'''[[YouHaveBeenWarned UNMARKED SPOILERS]]'''.

[[folder:Milo James Thatch]]
[[caption-width-right:350:''"But hey, you know, that's what this is all about, right? I mean, discovery, teamwork, adventure!"'']]

-->''"--Now what’s really amazing is that if you deconstruct Latin, overlaid it with a little Sumerian, throw in a dash of Thessalonian, you’d be getting close to their grammatical structure. Or at least in the same ballpark. Which is almost exactly like certain obscure offshoots of Chocktaw! Well, obviously using Greek pronunciation, but you get the point, proving once and for all, that Atlantean trade routes accessed the new world centuries before the Bronze Age! Take that, Mr. Harcourt!"''
--->'''Voiced by:''' Creator/MichaelJFox

A linguist and cartographer at the Smithsonian who was recruited to decipher The Shepherd's Journal while directing an expedition to Atlantis.
* {{Adorkable}}: He's a proficient linguist and an idealistic adventurer who also trips over his words around attractive women.
* AllOfTheOtherReindeer:
** The directors of the museum thought he was a nutcase, like his grandfather.
** He's was the outsider and the butt of a lot of jokes when he joins Rourke's team, though they do grow closer to him over time, [[spoiler:to the point where he can win them over from Rourke when he tries to steal the crystal]].
* BadassBookworm: Milo [[TookALevelInBadass becomes this]] during the last action sequence.
* ABoyAndHisX:
** A Man and his Cat. Prior to the film's adventure, he lived alone in an apartment with his pet cat.
** A Man and his Lava Dog- In the sequel Milo and Kida own a lava dog named Oggie.
* BrainyBrunette: Milo has brown hair and let's look at the info below:
** Educated at Oxford University (1896-1903), Thatch holds a double doctorate in the fields of Linguistic Theory (Grammatical Structure, Syntax, Babel Theory, Evolution, Written Languages, and Lost Alphabets) and Dead Languages (Cryptology and Hieroglyphics, with thesis work done on American Indian tribes of the California Coast, Hawaiian, Pacific Island, and South Asian/Sub-Continent Strains).
** He had minor degrees in Chemistry, Literature (French, Old English, and Chinese), Art History, Sociology, and Anthropology. In addition to his formal training as a linguist and translator, Milo was tutored by the legendary Thaddeus Thatch, his grandfather, in the fields of Cartography, Drafting, Navigation, Astronomy, Archeology, and Antique Restoration Techniques.
** Employed in Washington, D.C. as a Museum Linguist/Translator and Cartographic Restoration Expert, 1903-1904. Participated in Academic Exchange Program 1909-10, spent 11 months working in Paris at the Bibliotech National, and the Prado Museum in Madrid.
** Also, see the HiddenDepths section.
* ButtMonkey: He is the butt of every prank by the rest of the crew and gets no respect for most of the trip.
* ChastityCouple: With Kida. They're clearly in love, but all they do on-screen is {{holding hands}} and hugging.
* CunningLinguist: An "expert at gibberish".
* {{Determinator}}: He's been trying for years to put together the resources for an mission to find Atlantis and validate his grandfather's theories despite everyone in Academia treating him like a kook and sabotaging him. In his own words, "I will find Atlantis on my own, if I have to ''rent'' a ''rowboat''."
* DistractedByTheSexy: Every time he's around Kida. Just look at his reaction when he first lays eyes on her. He forgets his own pain!
* DitzyGenius: Intellectually, he is quite capable and accomplished, being a CunningLinguist amongst other things, but he lacks more common skills, such being able to drive, and he also is quite TheKlutz (and he disturbingly often crosses into LethalKlutz territory to boot) triggering both small and large disasters either by fiddling with stuff he doesn't fully understand or simply by bumbling around.
* GeekPhysique: Kida assumes he is a scholar because with his "diminished physique and large forehead you are suited for nothing else".
* GoingNative: At the end of the film, he decides to stay with the Atlanteans. He goes as far as to even marry Kida.
* HeroicBSOD: After Kashekim dies and all seems lost.
-->'''Sweet:''' I followed you in and I'll follow you out. It's your decision.\\
'''Milo:''' Oh, my decision? Well, I think we've seen how effective ''my'' decisions have been. Let's recap. I lead a band of plundering vandals to the greatest archeological find in recorded history, thus enabling the kidnap and/or ''murder'' of the royal family. Not to mention personally delivering the most powerful force known to man into the hands of a mercenary ''nutcase'' who's probably going to sell it to the Kaiser! Have I left anything out!?
* HiddenDepths: He's an eager but put-upon linguist and cartographer... who also knows an awful lot about plumbing and boilers, right down to how to treat certain brands and models.
* IChooseToStay: He's the only one who stays behind in Atlantis, to help the Atlanteans rediscover their lost culture and stay with Kida.
* KindheartedCatLover: Milo has a white Persian named "Fluffy." At the end of the movie, it's implied that she now belongs to Audrey.
* MayflyDecemberRomance: With [[Really700YearsOld Kida]].
* {{Megane}}: In the {{adorkable}} sense. He wears glasses and is quite cute.
* MightyWhitey: He has none of the characteristics that are usually ''associated'' with the trope, but he fulfills it anyway; since the Atlanteans can't read their own language or use their technology, and he can. An unusual variation in that he actually ''saves'' the native peoples' culture, while most examples of this end up doing the opposite; there's also the fact that he does this by enabling the discovery and retrieval of technology and knowledge that the Atlanteans had themselves already created, and then been deliberately prevented from accessing after the cataclysm that destroyed their continent.
* MrFanservice: Not as explicitly as, for example, [[BareYourMidriff Kida]], and [[NakedPeopleAreFunny his under-dressed moments are often played for laughs]], but he ''does'' spend a lot of time in a thin tank top and cool pants showcasing his GeekPhysique and, at one point, goes swimming with Kida in his underwear, to the delight of many fans.
* NaiveNewcomer: He was only brought on the team because they needed a linguist.
* TheNavigator: Due to being the only one who can translate the Shepherd's Journal, though he does occasionally get it wrong.
* NiceGuy: That and [[{{Adorkable}} his dorky, quirky nature]] are the main reason why he has such a huge, out-of-universe female fanbase.
* OfficialCouple: With Kida. They fall in love during the movie and at the end, Milo stays in Atlantis so he can stay with Kida.
* {{Omniglot}}: Not nearly as much as the Atlanteans, but in addition to his native English, he is also comfortable conversing in Latin and French and can understand and read Atlantean.
* TheOnlyBeliever: At least initially, he's the only member of the team interested at all in scientific advancement, or thinks that the mission is about that. Everyone else is in it for the money.
* OppositesAttract: With Kida. He's an {{Adorkable}} nerd, she's a TomboyPrincess.
* RaisedByGrandparents: After his parents died, his grandfather raised him.
* ScienceHero: Most of his heroics are from his academic knowledge: languages, boilers, ancient technology, etc.
* ScrewTheMoneyIHaveRules: He does not give a damn about all the money that can be made off Atlantis if it means killing the people living there.
* SmartPeopleWearGlasses: Wears circular glasses and is a major BrainyBrunette.
* StrongGirlSmartGuy: With WarriorPrincess Kida. He's the first person to accurately pinpoint the sunken city in centuries, while she's defended the borders of Atlantis for thousands of years.
* TookALevelInBadass: By the end of the film.
* TragicKeepsake: Milo kept his grandfather's explorers hat.

