%%Zero-context examples have been commented out. Add context to the entries before uncommenting them.

You know the drill. This is a listing of characters for ''Literature/The39Clues''. Beware of unmarked spoilers!



[[folder:Main Characters]]

!!Daniel Arthur "Dan" Cahill

* ActionSurvivor: He and his sister begin the first series as this, though by the SequelSeries, they have both TakenALevelInBadass, bigtime.
* AnnoyingYoungerSibling: Starts out as this. In the end, he still gets on Amy's nerves fairly frequently, but they have been through a great deal together and have realized that their strengths and weaknesses balance each other out.
* BackToBackBadasses: With Amy in ''Day of Doom''.
* BadassDriver: While escaping the Janus hideout.
* BewareTheNiceOnes: Dan's pretty good-hearted, at least compared to his clue-hunting rivals, but once he's decided it's worth hurting someone, he's not going to hesitate to do so.
* BewareTheSillyOnes: Sure, Dan's a jokester, and that's exactly why you should watch out. He's great at tricking people.
* BreakTheCutie: The events of the first series are what do this, but the effects aren't completely visible until the second series. [[TheWoobie But once they are, Dan begins to have some very dark thoughts, considering that the books are aimed at ''children'']]
* BrotherSisterTeam: With Amy.
* CharacterDevelopment: As Amy thinks to herself in ''Into the Gauntlet.''
* ChasteHero: {{Justified}}, as he's only 11-13 in the series. (Also, he's probably seen from his sister's love life that romance only complicates things, and his life is complicated enough as it is--what with escaping homicidal enemies, trying to save the world, being an awesome ninja, and all that.)
* CheerfulChild: At first. He still acts lighthearted and goofy some of the time later on, but by that time, he's been through some serious BreakTheCutie, and it [[SadClown seems that his humor is more of an attempt]] [[StepfordSmiler to cover up his darker thoughts and feelings]].
* ClassClown: Apparently, he was one prior to the Hunt.
* CollectorOfTheStrange: While Dan collects some normal things, such as baseball cards, he's also been known to collect odder things, like tombstone rubbings.
%%* DeadpanSnarker
* EmbarrassingFirstName: Dislikes being called "Daniel."
* FamilyEyeResemblance: Although he and Amy apparently don't look very much alike, they both have the same GreenEyes.
* FoolishSiblingResponsibleSibling: The [[AnnoyingYoungerSibling foolish]] to [[TheSmartGuy Amy]].
* GreenEyes: The fact that he and Amy, the heroes of the story, both have them is one of their first traits to be mentioned.
* GuysAreSlobs: He's been shown on several occasions to be very sloppy, especially when food is involved.
* HairOfGoldHeartOfGold: A male example.
* HeartwarmingOrphan: The first book kicks off with both his parents already dead and him heading to the funeral of the grandmother who was the closest thing he had to a caring parental figure. Despite this, he spends much of the first series as a [[FoolishSiblingResponsibleSibling cheerful jokester who provides levity, in contrast to his more serious older sister.]]
* HeroWithBadPublicity: Wanted by Interpol as of ''Cahills vs. Vespers''. However, he and Amy are only doing what they have to, cooperating with the Vespers to ensure the safety of the hostages.
* HeroicBSOD: [[spoiler: At the end of ''Storm Warning'', after Lester's death.]]
* HeterosexualLifePartners: With Atticus Rosenbloom.
* HypocriticalHeartwarming: Will get angry whenever anyone else insults/hurts his sister. It doesn't change the face that ''he'' also regularly makes fun of her, but it's sweet nonetheless.
%%* {{Keet}}
* JustifiedCriminal: Sure, he and Amy often break into places where they aren't supposed to be and steal international treasures, such a priceless painting, but it's often portrayed as justified, because if they don't do it first, one of their rivals with (assumedly) less pure intentions will.
* KidHero: Eleven in the first series, thirteen in the second series, and lovably immature in both.
* KindheartedCatLover: Like his sister, he's one of the nicest and most sympathetic characters (at least initially) and crazy about Grace's cat, Saladin.
* LittleMissConArtist: A male example, [[JustifiedCriminal when the situation calls for it]]. He may seem like an innocent kid, but don't be surprised to discover later that he's picked your pocket.
%%* MouthyKid
* NaiveNewcomer: To the world of the Cahills, at the start of the original series. By the SequelSeries, he's in just as deep as everyone else.
* NaughtyIsGood: He is a mischievous MouthyKid who [[AnnoyingYoungerSibling enjoys pestering his older sister]], but he's definitely one of the good guys.
* ParentalAbandonment: His parents were killed in a house fire.
* PhotographicMemory: As Amy notes, it isn't completely effortless. [[CharacterTics He holds his breath to make sure he'll remember.]]
* PursuingParentalPerils: He and Amy are searching for the 39 Clues, a quest that [[spoiler: resulted in their parents being killed in a fire by their clue-hunting rivals.]]
* RagsToRiches: Everyone who passed through the gauntlet gained two million dollars, twice the amount offered in Grace's will.
* RedOniBlueOni: The Red Oni to his sister Amy's Blue Oni.
* SadClown: Eventually becomes one of these.
* ScrewTheRulesImDoingWhatsRight: He and his sister will circumvent the rules if it's for the greater good. It's the reason for their roles as [[JustifiedCriminal Justified Criminals]].
* SiblingYinYang: With Amy. Dan is [[GenkiBoy hyperactive and excitable]] whereas Amy is [[ShrinkingViolet shy and withdrawn]].
* StepfordSmiler: Sometimes in ''Cahills vs. Vespers''.
* SweetTooth: Like many boys his age, Dan has a notable fondness for sweets and junk food.
* ThirteenIsUnlucky: Dan is thirteen years old in the SequelSeries and has a much more difficult time than in the first series, when he was eleven.
* TomatoInTheMirror: When he and Amy learn that they are [[spoiler: Madrigals]], whom they had previously feared.
* TookALevelInBadass: Between the first and second series.
* TwinTelepathy: Although they have a three-year age difference, he and Amy share a bond like this.
* UpbringingMakesTheHero: His and Amy's naivete in regards to the clue-hunting world is what gives them an edge against their competitors.

