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!!Don Eppes (Rob Morrow) [[quoteright:203:http://static.tvtropes.org/pmwiki/pub/images/don_eppes2_708.jpg]]

* BigBrotherInstinct: Don has always been protective of Charlie, even when they weren't that close as kids. As such, when antagonists in particular target his brother, he goes on the offensive.
* BrainsAndBrawn: He's the badass FBI agent to his math professor brother, what'd you expect?
* ChickMagnet: Seriously, the guy has had at least five girlfriends.
* FairCop: FBI and quite a looker.
* KnightTemplarBigBrother: When one guy went after Charlie, Don walked right into his office and told him right to his face that he would take him down hard for going after his brother.
* PapaWolf: Threatening his family, team or associates is a good way to make Don pissed at you. Exploited in an episode. The Russian mob intentionally went after his brother and team as an elaborate distraction from their scam.
* SiblingTeam: The premise of the show is he's this with Charlie.
%%* SiblingYinYang
* TheStoic: Don has a tendency to be a stone wall with his emotions. His girlfriend actually lampshades him doing this.
* TeamDad: To be expected as the head of his unit. He looks out for them.
* TheUnfavourite: Not intentionally, but due to being a math child prodigy, Charlie required a lot more of their parents' attention when they grew up. Alan has some guilt about it and Don initially has some resentment, but they get over it.

!!Charlie Eppes (David Krumholtz) [[quoteright:233:http://static.tvtropes.org/pmwiki/pub/images/xxx_6665.jpg]]

* AbsentMindedProfessor: Not to the extent of Larry, but he has his moments. Downplayed otherwise since he connects well with his students.
* {{Adorkable}}: Whenever he gets into his math teachings he can be this. He never lost his passion for math.
* AnnoyingYoungerSibling: He is younger than Don by 5 years. While he didn't pester him, Charlie's advanced mind often made things awkward for the both of them growing up.
* BadassBookworm: Post-CharacterDevelopment. He has become better able to deal with hostile situations and learns how to shoot quite well in fact.
%%* BrainsAndBrawn: The brains to Don's brawn.
* BrainyBrunette: Dark brown curly hair? Check. Mathematical genius, ''check.''
* DefectiveDetective: Charlie, a mathematical genius who uses his talents to help his FBI agent brother solve crimes, has emotional difficulties to the point that he locks himself in the garage to work on unsolvable problems when he can't deal with life. However, he overcomes this early on.
* GentlemanAndAScholar: He's quite approachable and a gentleman, no doubt to being raised well by his parents.
* GoodWithNumbers: ''UpToEleven''. He went to ''univerisity'' at 13 and mathematics remains to be his strongest passion.
%%* HollywoodNerd
* InsufferableGenius: He can be this at times, especially when confronted by a rival.
%%* InterdisciplinarySleuth
* JewishAndNerdy: Downplayed. While quite nerdy, he doesn't think much on his Jewish background. Becomes more noticable when Don takes a greater interest in Judaism in later seasons.
** NiceJewishBoy: He is still Jewish and quite a nice young man.
* NonActionGuy: While he does later learn to shoot firearms, he is still primarily best when at the brains.
* TheProfessor: Professor Charles Eppes thank you very much.
* QuirkyCurls: Amita certainly likes them.
%%* ShorterMeansSmarter
* TheScully: Reacts this way to psychics in constrast to the more open minded Larry.
* TheSmartGuy: To pretty much the whole team in general.
* SmartPeoplePlayChess: To the point that the only chance that most people have at beating him is for two people to play him at once while also distracting him.
* TheStoryteller: Charlie teaches math with stories.
* TheStrategist: Charlie would probably qualify with his ability to mathematically predict the moves of evildoers.