[[folder:Princess / Queen Kidagakash 'Kida' Nedakh]]
[[caption-width-right:350:''"We were once a great people, now we live in ruins. The Kings of our past would ''weep'' if they could see how far we have fallen."'']]

-->''"Solesh mat-o-not, Maylo Thatsh-top. Kwam tered-se-nen." {All will be well, Milo Thatch. Be not afraid.}''
--->'''Voiced by:''' Creator/CreeSummer

The Princess of Atlantis.
* AmbiguouslyBrown: And since Atlantis is cut off from natural sunlight it's probably not a tan.
* BareYourMidriff: Until the end of the film, when she is made queen and wears a robe.
* BewareTheNiceOnes: As nice as she is, Kida isn't afraid ''to kill'' if someone threatens her loved ones or home.
* BrutalHonesty: Is not afraid to say what's on her mind even when it contrasts with her father's beliefs. Also, this gem with Milo.
-->'''Kida:''' ''[to Milo]'' You are a scholar, are you not? Judging by your diminished physique and large forehead you are suited for nothing else!
* ChastityCouple: With Milo. While they are clearly the movie's OfficialCouple, all they do on-screen is {{holding hands}} and hugging.
* TheChiefsDaughter: Her dad is the king.
* CoolCrown: Her tiara at the end of the film.
* CombatPragmatist: She doesn't hesitate to knee men in the groin.
* DarkSkinnedBlonde: Apparently, it's standard for Atlanteans.
* DeadlyUpgrade: The crystal, which preserves the life of Atlantis, will merge with a royal host if it senses danger. Since Rourke is threatening it, it merges with Kida, putting her into a vegetative state that will kill her if she is in it too long, as it did to her mother when Atlantis first sank.
* DoesNotLikeShoes: She's barefoot for the whole movie.
* EmpoweredBadassNormal: When joined with the Heart, Kida has the power to both levitate and telekinetically activate the engravings of the Kings and project bolts of energy into the Stone Sentinels that guard the perimeter of the city. She channels an ungodly amount of power that is enough to both halt and ''freeze'' an erupting pyroclastic flow and lava torrent from a powerful volcano within seconds and then break apart the resulting mantle. It's also quite safe to say that you ''don't'' want to lay a hand on her while she's in this form.
* GiveGeeksAChance: Her dynamic with Milo, obviously.
* GroinAttack: ''Twice'' on the same poor schlub, within the span of ten seconds.
* HealingHands: Another power of the personal crystal necklaces, though Kida shows that its power may be virtually untapped if it can heal all physical ills save eventual old age and death. This ties back to the "advanced medicine" Milo claims the Atlanteans once (and still do) possess.
* TheHighQueen: After she follows in her father's footsteps at the end of the film.
* IllKillYou: To Rourke, after he mortally wounds her father. She succeeds in carrying this out by proxy, providing Milo with the means.
-->''"Moh-it gwenog-lo-nik!" {I will kill you for that!}''
* InSeriesNickname: She goes by the sobriquet of "Kida".
%%* LeParkour
* MacGuffinSuperPerson: [[spoiler:She becomes fused with the crystal and Rourke tries to take her to the surface, which leads to the battle of the climax to bring her back to Atlantis.]]
* MasculineGirlFeminineBoy: She would have been more than a match for Rourke. The younger Thatch is sopping-wet next to her.
* MayflyDecemberRomance: With Milo, who has only lived a very small part of her lifetime.
* MegatonPunch: To Mole after he whispers a rather promiscuous proposition to her in French. Mole weighs over ''300lbs''.
* MissingMom: Kida's mother was exposed to the crystal's power for too long and died as a result. She is briefly seen in the [[ColdOpen intro]].
%%* MsFanservice:
* MysticalWhiteHair: White hair seems to be a racial trait of all Atlanteans, suggestive of their longevity (but not their age—the children have white hair, too).
* NiceGirl: She is kind heart, and has a general respect for all creatures.
* NubileSavage: Even though she's thousands of years old.
* OfficialCouple: With Milo. At the end of the movie, he stays in Atlantis to be with her and they become the new rulers of the kingdom.
* OlderThanTheyLook: Like all Atlanteans, she ages at a fraction of the rate of a normal human, having been present for the sinking of Atlantis over 8000 years ago.
* {{Omniglot}}: Because according to Milo, ''all'' modern languages in the Northern and Southern Hemispheres descend from Atlantean, so she can speak English perfectly, as well as Greek, Latin, French, Mandarin, Hebrew, Japanese, Norse and of course; Atlantean.
* OppositesAttract: With Milo. She's a TomboyPrincess, he's an {{Adorkable}} nerd.
* PowerGlows: When she merges, she's drawn entirely with white lines and luminous blue-white surfaces for a very eerie "supercharged" effect.
* ProudWarriorRaceGirl: She's shown to be this before and after she meets Milo. Her father even admitted 1000 years prior to the story Kira would have slain any trespasser in Atlantean territory on sight and without remorse, having only not done so to Milo and his crew because she was desperate for a way to save her dwindling civilization.
* ReallySevenHundredYearsOld: She's anywhere from 8,500 to 8,800 years old when we accept that she was ''a child'' at the time of the great flood.
-->'''Milo''': Oh, well. Hey. Looking good!
%%* RoyalsWhoActuallyDoSomething
* SecondLove: Bonus material points out that she is this to Milo, surprisingly.
* ShesGotLegs: She wears a high-cut bikini bottom for most of the movie.
* SingleWomanSeeksGoodMan: Kida falls in love with the intelligent, endearing, kind-hearted Milo Thatch.
* SomeCallMeTim: Since her full name is hard to pronounce, she likes to be called simply "Kida".
* SpockSpeak: Her English speech is very sophisticated and lacks contractions.
* StrongFamilyResemblance: Kida looks ''exactly'' like her deceased mother.
* StrongGirlSmartGuy: With the linguist/explorer Milo. She's defended the borders of Atlantis for thousands of years, while he's the first person to accurately pinpoint the sunken city in centuries.
* SuperNotDrowningSkills: She can't ''breathe'' underwater, but is still an amazing diver. Justified considering she's been practicing in a half-sunken city for a ''long'' time.
%%* TomboyPrincess
* TookALevelInKindness: Off-screen, but she was much less welcoming in the past due to her role as a protector of Atlantis from those who who would try to exploit it. The fact that Atlantis is slowly decaying and dying is what gets Kida to let Milo and his group in.
-->'''King Kashekim:''' Your heart has softened, Kida. A thousand years ago, you would have slain them on sight.
* TragicKeepsake: In a very brief moment near the beginning of the film, Kida's bracelet is pulled off by her mother as she's called into the Heart of Atlantis. When Kida herself returns from the crystal's possession near the end, she has the bracelet with her.
* TheUnpronounceable: Milo can't get his tongue around her full name, and he's a linguist.
* VoiceOfTheLegion: When under the possession of the Mother Crystal.
* WalkOnWater: The first sign that the Atlantean crystal is investing her with powers.
* WarriorPrincess: It is implied that she has been patrolling Atlantean boarders with a team of fellow warriors and killed anyone that came too close, and that this is one of her duties as Atlantis' princess.
* YouGottaHaveBlueHair: Kida has natural white hair, like the other Atlanteans.