!!Amy Cahill

* AcademicAthlete: Becomes one after the clue hunt ends and she decides to start training for the next crisis.
* ActionGirl: Eventually becomes one, as exhibited nicely at the start of ''The Medusa Plot'' when [[spoiler: she kicks a gun out of a man's hand after her and Dan's school bus was attacked]].
* ActionSurvivor: Both she and Dan, until the start of Series Two.
* AllGirlsWantBadBoys: For Ian.
* BackToBackBadasses: With Dan in ''Day of Doom''.
* {{Bookworm}}: Called a "librarian in training," she's [[EstablishingCharacterMoment reading book when first introduced.]]
* BadassBookworm: She starts off [[ShrinkingViolet very easy on the "badass,"]] [[TheSmartGuy heavy on the "bookworm,"]] but then undergoes a lot of CharacterDevelopment.
* BelligerentSexualTension: Has this with Ian and, later, with Jake.
* BettyAndVeronica: The Archie in the center of the LoveTriangle. At the start of the SequelSeries, she's dating Evan, but then, she develops a lot of [[BelligerentSexualTension BST]] with Jake. At the end of ''Cahills vs. Vespers'', [[spoiler: Evan is KilledOffForReal, and for now, Amy is with Jake.]]
* BewareTheNiceOnes: Polite and kind, but...
* BewareTheQuietOnes: Don't let her shyness fool you: she's perfectly capable of defending herself and her family, as several of her enemies find out the hard way.
* BrainyBrunette: She has reddish-brown hair.
* BreakTheCutie: Goodness, yes. See also: [[spoiler: going into HeroicSafeMode in ''Trust No One.'' Not to mention the death of her boyfriend Evan in ''Day of Doom''.]]
* BrotherSisterTeam: With Dan.
* CharacterDevelopment: See her BadassBookworm entry.
* [[ChickMagnet Dude Magnet]]: Let's see, so far she's attracted the notice of Ian Kabra, [[GirlOfTheWeek Kurt]], [[UnderstandingBoyfriend Evan Tolliver]], and [[JerkWithAHeartOfGold Jake Rosenbloom]]... and that's to say nothing of the others who are supposedly into her in {{Fanon}}!
* CrushBlush: Naturally, as part of her ShrinkingViolet status.
* CuteBookworm: As stated above, she loves to read, and is extremely shy and prone to the blushing associated with this trope.
* DatingCatwoman: [[spoiler: Has a brief romance with Ian in ''The Sword Thief.'' This ends [[{{Understatement}} rather badly.]]]]
* DeadpanSnarker: At times, like most characters in the series.
* FamilyEyeResemblance: With Dan.
* FieryRedhead: After she shakes off most of her ShrinkingViolet behavior.
* FoolishSiblingResponsibleSibling: Responsible, in contrast to Dan.
* GirlNextDoor: Has the personality of one, but is the main character (or, [[BrotherSisterTeam one of them]]) herself.
* GreenEyes: The fact that she and her brother, the heroes of the story, both have them is one of their first traits to be mentioned.
* HeartwarmingOrphan: Like her brother, her parents were [[DeathByOriginStory lost in a fire before the series begun.]] Combined with her ShrinkingViolet personality (at least in the first series) and general niceness, makes her quite a sympathetic character.
* HeroWithBadPublicity: In the second and third series.
* [[spoiler: HeroicSafeMode]]: In the latter portion of ''Trust No One''.
* JustifiedCriminal: Sure, he and Amy often break into places where they aren't supposed to be and steal international treasures, such a priceless painting, but it's often portrayed as justified, because if they don't do it first, one of their rivals with (assumedly) less pure intentions will.
* KindheartedCatLover: Like her brother, she's one of the nicest and most sympathetic characters (at least initially) and crazy about Grace's cat, Saladin.
* LittleGirlsKickShins: In ''The Black Circle'', she kicks Ian in the shin--very hard.
* LoveDodecahedron: Is at the center of one, with four LoveInterests in {{Canon}}.
* LuminescentBlush: Prone to this when embarrassed.
* MeaningfulName: "Amy" means "beloved." See also: HeartwarmingOrphan; DudeMagnet.
* MementoMacGuffin: Grace's necklace that Amy always wears.
* NaiveNewcomer: At the beginning of the first series; by the SequelSeries, [[spoiler: she's the de facto head of the Madrigals]].
* OfficialCouple: At the start of ''Cahills vs. Vespers'', [[spoiler: she's dating Evan Tolliver, However, at the end of that series, he is killed in the fight against the Vespers, and she starts going out with Jake]].
* OppositesAttract: With Ian.
* OrphansPlotTrinket: The jade necklace that she inherited from Grace.
* PursuingParentalPerils: She and Dan are searching for the 39 Clues, a quest that [[spoiler: resulted in their parents being killed in a fire by their clue-hunting rivals.]]
* RagsToRiches: At the end of the first series, she and Dan become millionaires.
* RedOniBlueOni: The Blue to Dan's Red.
* SavvyGuyEnergeticGirl: Despite her calmness [[RedOniBlueOni in contrast to, say, her brother]], she is definitely the livelier in [[OfficialCouple her relationship with the easygoing Evan]]. She also has this dynamic with Ian and Jake, two of her other LoveInterests.
* ScrewTheRulesImDoingWhatsRight: She and Dan are forced to make the "abide by the law or do the right thing" decision a lot, and they inevitably do this.
* SheCleansUpNicely: Judging by Ian's uncharacteristic reaction to her wearing a fancy dress in ''Rapid Fire: Fireworks''.
* ShrinkingViolet: In the beginning. [[CharacterDevelopment By the last book, she's overcome a lot of it.]]
* SiblingYinYang: With Dan. Amy is [[ShrinkingViolet shy and withdrawn]], whereas Dan is [[GenkiBoy hyperactive and excitable]].
* SignificantGreenEyedRedhead: Auburn-haired and green-eyed, as well as the closest thing the series has to a protagonist.
* SingleWomanSeeksGoodMan: Her boyfriend as of ''Cahills vs. Vespers'' is NiceGuy Evan.
* SmoochOfVictory: Kisses Jake on the cheek (in front of her boyfriend Evan, no less) in ''The Dead of Night'' when Jake makes an important deduction.
* SpeechImpediment: Her stutter, though it lessens as the series goes on.
* TheLeader: Of the [[spoiler: Madrigals]] and, by extent, the Cahill family. She's a leader of the Levelheaded variety.
* [[TheSmartGuy The Smart Girl]]: Has almost an almost supernatural talent for doing research, and good at thinking on her feet.
* TomatoInTheMirror: Learns that she and Dan are [[spoiler: Madrigals]].
* TookALevelInBadass: Between the beginning of the Clue Hunt and the start of ''Cahills vs. Vespers''. Mousy ShrinkingViolet --> BadassBookworm ActionGirl.
* {{Tsundere}}: Can be a Type B to Ian and Jake.
* TwinTelepathy: Though not twins, she and Dan can communicate merely via facial expressions, without having to utter a word.
%%* UnkemptBeauty
* UnrequitedLoveSwitcheroo: Ian fell for her just as she was beginning to (allegedly) get over her crush on him--although ''Crushed'' later showed that she wasn't quite as "over him" as she believed herself to be.
* UpbringingMakesTheHero: Her and Dan's lack of knowledge about the clues gives them a unique perspective on [[SeriousBusiness the Hunt]], as well as keeps them from doing such reprehensible things as the other teams do to get clues.
* UptightLovesWild: Seems to be Jake's perspective, in which the [[ScrewTheRulesImDoingWhatsRight rule-breaking]] Amy is the "wild" one.
* YoungAndInCharge: [[spoiler: Becomes the head of the Madrigal branch and, to an extent, the Cahill family.]]

