Group, a trained psychologist.

* BettyAndVeronica: The Betty to Zoe, Poppy, Helen, and Clara's Veronica, regardless of the state of her marriage.
%% Doesnt explain what the reaction is. * BerserkButton: Do not shut her out of business decisions, and do not fuck with her when she's happy.
* BewareTheNiceOnes: Though she couldn't stop a group of thugs from breaking into her house and tying her up, she ''takes a frying pan'' to the head of one of the thugs from out of nowhere. Foster is a ''ninja''.
** Another example is the scene in "Killer App" when she loses her shit at the guy who killed one of her patients. She screams at him and shoves him around - for Foster, that's saying a lot - but it's really the implied threat regarding her made by Cal at the end of the episode that hits this trope.
--->'''Cal''': I've recommended you be sent to a mental hospital.
--->'''Zach''': Why would you do that for me?
--->'''Cal''': You framed an innocent man, you hacked my computers, you hurt a very close friend of mine, and you murdered a wonderful young girl. Now, prison will only take your freedom. But that hospital, the pills they'll give you? They'll take your mind. And make no mistake, ''Doctor'' Foster will make sure of that personally.
%%* TheConscience: To Cal.
* CoolBigSis: Gillian serves as one to Torres and Emily, as well as Ava (in "Delinquent").
* DeadpanSnarker: It comes out of nowhere, usually when Zoe's around.
* DealWithTheDevil: [[spoiler:What kept Zoe and Emily Lightman safe from "Finch" and the story of the Pentagon cover-up of the botched Doyle assassination quiet.]]
* FieryRedhead: Gillian doesn't get angry easily - except if you fuck with her when she's happy, Cal.
%%* TheLancer
* LegFocus: Lampshaded in "The Canary's Song":
-->'''Gillian''': (to a man in a wheelchair) They really call you "Wheels"?
-->'''Wheels''': Bet they call you "Legs".
%%* MamaBear: To Emily [[spoiler: before she even met her.]]
* ManipulativeBitch: Not nearly as bad as Cal, but subtle and manipulates people's emotions easily, such as relating to the victim with a story about a false brother in "Smoked". Loker thinks she is the best at lying of them all.
* [[MrExposition Ms. Exposition]]: Usually the one explaining to Loker/Torres/the clients/the audience what Cal's yammering on about.
%%* MsFanservice
* NumberTwo: In charge when Cal's not around, and in the lab even when he is.
%%* TheProfiler
%%* ReasonableAuthorityFigure
* SelectiveObliviousness: Gillian really doesn't want to know the truth about her husband. Unfortunately, [[spoiler: she finds out he's cheating on her with his drug sponsor ''and'' he's relapsed. Their divorce goes through in "The Core of It"]].
* SheCleansUpNicely: Twice, first in "The Core of It", when she comes into work in a hot pink dress to celebrate [[spoiler: her divorce going through]], and then in "Fold Equity", when she "embraces the Vegas". ''Yowza''.
* SherlockScan
* SweetTooth: Numerous times in the show, but the pilot is probably the best example:
-->'''Cal''': What is that now?
-->'''Gillian''': Orange slushie.
-->'''Cal''': How old are you?
* TeamMom: Though not, unfortunately [[spoiler: an actual mother.]]
* WillNotTellALie: Gillian doesn't claim to never lie, but her sense of morality and ethics won't let her. It's deconstructed in two episodes:
** ''Sweet Sixteen'': [[spoiler:Gillian's DarkSecret is exposed; she lied to Cal for ''seven years'' to keep him from investigating a case. The bad guys had threatened his family, and Gillian made a DealWithTheDevil to keep them safe.]]
---->'''Cal''': So all that talk about you being a bad liar is just an act. That's a lie.
---->'''Gillian''': Depends on the lie.
** ''Dirty Loyal'': [[spoiler:Cal asks Gillian to lie to IAB for his sort-of-girlfriend, Detective Wallowski, even though she knows that Wallowski is corrupt and she's duty-bound to tell the truth. Gillian does lie, but we have yet to see if there will be consequences.]]
* WillTheyOrWontThey: With Cal, though they've reached MostImportantPerson status. Emily's rooting for Gillian to hook up with her dad, though.