[[folder:Commander Lyle Tiberius Rourke]]
[[caption-width-right:350:''"But we are peaceful explorers, men of science."]]''

-->''"I love it when I win."''
--->'''Voiced by:''' [[Film/TheGreatEscape James]] [[Series/{{Maverick}} Garner]]

The leader of the band of mercenaries, for the Atlantean expedition.
* AssholeVictim: Absolutely ''none'' of the crew(or audience) feel bad when he winds up a pile of molten rock.
* AxCrazy: Downplayed until the climax, where he goes into a VillainousBreakdown.
* AnAxeToGrind: He grabs a nearby fire axe during his fight with Milo.
* BigBad: He is the leader of a group of mercenaries that are after the crystal.
* BloodKnight: He attacks Milo with a fire axe fully intending to chop him to pieces.
-->"Getting ''tired'' Mr. Thatch? Aw, that's a darn shame. Cause' I'm just getting warmed up!"
* BodyHorror: What happens to him after his arm is sliced with a piece of glass charged with crystal energy.
* ClippedWingAngel: Unlike most Disney villains, turning into a monster does ''not'' make him more powerful--as he claws his way after Milo, it's implied that moving causes him pain.
%%* ColonelBadass:
* CrazyPrepared: According to Audrey, Rourke is "never surprised" and "carries a lot of guns." Both of which are understatements.
* EvilAllAlong: Starts off seeming like a tough-but-fair leader, but it turns out that he was after the crystal from the very beginning.
* EvilCannotComprehendGood: He shows complete confusion and frustration when his crew abandons him for condemning Atlantis to death out of greed, and when they explain that they didn't want anyone hurt in their tomb-robbing, he remarks, "P. T. Barnum was right" ("There's a sucker born every minute.").
-->'''Rourke:''' Aw, you can't be serious.
-->'''Audrey:''' This is wrong and you know it!
-->'''Rourke:''' We're this close to our biggest payday ever and you pick now of all times to grow a conscience?!
-->'''Vinny:''' We've done a lot of things we're not proud of; robbing graves, eh, plundering tombs, [[ArsonMurderAndJayWalking double-parking...]] BUT, nobody got hurt! Well... maybe somebody got hurt but, nobody we knew.
-->'''Rourke:''' [[LackOfEmpathy Well if that's the way you want it, fine. MORE FOR ME! P. T. Barnum was right.]]
* EvilHasABadSenseOfHumor: When he reveals his true colors, he makes more wisecracks than one might expect from a naval officer. Instead of making him AffablyEvil however, it makes him more despicable, for instance when Dr Sweet protests after Rourke [[MoralEventHorizon fatally punches the King]], the villain quips back:
--> "I suggest you put a bandage on that bleeding heart of yours, it doesn't suit a mercenary."
* EvilIsPetty: You can't get anymore petty than condemning an entire civilization to death just for triple the amount of money. Or bullying Milo and the King.
* FamilyUnfriendlyDeath: After being, [[BodyHorror painfully,]] transmogrified into a crystal monstrosity when Milo slashed his forearm with a piece of irradiated glass from the Kida's containment tank window, he is literally shattered into tiny bitty pieces by the whirling helicopter blades.
* FantasticallyIndifferent: Shows remarkable ability to just roll with things.
--> '''Milo''': Okay, there's a giant crystal hovering 150 feet above our heads over a bottomless pit of water. Doesn't anything surprise you?
* FauxAffablyEvil: Even when he throws [[TheDragon Helga]] off the platform, he calls out cheerfully, ''"{{Nothing personal}}!"'' after her!
** Notably, as they get closer to Atlantis, his demeanour becomes less "military commander" and more like a jovial uncle, always cracking jokes even when he's threatening Milo or the King.
* FlatCharacter: He is evil because he wants more money. No particular reason why, especially considering he would profit significantly from discovering Atlantis. Despite pretending to be a reasonable authority figure, he turns out to be nothing more than a stock human antagonist to act as an obstacle for the hero.
* {{Foreshadowing}}: His true colors were hinted at before TheReveal when Helga commented to him that there being people alive in Atlantis 'changes everything', to which he replies "This changes ''nothing''".
* GasMaskMooks: His henchmen wear gas masks despite a lack of gas anywhere.
* GemTissue: Appears to have become this towards the end of the film, [[spoiler:since he was shattered]].
* {{Greed}}: Of all the Disney Villains that had greed as a motivation, it is egregiously exaggerated. [[FridgeLogic Who in the times of WWI would even be able to afford paying triple the profit that Rourke is desiring?]]