!!Nellie Gomez

* ActionGirl: On occasion.
* AdultsAreUseless: A definite subversion. (She's twenty in the first series and twenty-two in the second, by the way.)
%%* BadassDriver
* ChekhovsSkill: Has many talents that come in handy during the clue hunt.
* ContrivedCoincidence: Nellie's learned so many things that help the Cahills on their quest. Although near the end of the series it's revealed that [[spoiler: Grace knew she'd end up being their nanny one day, so she paid for plenty of Nellie's learning (such as being trilingual and knowing how to fly a plane).]]
* CoolBigSis: To Amy and Dan. [[spoiler: She becomes an actual "big sis" to them, or at least family, when she becomes one of their legal guardians at the end of the first series.]]
* DreadfulMusician: Apparently, Nellie's musical talent... leaves quite a bit to be desired.
%%* DrivesLikeCrazy
* HeadphonesEqualIsolation: Invoked; when Amy and Dan don't want her to listen to their conversations, they have her put her earbuds in.
* KindheartedCatLover: Not only is she one of the most consistently nice characters in the entire series, she love TeamPet Saladin.
* LessEmbarrassingTerm: She says she signed on as an ''au pair'' and not a nanny, despite the fact that the former is basically just GratuitousFrench for the latter.
* MamaBear: Though her relationship with Amy and Dan becomes more reminiscent of a sibling bond, this still applies.
* SpicyLatina: Part Mexican.
* TeamChef: Loves to cook and so is in charge of many of the meals.


The Cahills' pet Egyptian Mau. Originally belonged to Grace Cahill.

* ActionPet: It is implied that he helped Grace on her missions.
* CoolCat: See above. No wonder he stays so collected with Amy and Dan dragging him around the world on all their adventures!
* NonhumanSidekick: To Amy and Dan in the first series. As of ''Cahills vs. Vespers'', he is [[spoiler: safe in the Comm. Center, pestering Ian.]]
* TeamPet: Goes ''everywhere'' with Amy and Dan. If he's there, they probably are, too.
* TrademarkFavoriteFood: He ''loves'' red snapper--so much that, in ''One False Note'', he refuses to eat anything else. (However, in ''The Medusa Plot'', it's shown that he has also developed a taste for caviar.)


[[folder:Enemies in the Clue Hunt]]

!!Ian Kabra

Ian is introduced as Natalie's handsome, scheming older brother, befitting his status as a high-ranking Lucian. Like his sister, he joins the clue hunt on orders from his mother, whom he follows blindly. In ''The Sword Thief,'' [[spoiler: he plays on Amy's crush on him and uses her and Dan to get the Clue and leaves them for dead in a cave. This leaves him with a nagging feeling of guilt which culminates in his and Natalie's abandoning the Kabra family at the end of the series.]] As of the end of ''Cahills vs. Vespers'', [[spoiler: he is completely on his own, as both his mother and sister are dead, and his father is still in hiding.]]

* AbusiveParents: Just take a look at [[RichBitch who his]] [[MyBelovedSmother mother]] [[BigBad is]]...
* ActionFashionista: Shares the role with his sister and mother.
* AllGirlsWantBadBoys: Amy's early-series crush on him.
* AmbiguouslyBrown: He's described as having dark skin, but the only other clue to what ethnicity he may be is his last name.
* AnimalsHateHim: Poor Ian. Buffy hates him, Saladin hates him...
%%* BadassInANiceSuit
* BecomingTheMask: [[spoiler: His "IWasOnlyPretendingToLikeYou" toward Amy naturally stopped being such an act.]]
* BelligerentSexualTension: He and Amy have this during the Clue Hunt (and even a bit afterward).
%%* BeneathTheMask: Where to begin...
* BettyAndVeronica: The Veronica to Amy's Archie in terms of personality, but the Betty in that he seems to have known Amy for longer than Evan or Jake have. (He's said so himself: they have a [[ShipTease "considerable history."]])
%%* BigEgoHiddenDepths
* BreakTheHaughty: After his mother's betrayal, although he didn't take it as badly as Natalie. And then, it gets worse. In ''Cahills vs. Vespers'', [[spoiler: his sister is held captive by Vespers, and when they finally reunite, she is killed by the Vespers' Doomsday machine--actually bringing Ian to tears. Soon afterward, his mother dies, as well.]]
* BrokenAce: Let's see: devastatingly handsome, charming, [[AristocratsAreEvil very rich]],[[ManipulativeBastard manipulative]], [[BadassInANiceSuit badass]], can speak multiple languages and play the piano... but along with his many talents comes a lot of pressure and parental issues.
* BrotherSisterTeam: With Natalie.
* CannotSpitItOut: Toward Amy in ''Rapid Fire: Crushed.''
* ChickMagnet: He is said to have numerous girls fawning over him, though the only named character who has been shown to harbor an interest in him was Amy.
* ConflictingLoyalty: Faces a great deal of it in the latter half of the original series.
%%* DeadpanSnarker
%%* DefrostingIceKing
* DistractedByTheSexy: In ''Rapid Fire: Fireworks'', the great Ian Kabra is rendered stunned by the sight of Amy in a fancy gown.
* [[spoiler: EmancipatedChild: He and Natalie declare themselves this in ''Into the Gauntlet''.]]
%%* EvilBrit
* FireAndIceLoveTriangle: The Ice, in contrast to [[NiceGuy Evan's]] Fire.
%%* GentlemanSnarker
%%* [[spoiler:GoodFeelsGood]]
* HeelFaceTurn: At the end of Book [[spoiler:10]].
* HeterosexualLifePartners: With Evan in ''Day of Doom''.
* IWasOnlyPretendingToLikeYou: Pulls this on Amy...until it's revealed that he really does [[InLoveWithTheMark have a crush on her.]]
* InsecureLoveInterest: The reason why he decided not to confess his feelings for Amy in ''Crushed'' was due to the fact that, after letting his mother go, he felt that he didn't deserve Amy.
* {{Jerkass}}: At first, though he becomes more of a JerkWithAHeartOfGold later.
* JerkWithAHeartOfGold: Not that he'd be inclined to admit it.
%%* KidAnova
%%* LonelyRichKid
* ManipulativeBastard: See also: ''The Sword Thief''.
* MistreatmentInducedBetrayal: He and Natalie [[spoiler: left their mother]] after the events of ''Into the Gauntlet''.
* MommasBoy: [[spoiler: Until he changes his mind.]]
* [[DaddysLittleVillain Mommy's Little Villain]]: [[spoiler: Until ''Into the Gauntlet''.]]
* MyBelovedSmother: Isabel is ''very'' controlling, but not in the least loving. Ian might apply as a MommasBoy.
* Nominal Hero: In the SequelSeries. He is only [[spoiler: cooperating with the Cahill siblings]] because [[spoiler: the Vespers kidnapped his sister]]--[[AlternateCharacterInterpretation or so he claims]].
* NotSoStoic: He shows a lot more emotion than usual in ''Day of Doom''--especially after [[spoiler: his sister's death.]]
* OppositesAttract: With Amy.
* PrincelyYoungMan: The [[IceKingIce King]]/[[SpoiledBrat Spoiled Brat]] type initially, though it fades later on.
* PrivilegedRival: How better to quickly establish the Kabras as the Cahills' rivals by, during the first time the audience sees the two teams speak to each other, establishing that they have a private jet and make fun of Amy and Dan for not having money?
* RichesToRags: At least, in his opinion; although he and Natalie are still wealthy after [[spoiler: abandoning Isabel]], they aren't nearly as rich as before.
* SavvyGuyEnergeticGirl: Has shades of this with Amy.
* ScrewTheRulesIHaveMoney: He thinks that "laws are for poor people."
%%* SharpDressedMan
* SiblingsInCrime: With Natalie. [[spoiler: And then, their ''mother'' gets involved....]]
* SmartPeoplePlayChess: In ''One False Note'', readers are told that Ian is very intelligent, and this is demonstrated by his decision to play chess against a super-computer.
* SmugSnake: Or, one might say, a cocky [[IncrediblyLamePun Cobra]]. [[spoiler: He gets a little better after his HeelFaceTurn, although he definitely still has his moments of arrogance.]]
* SpoiledBrat: His parents raised him to think that being a Kabra makes virtually everything your birthright.
* StalkerWithACrush: ''Operation Trinity'' shows him watching Amy come home from school via a surveillance camera (although, technically, the crush didn't really manifest until later).
%%* TallDarkAndHandsome
%%* TallDarkAndSnarky
* TheBeautifulElite: He and his sister are immediately established as rich, well-dressed, well-traveled, charming, and - of course - unbelievably good-looking.
* TheProudElite: He's dark, described as very good-looking, and is extremely full of himself. He starts off pretty evil, [[spoiler: but turns out to have hidden morals]].
* TheRival: He and Natalie are a BrotherSisterTeam like Amy and Dan, but with more money and resources. Ian is Amy's age, and Natalie is Dan's.
* TokenEvilTeammate: In the SequelSeries, ''Cahills vs. Vespers'', at least initially.
* TooCleverByHalf: Is highly intelligent (he can beat a supercomputer at [[SmartPeoplePlayChess chess]]) but, as his sister notes, is somewhat lacking in common sense, which can lead him to make mistakes.
* [[spoiler: TookALevelInKindness]]: Although he still isn't the nicest guy in the world.
%%* TroubledButCute
* {{Tykebomb}}: Raised from birth to become a skilled Lucian clue-hunter.
* UnrequitedLoveSwitcheroo: Fell for Amy just as she was beginning to get over him.
%%* UpperClassWit
* UptownGirl: A GenderSwapped example in his romance with Amy.
* VillainousCrush: His feelings for Amy Cahill.
* WellDoneSonGuy: He's kind of a sucker for his mother's good opinion. As well as his father's, it would seem from ''The Black Circle''.
* WickedCultured: His parents own an art dealership, and he has the appropriate education, [[PrivilegedRival and of course he can Mozart beautifully when presented with a piano, in contrast to the heroic Amy, who stumbles because her Aunt Beatrice stopped paying for her lessons.]]