!!Eli Loker
-->'''Played by:''' Creator/BrendanHines
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/ltm_eli_5247.jpg]]
A laid-back employee of the Group, Loker practices what he calls "radical honesty".

%%* AgentMulder
* BreakTheHaughty: In season three, Loker seems to have thrown in the towel in regards to the Lightman Group, having no respect for Cal because Cal constantly demeans him. The way Cal treats Loker is explicitly likened to the process used to ''create a sociopath''.
* BrutalHonesty: He's introduced in the pilot as ''never'' telling anything but the complete truth, even if that means offending his coworkers (which he does).
%%* BunnyEarsLawyer
* ButtMonkey: First he [[spoiler: gets demoted to unpaid intern the one and only time he ever lies to Lightman]], then, about a season later, [[spoiler: almost gets blown up]].
%%* TheChewToy
* CluelessChickMagnet: Loker to [[spoiler: Emily Lightman.]] He's interested in protecting her and being polite, while she thinks he's into her, or at least pretends to. Also, humorously, to a third grade teacher in one episode.
* CombatPragmatist: Most notably in "The Canary's Song", with his baseball bat.
%%* DeadpanSnarker
* GeniusDitz: Comes off like this at first, but has been getting less ditzy.
* HandsomeLech: Especially with Torres.
* MeaningfulName: "Eli" is an anagram of "lie"
* NerdsAreSexy: And apparently, "better than average" in bed.
* NonActionSnarker: Loker would rather sit back and mock the proceedings.
%%* OnlySaneMan
%%* TheSmartGuy
%%* TheSoCalledCoward
* WillNotTellALie: Claims to at the beginning. By mid-season one, he's already lied in the course of an investigation.
* WillTheyOrWontThey: With Torres. As of "Darkness and Light", they [[spoiler: kiss, and it's implied ''something'' else happens, but Loker is promoted to Torres's boss, so they can't see each other]]. She seems pretty freaked out by this development, so expect it to continue.

!!Ria Torres
-->'''Played by:''' Creator/MonicaRaymund
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/ltm_torres_7206.jpg]]
A "natural" deception expert, hired by Cal and Gillian in the pilot to be his new protege.

* AlcoholicParent: [[spoiler:Her father, who used to drink heavily and beat his daughters. According to Cal and Gillian, one of the two hallmarks of a natural is an abusive background: if a child raised by abusive parents ''doesn't'' know when they have to be avoided and/or placated, and some idea as to how to achieve the latter, they suffer even more. Pavlovian conditioning, or as Tropers would call it, PowerAtAPrice... of a SNAFU childhood. Of course, Cal exploits her abusive past to solve certain cases.]]
%%* AgentScully
%%* TheApprentice: To Cal.
* FreudianExcuse: Ria has daddy issues, which lead her into [[spoiler: getting drunk and trying to seduce Cal]] in "Delinquent".
** Becomes a SugarWiki/{{Funny Moment|s}} when his reaction is to shove her into a cold shower, hard, and she realized what she just tried to do. Then, again when he later describes the incident as her [[spoiler: trying to stick her tongue down his throat]].
%%* JumpedAtTheCall
* LivingLieDetector: Unlike Cal, she's a "natural", born into her abilities to read deception.
%%* MsFanservice: On occasion.
* MissingMom: Nothing has ever been said of what happened to Ria's mother, though her step-mother is said to have overdosed and died six years ago.
* OnlySaneWoman: Seems to have reached this level in season three.
* PromotionToParent: [[spoiler:For her sister, Ava, in "Delinquent".]]
* SpicyLatina: Averted - a lot of male villains tend to want to see her this way, but she's actually the most rational and down-to-earth of the team.
* TokenMinority: Averted. With two of the five major characters being minorities, it's hardly token.
* WillTheyOrWontThey: With Loker. As of "Darkness and Light", [[spoiler: ''something'' happens, along with a drunken kiss, but they can't continue the relationship now that Loker has been promoted to her boss]]. Expect it to continue.