* HateSink: Once he's revealed to be the villain, Rourke goes out of his way to become as unlikable and despicable as possible, [[EvilIsPetty with the flimsiest of excuses]], [[StupidEvil even when its not wise to do so]], and has the most transparent of motives, all while acting like an [[SmugSnake insufferable jackass who thinks he knows better]]. His bad sense of humor is tasteless, he is completely unreasonable, and his actions and attitude are so repulsive that most of the cast immediately turn on him. And he didn't hesitate to throw Helga off the blimp in order to lighten its load.
* HiddenVillain: The fact that he is the film's main antagonist is not immediately obvious.
* HoistByHisOwnPetard: Tossing Helga off the gyro-balloon to lighten the load was what really messes up his plans.
* {{Jerkass}}: One of the biggest assholes ever put into a Disney Film. Its not hard to see why every named character turns on him and betrays him.
* KarmicDeath: Willing to wipe out an innocent civilization just to profit off of their power crystal, while acting like they're just a relic from the past. Gets transformed into a mass of crystal himself and obliterated completely, leaving nothing to bury.
* LightningBruiser: He outweighs Milo by a hundred pounds, easily, and he's faster. It's a CurbStompBattle.
* LiterallyShatteredLives: His eventual fate is to be shredded to crystal dust by a propeller.
* InsistentTerminology: "Mercenary? I prefer the term ''adventure capitalist''."
* OnlyInItForTheMoney: To the point where he tries to steal the crystal to get even more money.
* PainfulTransformation: Rourke is clearly screaming in pain when the crystal energy overwhelms him.
* PlotBasedPhotographObfuscation: Early on, Milo notices that there's a page missing from the Sherpherd's Journal. Later on, it turns out that the missing page describes the properties of the legendary crystal in detail. Rourke's the one who ripped it out.
** When Whitmore is showing Milo the crew files, Rourke's is the only one obscured.
%%* PunchCatch: On poor, brave Milo.
* SlasherSmile: Sports one in the climax when the VillainousBreakdown comes into play.
* SmugSnake: Despite never being surprised, and responding to the unexpected situations effectively, to say he was overconfident would be an understatement, and [[KickTheDog every action he took]], underestimating Milo, tossing Helga off the blimp, and just acting like a cruel dick to everyone when his true colors were revealed, ''really'' [[HoistByHisOwnPetard bit him in the ass]]. Killing off the people of Atlantis just to get slightly richer comes off as [[EvilIsPetty exceptionally petty]], as just discovering Atlantis would've been rewarding enough.
* TheSociopath: He seems like a rather grandfatherly if somewhat tough man, who holds a funeral for the men and women who were killed during the Leviathan attack. When he's revealed to be a mercenary however, he demonstrates a LackOfEmpathy for the Atlanteans, proudly claiming that he would triple the price for the Crystal knowing that it's their life force, keeps up his [[FauxAffablyEvil jovial facade]] even after fatally wounding the King and demonstrates how much he really cares about his crew when he leaves the main characters to die with Atlantis and double crosses Helga without hesitation.
* {{Soft Spoken Sadist}}: Even during his VillainousBreakdown, he's jovial and doesn't raise his voice.
* StupidEvil: Being part of the team which discovered friggin' ''Atlantis'' would already have made him rich and famous beyond his wildest dreams. [[{{Greed}} Too bad Rourke wants more]], [[ItsAllAboutMe even at the expense of quite literally everyone one else]], [[YouHaveOutlivedYourUsefulness from his own team]] [[OmnicidalManiac right down to the Atlantians themselves.]]
* TalkToTheFist: Milo tries convincing him to back down from his plan to rob the Atlantians. Rourke ultimately replies by punching him in the face.
%%%* TurbineBlender: What kills him.
* VillainousBreakdown: As Milo proceeds to ruin his attempt to air-lift Kida to the surface, Rourke starts trying to cut him to ribbons with a fire axe.
-->"I consider myself an even-tempered man; it takes a heck of a lot to get under my skin. But congratulations--you just won the solid gold Kewpie doll!"
* VillainHasAPoint: The rest of the expedition sans [[TokenGoodTeammate Milo]] were perfectly okay with robbing the Atlanteans of their treasure at gunpoint [[EvenEvilHasStandards up until the point Rourke actually started killing people.]] But they never ''once'' thought that might end in violence?
* WalkingSpoiler: He's built up as the team's more grounded leader in both the marketing and the first half or so of the film. It's only in the last 20 minutes that it comes to light how utterly amoral he is, at which point he becomes the main antagonist.
* ZeppelinsFromAnotherWorld: A justified use, since the movie takes place at the pinnacle of the zeppelin period. The general design is actually taken from high-altitude meteorological balloons of the period.