!!Natalie Kabra

Ian's younger sister who is just as scheming as he is. She dislikes doing dirty work and aspires to please her mother in every way. She starts out as a RichBitch but by the end of the series [[spoiler: she and Ian realize that [[MachiavelliWasWrong they were following Isabel mostly out of fear and leave the Kabras once she is thrown in prison.]]]]

* ActionFashionista: She's quite handy with dart gun, and dreams of someday shopping in every country.
* AfraidOfBlood: ''Hates'' the stuff, and strongly resists going near Nellie when the latter is wounded.
%%* AllWomenLoveShoes
* AmbiguouslyBrown: She's described as having dark skin, but the only other clue to what ethnicity she may be is her last name.
* AnnoyingYoungerSibling: To Ian, occasionally. However, they are shown to care deeply for each other, just like Amy and Dan do.
%%* BigEgoHiddenDepths
* BrattyHalfPint: Initially.
* BreakTheHaughty: [[spoiler: Her mother drinking the Lucian serum, then trying to kill her and Ian.]]
* BrotherSisterTeam: With Ian.
* DefrostingIceQueen: A non-romantic example.
* DependingOnTheWriter: While most characters suffer from this, it's especially apparent with Natalie. In the seventh book, she gets sick at the mention of violence. The next books describes her "merciless, piercing eyes."
* [[spoiler: EmancipatedChild: She and Ian declare themselves this in ''Into the Gauntlet''.]]]]
%%* EvilBrit
* TheFashionista: Natalie is always whining about something spoiling her designer clothes.
* GirlyBruiser: A villainous version. [[spoiler: At least, initially.]]
%%* [[spoiler: GoodFeelsGood]]
* [[spoiler: HeelFaceTurn: In the tenth book.]]
* [[spoiler: KilledOffForReal]]: In ''Day of Doom''.
%%* LonelyRichKid
* [[spoiler: MistreatmentInducedBetrayal: She and her brother had their HeelFaceTurn after their mother's treatment became too awful to bear.]]
* [[DaddysLittleVillain Mommy's Little Villain]]: [[spoiler: Until the last book.]]
* PrivilegedRival: Like her brother, she quickly makes her rival status known by teasing Amy and Dan for not having as much money as she and her brother.
%%* RichBitch
* RichesToRags: After their HeelFaceTurn and disowning their mother.
* ScrewTheRulesIHaveMoney: Throughout the series.
* SiblingsInCrime: With Ian.
* SpoiledBrat:m Her parents taught her that being a Kabra makes virtually everything your birthright.
* TheBeautifulElite: She and her brother are immediately established as rich, well-dressed, well-traveled, charming, and - of course - unbelievably good-looking.
* TheRival: She and Ian are a BrotherSisterTeam like Amy and Dan, but with more money and resources. Ian is Amy's age, and Natalie is Dan's.
%%* [[spoiler: TookALevelInKindness]]
* {{Tykebomb}}: Like Ian, she was trained by her mother to become a clue-hunter and dangerous Lucian agent.
* UptownGirl: She and Ian are a GenderSwapped example.

!!Alistair Oh

A South Korean businessman hailing from Seoul, Alistair made his fortune from selling the microwavable burrito. But by the time of the series his money is running out and he swaps the million dollars for a hint to the first clue. He is an Ekaterina. Throughout the series often offers to help Amy and Dan, but they are openly distrustful of him, as he seems fond of double-crossing them.
%%* CoolOldGuy
* FriendlyEnemy: He may be a rival to Amy and Dan in the clue hunt, but he's always perfectly polite and nice to them, even when he's stabbing them in the back.
* HeelFaceRevolvingDoor: Amy and Dan can never tell whether to trust him. His record of both helping them and leaving them behind is constantly growing.
* InscrutableOriental: Alistair is always polite, even at the worst of times.
* IntergenerationalFriendship: With Amy and Dan--well, [[FriendlyEnemy sort of]]. [[spoiler: Becomes purely a friend later on, once he joins the Madrigals.]]
* InventorOfTheMundane: His money comes from his invention of his pride and joy, the microwavable burrito.
* KilledOffForReal: As of [[spoiler: ''Trust No One''.]]
* NeverFoundTheBody: ''The Sword Thief'': While escaping a cave in Korea. Amy and Dan seem genuinely grieved by his death - until they find his glove and realize that he must have left them.
%%* ObfuscatingStupidity
* [[spoiler: ObiWanMoment: Spends his final moments either telling the others to be brave or that they ''are'' brave.]]