!!Larry Fleinhardt (Creator/PeterMacNicol) [[quoteright:209:http://static.tvtropes.org/pmwiki/pub/images/larry_fleinhardt_7489.jpg]]
* AbsentMindedProfessor: Oh yes. He's a very quirky person and has a tendency to be philosophical, which makes him amusing to the eyes of his students.
* BerserkButton: Somewhat downplayed; The episode "Atomic No.33" has the team deal with a cult; their regards to faith-healing and disregard to medicine and science makes him angry, albeit in a subdued manner. Still, this is probably one of the angriest we've seen him.
* BunnyEarsLawyer: A very bright and valuable man; he even went into space once. However, he also sold his home out of not wanting to constrain himself and once had a diet of only white foods, among other quirks, such as staying in bathtubs for a long time (which is related to the home thing).
* CloudCuckoolander: He comes off as this at times, due to his selling his home, that time he ate only white foods, long periods in bathtubs and his eccentric philsophical nature in general. Charlie and the others help keep him down to earth.
* TheGamblingAddict: A former one, and his experience comes in handy when a prior colleague of his does the same scheme they did when they were younger -- card-counting.
* GentlemanAndAScholar: While he be may an eccentric, he is still quite the gentleman and a very knowledgable physicist.
* TheLancer: To Charlie when it comes to the folks of CalSci.
* LikeASonToMe: It becomes increasingly evident that Larry views Charlie as this and when Larry went off on a sabbatical, he entrusted his work to Charlie in a way a father would to his son. Charlie in return very much looks up to Larry.
* OppositesAttract: Philosophical and dorky Larry is mutually attracted and has a relationship with practical and analytical profiler, Megan Reeves. Very much lampshaded how odd the couple are.
* ParentalIssues: Not to the extent of Megan, but he had problems with his father wanting him to become an artist.
* [[PutOnABus Put On A Space Shuttle]]/[[TheBusCameBack The Space Shuttle Came Back]]: Left in "Brutus" for doing research on the ISS. Landed safely in the "The Art of Reckoning".
* TheProfessor: A physics professor at CalSci and he was Charlie's professor back when ''he'' was a student.
* SesquipedalianLoquaciousness: Part of what makes him come off as an eccentric professor, remiscent of the stereotypical kind.
* SmartPeoplePlayChess: He often plays chess with Alan He becomes ''much'' better at it when he returns from his sabbatical.
* TheSpock: Downplayed. While Larry can show joy and sadness, he is often in a state of logical calmness and relies on logic and rationale. He's also not that good with dealing with passion and emotional uncertainity, which was examined in his budding relationship with Megan.

!!Alan Eppes (Judd Hirsch)

* GoodParents: He does an admirable job in raising his son to be honest and good men and he still looks out for them with advice and assistance. No wonder Charlie and Don trned up as well as they did.
* IWantGrandkids: Alan takes the proactive approach, giving solid relationship advice to Don and Charlie.
* TeamDad: Not just to his sons, but to their co-workers as well, serving as an impromptu father figure. He also serves something of an older brother figure to Charlie's mentor Larry.
-->'''Alan:''' I'm going to give you the same advice I give to all the geniuses I know.
-->'''Larry:''' And that is?
-->'''Alan:''' Don't be an idiot.
-->'''Larry:''' Ah. (nodding)

!!Amita Ramanujan (Navi Rawat)[[quoteright:216:http://static.tvtropes.org/pmwiki/pub/images/amita_ramanujan_5536.jpg]]

* ArrangedMarriage: Amita was in one and knew the guy as a good friend since she was young. [[spoiler: Her parents invited him back to try and win Amita over and she does greet him warmly. When Charlie voices his concerns though, she explains that is ''gay'', something Charlie and her parents weren't aware of. Not only does Amita realize how awkward it made Charlie feel, but what her parents attempted to do.]]
%%* BollywoodNerd
%%* BrainyBrunette
%%* TheChick
* GamerChick: As revealed in the episode "Primacy". Even when she was supposed to lose, her gaming reflexes kicked in and she won anyway.
%%* HotScientist
%%* HotTeacher
* [[GentlemanAndAScholar Lady and a Scholar]]
%%* LadyOfWar: In "Primacy" and other episodes.
* ParentalAbandonment: Not quite, but Amita's parents are always too busy to visit her.