[[folder:Lieutenant Helga Katrina Sinclair]]
[[caption-width-right:350:''"You promised me a percentage!"'']]

-->''"Well, I came down the chimney. Ho, ho, ho."''
--->'''Voiced by:''' [[Series/BabylonFive Claudia Christian]]

Rourke's German second-in-command.
* BadassLongcoat: Briefly wears one.
%%* BeautyMark
* ContraltoOfDanger: Has the lowest voice of all the female characters and is the evilest of them all, too.
* DarkActionGirl: Eviler than the other named female characters.
* DisneyVillainDeath: Subverted. It wasn't the fall that killed her (although it quite possibly broke her back and/or caused quite a bit of internal bleeding), but having a flaming gantry crash down on top of you would certainly do the trick. And if THAT didn't do it, the ground erupted into a lava flow that inundated the cave.
* DeadpanSnarker: She has her moments.
* TheDogBitesBack: It's Helga's [[LastBreathBullet igniting the hydrogen]] after Rourke betrays her that really foils the EvilPlan.
* TheDragon: To Rourke, until her last moments.
* FemmeFatale: Don't let her hotness fool you, she is a ruthless mercenary.
* FlareGun: Has one tucked away. She uses it on Rourke's escape balloon in the climax. Also counts as a ChekhovsGun. We see the gun early on when she shoots it to see how deep they're dropped into the volcano, then it plays an important role in the climax.
* HartmanHips: She is strong, athletic and very well-endowed in the thighs and glutes department.
* HeelFaceDoorSlam: Helga shows some remorse when she discovers that they will be stealing from living people and not a long-dead civilization, but she is betrayed and mortally wounded by Rourke before she (possibly) switches sides.
* KickChick: Made particularly obvious in her final fight with Rourke. Unfortunately for her, Rourke demonstrates the weakness of this fighting style, grabbing her foot and using it to toss her off the balloon.
* LastBreathBullet: Well flare actually, but it still fits.
* NothingPersonal: "Nothing - ''Personal''." Her FamousLastWords, doubling as an IronicEcho.
* PerpetualFrowner: She's almost always scowling.
* RightHandCat: The standard white Persian, although it's actually Milo's.
* RedemptionEqualsDeath: Saves her last moments by firing a flare to prevent Rourke from escaping.
* {{Sexophone}}: Heard when she makes her debut in Milo's apartment.
* TankTopTomboy: Wears one near the finale, despite the fact that they hadn't even been created during the time the story takes place.
* TakingYouWithMe: Obviously badly injured, she fires a flare into the balloon that her murderer is using to escape.
* ThrownFromTheZeppelin: She is literally thrown off one in the climax.
* WaifFu: Tries to use this gymnastic, kick-heavy style on Rourke. She gets thrown off ''again'' despite her efforts.

[[folder:Vincenzo 'Vinny' Santorini]]
[[caption-width-right:350:''"It was like a sign from God. I found myself in that boom."'']]

-->''"With something like that, I would have, white wine, I think."'' '''- Vinny, on the Leviathan'''
--->'''Voiced by:''' Don Novello

An Italian demolitions expert.
* ArsonMurderAndJaywalking: "We done a lot of things we're not proud of. Robbing graves, plundering tombs, double parking..."
%%%* DeadpanSnarker:
* DemolitionsExpert: To say that he's obsessed with explosives is an understatement.
* EvenEvilHasStandards: A self-admitted example in that he doesn't care if he hurts people ''unknowingly'' but won't stand for it when it's rubbed in his face.
* HeelFaceTurn: Along with the rest of the group when Milo calls them out.
* HeroicComedicSociopath: Has some of the most violent lines in the movie. They're also some of the funniest.
* MeaningfulName: His last name comes from the island of Santorini in the Greek islands, home to a volcanic eruption thousands of years ago that is thought to be part of the inspiration for the legend of Atlantis.
* NoodleIncident: Whitmore offhandedly claims to have freed him from a Turkish prison.
* OnlyInItForTheMoney: Averted by the end. But he's rewarded handsomely anyway!
* TheStoic: Most of the time, he has a very bored expression on his face. He only really smiles twice in the movie: after blowing up the pillar to make a bridge, and when he discovers the explosive capabilities of the Atlantean Aktirak's {{Wave Motion Gun}}s.
* StuffBlowingUp: Vinny loves explosions, but not enough to be a BombThrowingAnarchist.
* {{Troll}}:
-->'''Vinny:''' You didn't just drink that, did you?
-->'''Milo:''' ''(Nods happily)''
-->'''Vinny:''' That's ''not good'', that's nitroglycerin! Don't move, don't breathe, don't do ''anything.'' Except, uh...pray, maybe.

[[folder:Audrey Rocio Ramirez]]
[[caption-width-right:350:''"Two for flinching."'']]