!!Irina Spasky

->"You are afraid of everything except what you should fear."

A Lucian ex-KGB agent who agrees to trade the one million dollars for a hint to the first clue at Grace's funeral. Throughout the series, Irina works behind the scenes, following Amy and Dan and threatening people with her poisons. By the time the sixth book rolls around, however, it's revealed that [[HiddenDepths there's way more to her than we originally thought]].

* ADeathInTheLimelight: ''In Too Deep'' gives her character a lot of development. She [[spoiler: dies at the end of the book.]]
* ActionGirl: A grown-up version. She was a KGB agent, after all.
* DarkActionGirl: As a former KGB agent in an American series, naturally she's a pretty shady - and dangerous - character.
* HeelFaceTurn: Genuinely wants to [[spoiler: help Amy and Dan by ''In Too Deep''.]] That doesn't end up too well for her.
%%* HiddenDepths: And wouldn't you know.
%%* IncrediblyObviousTail
* KilledOffForReal: Sacrifices her life [[spoiler: saving Amy, Dan, and Alistair from a fire set by Isabel.]]
* MistreatmentInducedBetrayal: What caused her to [[spoiler: betray Isabel.]]
%%* PerfectPoison
%%* RedemptionEqualsDeath
* RogueAgent: So she claims. In actuality, she works for Isabel. [[spoiler: Look where that got her.]]
* [[RussianGuySuffersMost Russian Girl Suffers Most]]: [[spoiler: She lost her son, was treated as a servant by Isabel, and finally dies in a fire when Isabel sees it a bother to rescue her.]]
* SacrificialLion: You know the newly-introduced Isabel is a real threat when Irina dies in the fire she set. That wasn't Isabel's goal (she was after Amy, Dan, and Alistair instead, but it's the first fatality of the hunt and after several books without a casualty, the death drives home how dangerous the competition is.

!!Jonah Wizard
International hip-hop sensation and teen idol, Jonah fits very nicely into the family's Janus branch. His mother is the famous Cora Wizard, who set up his career. Jonah joins the clue hunt to please her [[spoiler: because she wants the master serum for herself]]. At the beginning he is only concerned about his public image, but after he befriends Dan in ''The Emperor's Code'' this begins to change. [[spoiler: Because of his concern of what other people think of him, he doesn't let anyone know about his secret love of Shakespeare's works.]]

* BigBrotherMentor: Plays this role to Dan in ''The Emperor's Code.''
%%* BigEgoHiddenDepths
* ChekhovsSkill: Who knew his love of Shakespeare would seriously come in handy [[spoiler: in the gauntlet?]]
* ChickMagnet: Naturally, seeing as he's a world-famous musician.
* DamnItFeelsGoodToBeAGangster: Even though he lives in a nice, comfortable home in Beverly Hills.
* EverythingSoundsSexierInFrench: He can speak it.
* FanGirl: Has ''plenty.'' ''Everywhere.''
* FriendlyEnemy: Later on in the Clue Hunt.
* HeterosexualLifePartners: With Hamilton in ''Cahills vs. Vespers''.
* IdolSinger: He's a world-famous hip-hop star, with the FanGirls, merchandise, and ego to go with it.
%%* {{Jerkass}} --> JerkWithAHeartOfGold
%%* JiveTurkey
%%* KidAnova
* MommasBoy: [[spoiler: Until he defies Cora and the two become estranged.]]
* {{Paparazzi}}: Is constantly plagued by them, which makes his job as a Janus agent difficult.
* RhymesOnADime: On occasion.
* TeenIdol: See his IdolSinger entry.
* TheseHandsHaveKilled: After shooting [[spoiler: Luna Amato]] at point-blank range in ''Shatterproof''.
* WellDoneSonGuy: He wants his mother's approval.

!!The Holts
A Tomas family consisting of Eisenhower Holt, his wife Mary-Todd, and their children Hamilton, Madison, and Reagan, the Holts excel at everything athletic but are not the brightest crayons in the box. Out of the five of them, Hamilton is the most sympathetic, and is the one who forms alliances with Amy and Dan. [[spoiler: He was the one who went into the gauntlet, and as such the rest of the family was taken hostage by Isabel Kabra.]]

* AcademicAthlete: Hamilton.
* ActionGirl: Reagan and Madison, naturally.
* AlliterativeName: Hamilton Holt.
* BadassFamily: You know it.
* BigBrotherInstinct: Hamilton seems to show a bit toward Dan and Amy later on in the first series. Once, he protectively refers to Dan as "my little buddy."
* BoisterousBruiser: Especially Eisenhower.
* CharacterDevelopment: By the end of ''Into the Gauntlet,'' Eisenhower has ''seriously'' undergone this.
* DumbBlonde: The Holts are blonde and, usually, not very bright.
* DumbMuscle: But sometimes, they might surprise you.
* {{Flanderization}}: Hamilton started off as a GeniusDitz who could barely read, but had a talent with computers. By ''The Medusa Plot'', though, he's portrayed as [[GeniusBruiser actually a pretty smart guy who did really well on the SAT.]]
* FriendlyEnemy: Hamilton.
* {{Geek}}: Hamilton knows a lot about computers.
* GenkiGirl: ''Day of Doom'' compares Reagan to the Energizer Bunny, as she is constantly [[spoiler: keeping the other hostages active and helping them keep their strength up]].
* GeniusBruiser: Hamilton has a talent with computers and did well on his UsefulNotes/SATs.
* HairOfGoldHeartOfGold: Hamilton is a male example.
* HappilyMarried: Eisenhower and Mary-Todd.
* HeterosexualLifePartners: Hamilton with Jonah in the SequelSeries.
%%* JerkWithAHeartOfGold
* LovableJock: Hamilton.
* MeaningfulName: Eisenhower and his children are named after presidents of the United States.
* SickeninglySweethearts: Mary-Todd and Eisenhower, surprisingly. For such aggressive people, they sure are openly affectionate with each other.
* StraightGay: Hamilton.
* ThemeTwinNaming: Madison and Reagan.
* [[TheBigGuy The Big Guys]]: ''The whole family.''
* TookALevelInKindness: Whereas family gatherings once meant the whole family harassing Dan and Amy, they become much less violent after the clue hunt and Hamilton becomes a friend.

!!The Starlings
Genius thirteen-year-old triplets who turn down their three million dollars in favor of the Clue Hunt. All three are Ekaterina. They don't stick around, however -- [[spoiler: in the very first book they are severely injured and hospitalized by a blast set up by the Holts for Amy and Dan. They don't appear again until Book 10, wherein it's shown that Ted was blinded by the blast and can only see light and dark, whereas Ned frequently has migraines that interrupt his ability to think.]] Out of the three it's Sinead who we get to see the most of because [[spoiler: she was the least injured.]] In the Cahills vs. Vespers Mission 4, Sinead is revealed to be [[spoiler: working for the Vespers: as Vesper Three, TheMole, in fact.]] However, [[spoiler: she makes a HeelFaceTurn]] in ''Day of Doom''.