!!David Sinclair (Alimi Ballard) [[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/numb3rs_david_9308.png]]

* BaldBlackLeaderGuy: Although not technically a leader, he is Don's second-in-command.
%%* BlackBestFriend
* DarkAndTroubledPast: He grew in a rough neighborhood with troubled family members. He once described having to dodge gangs to graudate high school.
* HeterosexualLifePartners: With Colby. The two are often seen side by side one another when investigating and David took it the hardest with [[spoiler: Colby supposedly being a double agent, later revealed to be a triple agent.]]
* TheLancer: He's Don's right-hand man and the one people listen to when Don's not around. Fittingly, he takes Don's position when Don ends up moving on into a different role.

!!Colby Granger (Dylan Bruno)

%%* TheBigGuy
* ColdSniper: Of course, all the FBI agents have to be this to a degree, but somehow Colby ends up having to shoot criminals more often than the others.
* DeadpanSnarker" Colby does has his moments.
* [[spoiler: FakeDefector: Colby turns out to have been a triple agent for several years. This causes a fair bit of drama and angst, since the rest of the cast find out about the "defector" part well before they find out about the "fake". ]]
* HeterosexualLifePartners: With David.
* HiddenDepths: Is fluent in Spanish, which comes in handy when the team investigates the case of missing Spanish girls.

!!Megan Reeves (Diane Farr)[[quoteright:228:http://static.tvtropes.org/pmwiki/pub/images/megan002_7436.jpg]]

* ActionGirl: The most frequent female team member we see in the action and she isn't afraid to kick ass when need to.
* DeadpanSnarker: Likes to snark a lot, especially with Colby.
* FormerTeenRebel: As revealed when she was kidnapped, she used to be a fair bit wild when she was younger. It's implied this played a role in her choice to leave the FBI to counsel women in prison.
%%* LadyOfWar
* NerdsAreSexy: Dates Larry, to everyone's surprise.
* OppositesAttract: Philosophical and dorky Larry is mutually attracted and has a relationship with practical and analytical profiler, Megan. Very much lampshaded how odd the couple are.
* ParentalIssues: Has a serious problem with her dad that resurfaces every now and again.
** [[FridgeBrilliance Probably why she was drawn in by someone like Larry,]] outside of him having some problems (albeit not to the same extent) with his own father.
* PutOnABus: She ends up leaving the FBI to become a counselor to women in prison at the end of Season 4.
* TheProfiler: She is the one who psychoanalyzes their suspects and trying to figure out their motives.
* WhyCouldntYouBeDifferent: According to her, she was her father's "last attempt to get a son."

!!Liz Warner (Aya Sumika)

%%* ActionGirl
%%* LadyOfWar

!!Nikki Betancourt (Sophina Brown)

* ActionGirl: Takes Megan's role of this starting in Season 5.
* DeadpanSnarker: Often manages to outsnark Colby.

!!Terry Lake (Sabrina Lloyd)

%%* TheProfiler

!!Ian Edgerton (Lou Diamond Phillips)

* AntiHero: Out of the FBI, Ian's the one most willing to use extreme means to complete his task, most apparent during "Ultimatum", and shows no hesitation in killing. He's still an overall a good guy, though.
* ColdSniper: You bet it! It sort of comes with being the fifth?.. [[YouDoNotWantToKnow Fourth?..]] [[BrickJoke Third]] best sniper in the country. He lives up to the reputation, too. If he's in an episode, he'll usually outshine the agents by being the one to take out the criminal of the week.

!!Robin Brooks (Michelle Nolden)

%%* HelloAttorney
* HeroesWantRedheads: Don's on-again-off-again girlfriend. [[spoiler: And fiancee, by the end of the series.]]
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