-->'''Whitmore:''' ''"Don't let her age fool you. She's forgotten more about engines than you and I will ever know."''
--->'''Voiced by:''' [[Film/SixDaysSevenNights Jacqueline Obradors]]

A teenage female Puerto Rican mechanic and the youngest member of the expedition.
* TheBabyOfTheBunch: As stated above, Audrey is the youngest member.
* BrainyBrunette: Of the engineering variety.
* TheBully: Claims that she used to take lunch money from guys like Milo. Perhaps it's true?
* ChewBubblegum: Though she doesn't utter the immortal line. The very act of her blowing and bursting the bubble during Milo's presentation to the rest of the group seems to unnerve him even more than he already is.
* ChildProdigy: Began working in her father's Automobile Repair Shop as a mechanic's assistant in 1901 at age 5. Showed an early aptitude for mechanical engines; was promoted to full apprentice at age 7. Began work at Henry Ford Automotive 1905 at age 9 as Journeyman Mechanic. Was given first supervisory position at age 11.
* DaddysGirl: Strongly implied; she wants to earn enough money from the expedition to open another shop for her father's business.
%%* DeadpanSnarker:
* DefrostingIceQueen: She's rather abrasive to [[NaiveNewcomer Milo]] at first, but once she warms up, she's quite a softie.
* KindheartedCatLover: If the fact that she took in Milo's cat after he stayed in Atlantis is any indication, then yes.
* NiceGirl: The first to take notice of Milo's [[WhatTheHellHero admonishments]] and the first to fully support him after Rourke beats him down.
* NiceHat: One that manages, against all odds, to stay on her head for nearly the entire film, until she swaps it for a different hat to go with her formal dress while meeting with Whitmore at the end.
* ThePiratesWhoDontDoAnything: Amusingly, she is never actually seen repairing anything mechanical ''on-screen'' (the most technical work she is shown doing is turning a valve and tightening a nut, tasks anyone with with a pair of functioning hands and a wrench can accomplish, and the one time her set of skills is directly needed, Milo ends up doing the job instead) meaning that her status as a great mechanic ends up being somewhat of an InformedAbility.
* TeenGenius: The youngest member of the team, and an ace mechanic.
* {{Tomboy}}: She reveals in her backstory that her father wanted boys.
* WrenchWench: She's the one in charge of repairs and maintenance.
* WrongSideAllAlong: The audience gets to see foreshadowing of Rourke's greed and lack of respect. But the crew, Audrey in particular, seem horrified when Rourke starts kidnapping women, punching old men and being a-okay with condemning hundreds if not thousands of people to ''death'' for his own personal profit.
-->''"This is wrong and you know it!"''

[[folder:Wilhelmina Bertha Packard]]
[[caption-width-right:350:''"Wow. I'm Impressed."'']]

-->''"He took his suitcase? Marge, honey. I don't think he's coming back."''
--->'''Voiced by:''' Florence Stanley

An elderly, sarcastic, chain-smoking radio operator.
* BrutalHonesty:
-->"We're all gonna die."
* BeenThereShapedHistory: She's the "Packard" in "Packard-Bell", according to WordOfGod.
** Oh boy: [[labelnote:If you want to know all the backstory details]]She worked as a research assistant and reputed mistress of Dr. Mahlon Loomis from July to November of 1875. Developed the Galvanometer, and with the help of Dr. Loomis, the concept of Hertzian Wave Application. Worked as research assistant and eventually as a full partner to Dr. Nathan Stubblefield, developing the vibrating telephone in 1888. Married Dr. Stubblefield, 1891. Secured Congressional Appropriation of $50,000 for further development of work. Appropriation was never forthcoming, for reasons known only to Congress. Divorced Dr. Stubblefield, 1893. Traveled and worked with Guglielmo Marconi, 1898-1901. Instrumental in December Trans-Atlanic broadcast. Worked as research fellow for Victor Talking Machine, 1902-04. Developed Sodion Non-Regenerative Detector, 1902. Developed Bornite Movable Cup Perkion Detector, 1903. Worked for Atwater-Kent 1904-1907. Helped develop Radak Type R-4 Regenerative Circuit and holds sole patent for the Orthosonic Circuit. Worked for Magnavox 1907-1912. Developed AC-3-C Battery.[[/labelnote]]
* CuriousQualmsOfConscience: The last of the group's specialists to take Milo's side. For no other reason than perhaps... ''Meh''.
* DeadpanSnarker: Every other sentence that comes out of her mouth drips with snark. She's particularly sardonic when making announcements over the ''Ulysses'' tannoy.
* DissonantSerenity: ''(Gargantuan Leviathan Machine of War fires beam of energy through the Ulysses, crippling it and dousing the boilers with sea water.)''
-->'''Audrey:''' ''(Trying to hold it together)'' Get me the bridge!
-->'''Mrs. Packard:''' ''(Opens 'Crime' magazine)'' Sir, it's engineering on four.
* DitzyGenius: She seems to be barely fazed by all the craziness happening around her, but despite this supposed senility, she does her job with a calm that can provide stability in trying times.
* DudeMagnet: She manages to get some ''very young'' Atlantean men to fight over her. And has been previously married to ''eleven'' husbands.
* DullSurprise: She doesn't surprise easily. Heck, it takes colossal statue guardians coming to life to impress her!
* EveryoneHasStandards: The most apathetic and indifferent member of the supporting cast. Although, like the others (except the villains, of course), she draws the line at destroying an entire civilization to get more money.
* FanDisservice; Although we mercifully don't get to see if this is the truth. She apparently sleeps in the nude -- and she sleep-walks.
* FantasticallyIndifferent: Where ''a lot'' of the humour around her character stems from. No matter how intense the danger. She spends the finale ''taking photographs''.
* KavorkaMan: Gender-flipped. Despite being an elderly woman, she still manages to get young Atlantean men to ''fight over her''.
* UnfazedEveryman: A prehistoric war machine has mortally crippled the sub and in five minutes the boiler is going to kill anybody left aboard!
--> '''Packard''' ''(into the radio):'' I gotta go Margie. No, no, I'll call you.
* WhoWritesThisCrap: When she's doing public announcements aboard the ''Ulysses.''
--> '''Packard''' ''(reading from script):'' 'Dinner tonight will be baked beans. Musical program to follow...' Who wrote this?