* ActionGirl: Sinead. See the end of ''The Medusa Plot'' for further details.
* AlliterativeName: Sinead Starling.
* BigBadFriend: Is [[spoiler: the Vesper Mole]], to her best friend Amy's dismay.
* [[BrainyBrunette Brainy Brunettes]]: Have auburn hair.
* BreakTheHaughty: [[spoiler: Sinead after the explosion. This may have prompted her face heel turn.]]
* TheBusCameBack: She and her brothers are out of the hospital by ''Into the Gauntlet''.
* DisabilitySuperpower: Hinted at. They decline the offer of the serum even though it could cure their injuries because they want to develop something that would help other people suffering from the same thing.
* EvilRedhead: Sinead, although she later realizes her error and makes a HeelFaceTurn.
* FaceHeelTurn: Sinead is revealed to be [[spoiler: Vesper Three, the Mole.]] Not that she was incredibly kind in Maze of Bones as a Cahill, but still.
* {{Fangirl}}: In an online mission, Sinead is revealed to be a big fan of Music/TaylorSwift.
* FieryRedhead: Sinead.
%%* GadgeteerGenius
* GreenEyes: Sinead, at least, is mentioned to have them; no canonical word on her brothers'.
* HeelFaceTurn: Sinead rejoins the side of the [[spoiler: Cahills in ''Day of Doom''.]]
** HeelFaceRevolvingDoor: She starts out as an enemy, then turns good at the end of ''Into the Gauntlet'', then becomes TheMole for the Vespers, then joins the Cahills again.
%%* PlayfulHacker
* PutOnABus: Almost at the very beginning of the Hunt. (Well, it was really more like an ambulance). [[spoiler: However, TheBusCameBack]].
* SacrificialLion: Although they're not killed, the Starlings are severely injured early on in the clue hunt to show the readers that the competition is Very Dangerous.
* SiblingTeam: Together, the three triplets make up Team Three of the clue hunt.
* SignificantGreenEyedRedhead: Sinead. Her significance is that she's a TeenGenius, as well as Amy's best friend. [[spoiler: And--oh, yeah--the Vesper Mole.]]
* [[TeenGenius Teen Geniuses]]: All three of them.
* TheMole: [[spoiler: Sinead.]]
* [[ThemeTwinNaming Theme Triplet Naming]]: Ned, Ted, and Sinead.
* TookALevelInKindness: [[spoiler: Although, in Sinead's case, it was at least partially phony.]]
* WellIntentionedExtremist: [[spoiler: Sinead is working with the Vespers in hopes of being able to cure her brothers. When she realizes that the Vespers will not be able to help her, she makes a HeelFaceTurn and rejoins the Cahills.]]


[[folder:Other Major Characters]]

!!Grace Cahill
Beatrice's younger sister, [[spoiler: Fiske's older sister]], Hope's mother, and Amy and Dan's grandmother, she was one of the last genuinely nice Cahills. After she dies of sickness she chooses some of her relatives, the ones most likely to succeed in the clue hunt [[spoiler: and by extension the gauntlet]], and offers either one million dollars or a hint to the first clue to them. Amy and Dan really were her favorites, and they spent almost every weekend with her. [[spoiler: She was a Madrigal.]]

* ActionGirl: Shown to be this when she was younger.
* ChekhovsClassroom / SomedayThisWillComeInHandy: The little tidbits of information she gives Amy and Dan ''help'' in the clue hunt.
%%* CoolOldLady
* DeathByOriginStory: Her death kicks off the series.
%%* [[spoiler:MiddleChildSyndrome]]: Averted.
%%* NeverMessWithAGranny
* KindheartedCatLover: One of the few family members who are kind to Amy and Dan before the clue hunt, and very fond of her pet, Saladin.
%%* PosthumousCharacter

!!Arthur Trent and Hope Cahill
Amy and Dan's parents. They died in a fire [[spoiler: set by Isabel Kabra (accompanied by Alistair, Irina Spasky, Cora Wizard, and Eisenhower Holt and his wife) after they refused to share information]] and were avid [[spoiler: Madrigal]] clue hunters. Arthur was the one who got Eisenhower expelled from West Point Military Academy.

* AdventurerArchaeologist: Hope was one.
%%* DeadToBeginWith
* DeathByOriginStory: They were killed in a fire prior to the events of the first series.
* DeceasedParentsAreTheBest: Played with a bit. Though Amy and Dan initially remember their parents nothing but fondly, once [[spoiler: they learn that they were Madrigals]], their feelings are briefly called into check. In the SequelSeries, something similar happens when the siblings find out that [[spoiler: Arthur was a Vesper]].
* DefectingForLove: When Arthur met Hope Cahill, he was [[spoiler: a Vesper. He stopped his Cahill-hating ways once he married her.]]
%%* DisappearedDad
%%* MissingMom
%%* ParentalAbandonment

!!The Man In Black/[[spoiler: Fiske Cahill]]
Initially, a mysterious character who seems to be following the Cahill siblings as they hunt for clues. He turns out to be [[spoiler: Beatrice and Grace's younger brother, Amy and Dan's great-uncle.]]

* [[BadassGrandpa Badass Great Uncle]]: Shows some serious combat skill in ''Day of Doom''.
%%* CoolUncle
* LongLostRelative: The Cahills' great-uncle.
* RightHandVersusLeftHand: Amy and Dan initially see him as an enemy, but realize that they're playing on the same team.
* ShrinkingViolet: He's nearly as shy as Amy is before she undergoes major CharacterDevelopment.
* TheMenInBlack: Is referred to as one throughout the series all the way until Book 9.
* TheStoic: Was this in his younger years.
* WalkingSpoiler: His actual purpose and identity are kept secret until the ninth book.

!!Isabel Kabra
Ian and Natalie's mother, a Lucian whose elegant and superficial exterior conceals a great deal of wickedness. [[spoiler: She is the BigBad of the first series.]] In ''Cahills vs. Vespers'', [[spoiler: she is revealed to be Vesper Two, but after the death of her daughter, she consumes the master serum and kills innumerable Vespers and even Damien Vesper himself, though she dies in the process.]]