! Others

!!Zoe Landau
-->'''Played by:''' Creator/JenniferBeals
Cal's ex-wife, an attorney for the U.S. Dept. of Justice.

* AmbiguouslyBrown: It's revealed that she's half black.
%%* AmicablyDivorced: Most of the time.
* BelligerentSexualTension: Cal and Zoe live off this trope - while Emily has bad memories of their constant fighting, Cal thinks it was fun.
* BettyAndVeronica: The main Veronica to Gillian's Betty.
%%* BrainyBrunette
%%* DeadpanSnarker
* DropInCharacter: Shows up every so often to deal with something involving Emily, consult on a case (or hire Cal and Co. to consult for her), and sleep with Cal after spending the episode trying to convince herself (and the audience) that they're through.
* GiveGeeksAChance: With Cal.
* HelloAttorney: Or, as the internet has dubbed her, "Legs, Cleavage & Associates".
* MsFanservice: Again, "Legs, Cleavage, & Associates".
* SassyBlackWoman: Zoe may be considered as such, given that Zoe is half-black.
* {{Tsundere}}: And it's totally a turn-on for Cal.
* WorkingWithTheEx: They work very well together. Now they just need to stop sleeping with each other.

!!Emily Lightman
-->'''Played by:''' Creator/HayleyMcFarland
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/ltm_emily_8297.jpg]]

Cal and Zoe's teenaged daughter.

* BrattyTeenageDaughter: Mostly averted. Emily seems to be notably calmer than both her parents, and only gets into trouble in a few episodes. She's downright sweet and mature for a sixteen-year-old on television.
* TheConscience: For Cal. Zoe and Gillian both admit that, when all their attempts at getting Cal to open up fail, Emily is the one he'll open up with.
* DaddysGirl: She's an only child and Cal's ''really'' [[TwerpSweating overprotective]].
%%* FieryRedhead
* HugeGuyTinyGirl: The Tiny Girl to [[spoiler: Loker]] and new boyfriend Liam's Huge Guy.
* IntrepidReporter: Takes a journalism class in "Darkness and Light" and shadows the Lightman Group on a case.
* LittleMissSnarker: Someone's got to cut Cal down to size.
* MoralityPet: For Cal, mostly, but also for Gillian.
* PluckyGirl: Emily's quite perceptive and she doesn't make a bad partner-in-crime, as we see in "Truth and Consequences".
* ShipperOnDeck: Is seriously invested in getting Cal and Gillian to cut out the WillTheyOrWontThey and resolve their {{UST}}.
* SheIsAllGrownUp: Has been working toward it for three seasons, but an argument can be made for her Zoe-inspired outfit in "Rebound", and Cal's reaction.
%%* TagalongKid

!!Ben Reynolds
-->'''Played by:''' Creator/MekhiPhifer
An FBI agent assigned to the Lightman Group - mainly due to Cal's tendency to put himself in life-threatening situations. He gets PutOnABus at the end of season two.

* BecomingTheMask: What happened to Reynolds when he was undercover.
%%* TheBigGuy: So, so much.
%%* DeadpanSnarker: On occasion.
%%* [[FriendOnTheForce Friend in the FBI]]
%%* GeniusBruiser
%%* OnlySaneMan: Especially when he's teamed with Cal.
* PutOnABus: In "Darkness and Light", he [[spoiler: follows Cal to an undercover meet, gets shot three times, presumably lives, and all we ever hear about him in season three is that Cal's "severed his ties to the FBI".]]
%%* TokenMinority