[[folder:Doctor Joshua Strongbear Sweet]]
[[caption-width-right:350:''"Here. I'm gonna need you to fill these up."'']]

-->''"I got a sheepskin from Howard U, and a bearskin from old Iron Cloud. Halfway through medical school I was drafted, one day I'm studying gross anatomy in the classroom, the next, I'm sawing up Rough Riders on San Juan Hill."''
--->'''Voiced by:''' Phil Morris

A medic of African American and Native American descent.
* BizarreTasteInFood: Implied, as he wasn't hesitant at all about trying the alien cuisine of Atlantis. Justified, being a combat medic meant that he had to get the most out of every meal, especially since he was on the front lines and had to keep everyone healthy.
-->'''Sweet:''' Don't forget to eat the head! That's where all the nutrients are ''[proceeds to slurp the crustacean's head and all of its innards in one sitting]''
* ChekhovsGun: His saw, which he draws attention to at the beginning of the film and which he and Audrey later use to try and free the crystallized Kida. Maybe if ''he'd'' done the sawing instead, the plan might have worked.
* DareToBeBadass: Even this is delivered to Milo as a touching reminder instead of a harsh rebuke.
-->'''Sweet:''' Of course, it's been my experience, when you hit bottom, the only place left to go is up.
-->'''Milo:''' ''(Dismissive)'' Huh. Who told you that?
-->'''Sweet:''' A fella by the name of Thaddeus Thatch.
* GentleGiant: A refreshing aversion from the ScaryBlackMan trope, he is a large and broad shouldered black man who is as kind as his name implies (i.e. very).
* HypocriticalHumor: Claims to hate fish yet tucks into the Atlantean meal (consisting mostly of crustaceans) Kida serves to the group with particular zeal. Then again, he'd been on a lengthy journey with [[LethalChef Cookie]] handling all the food, [[FridgeBrilliance so he probably got over the fact that it was seafood.]]
* LastNameBasis: He is often just called Sweet.
* MeaningfulName: He is one of the friendliest and most decent members of the group, and the first to HeelFaceTurn (after Rourke gut punches Kida's father).
* MotorMouth: Particularly brought to attention during his initial checkup on Milo, where he keeps talking despite Milo having a thermometer in his mouth.
* NamesToTrustImmediately: If your doctor's name was "Sweet" wouldn't that put you at ease?
* NiceGuy: Mentioned by Milo when he's attempting to teach Kida the names of his teammates. Milo has some trouble making a distinction for her between the names "Sweet" and "Cookie" and that cookies are sweet and that Sweet is a nice person.
* TeamDad: He is the wisest and most compassionate member of the group.
* TwoferTokenMinority: He's African-American and Native American.

[[folder:Jebediah Allardyce 'Cookie' Farnsworth]]
[[caption-width-right:350:''"Saddle up, partners. Bring jerky and ammo!"'']]

-->''"Sweet mother of Jefferson Davis!"''
--->'''Voiced by:''' Jim Varney

A Western-style chuckwagon chef.
* AmericansAreCowboys: Unsurprising, since he was a quartermaster, mule-skinner, rifle-man, scout and fur-trapper in the US Army during the Civil War and the subsequent Sioux Wars.
* CampCook: Unfortunately, he is also a LethalChef.
--> I got your four food groups: Beans, bacon, whiskey, and lard!
* ColdSniper: With a double-barreled musket, of all things. Though considering that he's on the side of the good guys in the climax, he's more of a FriendlySniper.
* DisproportionateRetribution: When working as a restauranteur in New York, a customer complained about his culinary skills. Cookie was subsequently fired for ''shooting him in the knee''.
* TheDitz:
-->"I seen this in the Dakotas! They can smell fear just by looking at ya. So keep quiet."
* InformedAbility: Like most of the rest of the cast, Cookie was ostensibly selected for the expedition because of his expertise in a particular skill--in his case cooking. However, everything we see of his food suggests that it is neither appealing (see LethalChef below) nor nutritious (he thinks that the four basic food groups are bacon, beans, whiskey and lard). So how he got on this crew is anyone's guess.
* LethalChef: His cooking, when thrown on the campfire, [[EverythingMakesAMushroom makes a mushroom cloud]] at one point. Not surprising, considering the grease content. He's also ''horrified'' when presented with an ordinary head of lettuce.
* NiceHat: A bowler hat with a red feather.
* OnlyKnownByTheirNickname: Only known by his nickname "Cookie".

[[folder:Gaetan Moliere AKA: 'Mole']]
[[caption-width-right:350:''"You have disturbed the dirt!"'']]