* AbusiveParents: And how. To her, the safety and mental health of her children are a small price to pay to accumulate power.
%%* ActionFashionista
* BigBad: Of the first series. In the SequelSeries, [[spoiler: she is the Dragon to Vesper One but ends up taking him down in a blaze of glory.]]
* BitchInSheepsClothing / WoundedGazelleGambit: [[spoiler: Her ticket out of prison is starting an organization dedicated to global disaster relief.]]
* CuteAndPsycho: A grown-up version.
* DyingMomentOfAwesome: Kills innumerable Vesper mooks effortlessly and [[spoiler: manages to take out Vesper One himself]] after consuming the master serum, dying as she destroys the Doomsday machine that killed her daughter Natalie.
%%* EvilBrit
* EvilMatriarch: [[spoiler: Until the very end of ''Day of Doom'', when she becomes a MamaBear, consumes the serum, and goes on a RoaringRampageOfRevenge after Natalie's death.]]
* EyesOfGold: Has amber eyes like her children.
%%* FauxAffablyEvil
* KilledOffForReal: In [[spoiler: ''Day of Doom''.]]
* spoiler: KillEmAll: Her plan in the gauntlet.
* MamaBear: See also: DyingMomentOfAwesome, above.
%%* ManipulativeBitch
* MistreatmentInducedBetrayal: The reason why Irina and her own children abandoned her.
* MyBelovedSmother: To her children.
* PinocchioNose: Ian notes the corner of her lip tightening when she lies.
* [[spoiler: TheDragon: To Vesper One, seeing as she is Vesper Two.]]
%%* TheFakeCutie
* TheFashionista: She can have you murdered and look good doing it.
* WellDoneSonGuy: Both of her children seek to gain her approval (especially Natalie).
* WithGreatPowerComesGreatInsanity: After she drinks the Lucian part of the master serum (giving her ultimate intelligence and strategic skills) it's hinted she finally snaps.
* [[spoiler: [[YouKilledMyFather You Killed Our Parents]]]]: Amy and Dan towards Isabel (along with others). But she takes the chief blame for [[spoiler: acting like a cocky idiot and burning the house down recklessly, along with threatening their child.]]


[[folder: Other Minor Characters]]

!!Bae Oh
Alistair's uncle, who raised him after the death of his father [[spoiler: who Bae killed]]. He is the leader of the Ekaterina branch [[spoiler: or at least, he was]].

* EvilUncle: He's completely willing to murder family members if it gets him somewhere. Then again, that's not so unusual for Cahills... but Bae's willing to kill ''immediate'' family members, which seems to be much more taboo among them.

!!Cora Wizard
Jonah's mother.

%%* EvilMatriarch
%%* MyBelovedSmother
* WellDoneSonGuy: To Jonah.

!!Broderick T. Wizard
Jonah's father.

* CharacterTics: His [=BlackBerry=] is perpetually in his hands.
* ConflictingLoyalty: Eventually, between his wife and their son. [[spoiler: He chooses Jonah.]]
* HenpeckedHusband: To Cora, it seems.

!!William [=McIntyre=]
Grace Cahill's lawyer and a friend to Amy, Dan, and [[spoiler: Fiske]]. He is [[spoiler: KilledOffForReal]] in the ''Cahills vs. Vespers'' series.

%%* KilledOffForReal
%%* SacrificialLion

!!Shep Trent

* CoolUncle: Amy and Dan call him "uncle," even though he was actually their father's cousin. (He and Arthur grew up thinking of each other like brothers.)
%%* SurferDude

!!Nataliya Ruslanova Radova

* DoubleAgent: For [[spoiler: the Madrigals.]]


* ChuckCunninghamSyndrome: ''The Viper's Nest'' seemed to be setting him up as a possible LoveInterest for Amy; however, he's never heard from again.
* OneShotCharacter: Only appears in one book.
%%* SmartPeoplePlayChess

A helpful young man that the Cahills encounter in ''Storm Warning''.

* CruelAndUnusualDeath: Death by [[spoiler: drowning in quicksand]]--after he got caught in it when he was trying to help Isabel's henchmen get out of it.
%%* [SacrificialLamb

!!Beatrice Cahill
Grace's [[spoiler: and Fiske's]] older sister, an eccentric old woman who could care less about the Cahill family history. [[spoiler: It's revealed in the "Black Book of Buried Secrets" that this is only so because she couldn't handle the pressure put on by her sister and brother, who excelled in all the tests.]]

* CrazyCatLady: She has a thing for ceramic cats.
* ElderlyBlueHairedLady: Mentioned as having blue hair in ''Maze of Bones''.
* {{Jerkass}}: Is ''beyond'' nasty to her great-niece and nephew.
* KilledOffForReal: Killed by [[spoiler: The Outcast in ''Mission Hindenburg''.]]
* MaidenAunt: She would fit the trope if Amy and Dan were remotely fond of her. Instead, she is merely a...
* ResentfulGuardian: She clearly resents being saddled with her sister's grandchildren. Amy and Dan feel the same about her and don't mind being taken care of primarily by a series of au pairs.
* YouShouldHaveDiedInstead: Actually feels this way towards [[spoiler: Fiske, because [[DeathByChildbirth their mother died giving birth to him.]]]]

!!Vikram Kabra
The father of Ian and Natalie and the husband of Isabel. Thus far, he has not appeared in the series in the flesh.

* AbusiveParents: Definitely emotionally abusive, at the very least.
* ParentalNeglect: After his wife was put in prison, he fled to Brazil, deserting his children.
* WellDoneSonGuy: Ian craves his approval, according to ''The Black Circle''.


[[folder: Characters From the SequelSeries, ''Cahills vs. Vespers'']]

!!Evan Tolliver
Introduced in ''Vespers Rising'' as a boy who goes to school with Amy and Dan. In ''The Medusa Plot'', he has been [[spoiler: dating Amy]] for several months. After the Cahills fend off an attack by the Vespers in full view of Evan, he becomes understandably confused, and gets even more confused and upset when Amy cuts off contact with him in fear of him finding out about her family history. Eventually, however, Evan does find out about the Cahill story, as a result of his [[{{Geek}} immediately being able to identify the obscure type of cell phone that Vesper One is using.]] Also because of this, Evan is invited to join Ian and Sinead at the Cahill Command Center, and helps them do research to aid Amy and Dan in their missions around the world. Evan is still helping the Cahills in ''A King's Ransom'' and ''The Dead of Night'', and is becoming increasingly worried about Amy. In ''Day Of Doom'', [[spoiler: he is shot and KilledOffForReal]].

* {{Adorkable}}: At least to his girlfriend, who thinks of him as being this.
* BettyAndVeronica: The [[NiceGuy Betty]] to Amy's Archie and to Ian or Jake's Veronica.
%%* BrainyBrunette
* DeathOfTheHypotenuse: He dies in [[spoiler: ''Day of Doom''.]]
* DyingMomentOfAwesome: Although previously a NonActionGuy, he [[spoiler: helps the Cahills in the fight against the Vespers in ''Day of Doom'']] and seems to be fairly good at it. It is during this fight that he is fatally wounded by a gunshot.
* FireAndIceLoveTriangle: The Fire, in contrast to [[TheProudElite Ian]] or [[JerkWithAHeartOfGold Jake]].
* {{Geek}}: He knows a lot about computers and technology.
* HeterosexualLifePartners: With Ian in ''Day of Doom''.
* KilledOffForReal: In [[spoiler: ''Day of Doom''.]]
* KindheartedCatLover: Takes good care of [[TeamPet Saladin]] while Amy and Dan are away from Attleboro.
* NerdsAreSexy: Amy finds him completely {{Adorkable}}.
* NiceGuy: And seeing [[TallDarkAndSnarky who he's up against]], this gives him a distinct disadvantage.
* NonActionGuy: In contrast to [[ActionGirl his girlfriend]]. However, [[spoiler: he fights fairly well alongside the Cahills in ''Day of Doom''... although he dies in the process.]]
* SavvyGuyEnergeticGirl: With Amy.
* SecondLove: To Amy, after Ian.
* SingleWomanSeeksGoodMan: Amy does, and that good man is Evan--[[spoiler: although her affections slowly switch targets to Jake]].
* SmartPeopleWearGlasses: In case his talent with technology didn't establish him enough as a nerd and appropriate love interest for Amy, he also wears glasses.
* StalkerWithACrush: Shows shades of this in ''The Medusa Plot'' after [[spoiler: Amy cuts off contact with him due to problems with the Vespers]], going so far as to sneak onto the grounds of Grace's mansion to find out what's going on. This behavior stops once [[spoiler: Ian explains the Cahill-Vesper conflict to him.]]
* TakingTheBullet: ''Tries'' to do this for Amy when Vespers stop the schoolbus and confront the Cahill siblings in the beginning of ''The Medusa Plot''. Rather oddly [[SubvertedTrope subverted]], as by this time Amy has gone through CharacterDevelopment and proceeds to kick the gun out of the man's hand and hold off the attackers with her martial arts skills. [[spoiler: In ''Day of Doom'', he ''does'' end up taking a bullet, although not for any other character in particular.]]
* UnderstandingBoyfriend: Not only is he far more understanding than many people would be, but he is also very helpful to the cause.

!!Casper Wyoming
A character, not the place. A Vesper who was named after a city where his parents robbed a bank. He's proud of that. [[spoiler: He was formerly Vesper Six, until his twin sister Cheyenne took his place.]]

* BrotherSisterTeam: With Cheyenne, although he harbors a bit of resentment toward her for [[spoiler: replacing him as Vesper Six]].
%%* FauxAffablyEvil
%%* ForTheEvulz
* SiblingsInCrime: He and Cheyenne--and seeing as their parents named them after bank robberies they committed, it apparently runs in the family.
* ThemeTwinNaming: Both he and Cheyenne are named after their parents' bank robberies in ([[AddedAlliterativeAppeal alliterating]]) cities in Wyoming.

!!Cheyenne Wyoming
Like [[ThemeTwinNaming her twin, Casper,]] Cheyenne is a character not to be confused with the city. She is pretty dangerous, especially when she's working alongside her brother. [[spoiler: She is Vesper Six.]]

* BrotherSisterTeam: With Casper, though she has shown a willingness to sabotage him if it suits her purposes.
%%* FauxAffablyEvil
%%* MasterofDisguise
* SiblingsInCrime: With Casper.
* ThemeTwinNaming: Cheyenne and Casper Wyoming.

!!Atticus Rosenbloom
A genius eleven-year-old friend of Dan's.

%%* {{Adorkable}}
%%* BlackAndNerdy
* CatchPhrase: "In actuality..."
* ChildProdigy: And how. Eleven years old, and he's completed high school in his "spare time."
* HeterosexualLifePartners: With Dan.

!!Jake Rosenbloom
The older brother of Atticus.

* BelligerentSexualTension: With Amy.
* BettyAndVeronica: The Veronica in the Evan/Amy/Jake LoveTriangle. (No say on which role he would take when contrasted with Ian.)
* BigBrotherInstinct: His display of this for his little brother is what causes Amy to decide he isn't so bad, after all.
* FireAndIceLoveTriangle: The Ice, as opposed to Evan's Fire.
%%* JerkWithAHeartOfGold
* [[spoiler: OfficialCouple: With Amy, as of ''Day of Doom''.]]
* SavvyGuyEnergeticGirl: Downplayed, but still visible, when he and [[FieryRedhead Amy]] are working together.
* [[spoiler: SmoochOfVictory: Amy gives him a jubilant kiss on the cheek in ''The Dead of Night'' when he makes a big discovery, leading a stunned Jake to utter the infamous "Wore yelcome."]]
%%* TallDarkAndSnarky
* ThirdOptionLoveInterest: For Amy Cahill. [[spoiler: She chooses him in ''Day of Doom'', though it remains to be seen whether this relationship will last in the third series or not.]]
* {{Tsundere}}: A male version.
* UptightLovesWild: The "uptight" in contrast to [[JustifiedCriminal Amy's]] "wild." However, once he realizes why the Cahills do the things they do, he loosens up a bit.

!!Milos Vanek
An Interpol agent tracking Amy and Dan across the globe.

* BadassNormal: Well, he's not a Cahill, Vesper, or Guardian, as far as we know, but he still manages to be a fairly epic guy.
* ChuckCunninghamSyndrome: He was chasing Amy and Dan for most of the second series, and even temporarily got them a couple of times. He was featured prominently in ''Shatterproof'' and then was never mentioned again.
%%* InspectorJavert
* ReasonableAuthorityFigure: Not at first, but he begins to show shades of this in ''Shatterproof''.

!!Luna Amato
An Interpol agent who trails Dan and Amy through Europe.

* AffablyEvil: Initially treats Amy and Dan kindly, but actually [[spoilers: is a Vesper.]]
* KilledOffForReal: Dies when [[spoiler: Jonah]] shoots her.


[[folder: Ancestral Cahill Family]]

!!Gideon and Olivia Cahill
The parents of Luke, Katherine, Thomas, and Jane Cahill, [[spoiler: as well as Madeleine]]. Gideon invented the master serum which is made by combining the 39 ingredients revealed by following the eponymous Clues.

!!Luke Cahill
The oldest Cahill sibling, and the founder of the Lucian branch.

* BadassCape: Wears one later in life, when he works as a royal advisor. It adds to his menacing appearance.
* GreenEyes: He apparently inherited them from his mother Olivia.

!!Katherine Cahill
The second-oldest Cahill sibling, who founded the Ekaterina branch.

%%* TheSmartGuy

!!Thomas Cahill
The third-oldest Cahill child and the founder of the Tomas branch.

%%* TheBigGuy

!!Jane Cahill
The youngest Cahill [[spoiler: not counting Madeleine]] and the founder of the Janus branch.

!![[spoiler: Madeleine Cahill]]
The last child of Gideon and Olivia Cahill, born after Gideon's death, who founded the Madrigal branch.

* ReconcileTheBitterFoes: Wants her siblings to stop fighting.
* WalkingSpoiler: For obvious reasons.


[[folder: Characters From the ''Unstoppable'' Series]]

!!J. Rutherford Pierce

* CorruptCorporateExecutive: Head of a media empire, a position he abuses to destroy the reputations of Amy and Dan and garner support for a presidential run (as a stepping stone to world dominance.)
%%* DespotismJustifiesTheMeans
* [[WomanScorned Man Scorned]]: He never forgave Hope Cahill for turning him down, and since someone already beat him to the punch in killing her, he decides to take it out on her children. With slander - and murder.
* TakeOverTheWorld: His goal is to use the presidency to turn the United States into a dictatorship and then start a world war in order to rule the world.
* WellDoneSonGuy: To his children, Galt and Cara
* VillainWithGoodPublicity: He's a media mogul, so of course the media loves him, at least if they want to keep their jobs.

!!April May/[[spoiler: Cara Pierce]]

* FriendlyEnemy: With Pony.
* {{Geek}}: One of the best computer hackers in the world.
* WalkingSpoiler: She keeps true identity [[spoiler: as Pierce's daughter, Cara]] a closely-guarded secret.