-->'''Kida:''' ''"The little digging animal called Mole... He is your pet?"''
--->'''Voiced by:''' Creator/CoreyBurton

A French geologist who acts like a mole.
* AnimalMotifs: Moles, obviously, due to his PunnyName, obsession with dirt, and even physical resemblance to one. He even carries a plush mole that he presumably sleeps with.
* BigEater: One of the few who tucks into Cookie's meals with ''gusto.'' He also takes a bite out of the Atlantean crustaceans quite happily.
* BizarreTasteInFood: He quickly enjoys the Atlantean food with no problem whatsoever.
* BunnyEarsLawyer: Even by the standards of the RagtagBunchOfMisfits he's a part of, Mole stands out as an utter wackadoo - however, he is ''brilliant'' when it comes to Geology, dirt in particular, and [[AllThereInTheManual has developed or invented 62 independent mining and excavation vehicles, tools, or related equipment.]]
* DirtyOldMan: Quickly gets far too familiar with Kida, which leads to him getting punched. And, yes, he is very, physically dirty.
* FatBastard: Downplayed, in that he's a mild FrenchJerk with questionable social skills.
* TheFriendNobodyLikes: Everybody in the group is disgusted by him, and it says quite a lot that in a group that includes Cookie, Vinnie and Mrs. Packard that ''he'' is considered the biggest freak around.
* GeniusDitz: He seems to be "out there" on everything other than geology, his specialty.
* GeniusSlob: The Mole, dirt is his job and his hobby. Brilliant geologist. Sleeps in a hole he digs out for himself.
* {{Gonk}}: He is a lot uglier and more disproportionately built than the other characters, along with those rather weird telescope-glasses.
* HeCleansUpNicely: As the end of the film shows, he really doesn't look all that bad when he's properly cleaned and formally dressed. He's clearly uncomfortable with it, though, and buries himself in a large flowerpot at the first opportunity.
* JabbaTableManners: While having lunch with the Atlanteans, Sweet shows him how to eat the crustaceans they use as food, by biting off their heads first. Mole does it in a rather messy way and burps loudly, grossing out Sweet.
* ManChild: [[ThePigPen Pig Pen]] tendencies aside, he's meant to be 39 at this point, but is the most immature of the crew, such as when they decide to cut Milo some slack, he just has to put a wet whoopie cushion on his seat.
* MotorMouth: When analyzing a dirt sample, he talks very rapidly and very quietly to himself.
* NiceHat: His is a leather cap with a variety of minute clockwork tools, telescopic / microscopic binocular lenses and a mini torch lamp.
* ThePigPen: To the degree where ''soap'' is a CoolAndUnusualPunishment.
* OnlyKnownByTheirNickname: It's "mole".
* PunnyName: What do you expect, considering that he's an expert on digging and seems the most comfortable when burying himself in dirt?
* SherlockScan: He ascertains all of Milo's profession and home life merely by examining the dirt under one of his fingernails.
-->"Aha! There you are. Now tell me your story my little friend... [[AwesomeByAnalysis Parchment fiber from the Nile delta circa 500 B.C. Lead pencil, number two. Paint flecks of a type used in government buildings. You have a cat, short-haired Persian, two years old, third in a litter of seven.]] These are all the microscopic fingerprints of the mapmaker. ''(Tastes dirt)'' And - ''linguist.''"
* TeamPet: Kida ''thinks'' he is this for the exploration team. Milo says she is "close enough".
* YouDoNOTWantToKnow: His {{backstory}}, according to Dr. Sweet, is this. It's even the page quote!

[[folder:King Kashekim Nedakh]]
[[caption-width-right:350:''"I know what you seek and you will not find it here. Your journey has been in vain."'']]

-->''"What they have to teach us we have already learned."''
--->'''Voiced by:''' Creator/LeonardNimoy

The King of Atlantis and Kida's father.
* TheAtoner: His attempts to harness the Crystal's power for war were what led to Atlantis sinking, so he isolates the city from visitors and hides the crystal underground.
* BadassBoast: Understated, but still awesome in that it foreshadows Rourke's demise by the crystal.
-->"Some obstacles cannot be removed by a mere show of force."
%%* BadassBaritone
%%* BadassBeard
* BlindSeer: Metaphorical, after the great flood robs him of his vision by him staring into the Heart as his wife ascends and he shields Kida from the sight. His eyes are opened to the magnitude of his mistakes.
* CharacterDeath: Dies of internal bleeding brought on by a punch to the gut from Rourke.
* CoolOldGuy: He is voiced by Spock after all.
* GrumpyOldMan: But is also a bit of this too. Though not without good reason.
%%* MrExposition
* MyGreatestFailure: He used the Atlantean's Crystal power as weapons of war, which caused the great flood in HoistByHisOwnPetard.
%%* ProphetEyes
* SecretLegacy: Considers himself personally responsible for nearly destroying the Atlantean Empire. Because he weaponized the Heart Crystal to power massive engines of war and conquest and even developed a thermo-nuclear weapon / meson bomb of such might that it ''caused'' the tsunami that sank the city.
* SpockSpeak: Like his fellow Atlanteans, his english is very sophisticated and avoids contractions. Bonus points for being voiced by Spock himself.
* TimeAbyss: At least 27,000 years old, considering that for every 300 years that passes, an Atlantean of royal lineage ages just ''one''. So physically, he's anywhere from being in his 90's but considering his age during the Mebel-mok, (30's-40's), he's probably closer to ''40,000 years old'' and one hundred and thirty-ish physically; accounting for his frailty.
* VictoryThroughIntimidation: By his sheer presence alone, he manages to get Rourke to back down from attempting to explore the city for the Heart Of Atlantis and agree to leave by morning. Unfortunately, it only worked while Rourke was still pretending to be nothing more than a peaceful explorer.

[[folder:Preston B. Whitmore]]
[[caption-width-right:350:''"If I could bring back just one shred of proof, that'd be enough for me."'']]

-->''"Your grandad had a saying. 'Our lives are remembered by the gifts we leave our children.' This journal is his gift to you, Milo. Atlantis is waiting."''
--->'''Voiced by:''' John Mahoney

An eccentric millionaire who funds the expedition to Atlantis and an old friend of Milo's grandfather.
* CollectorOfTheStrange: His house is filled with a variety of artifacts from around the world, ranging from totems to weapons (including the Spear of Destiny according to the sequel). He even has a tank filled with [[https://en.wikipedia.org/wiki/Coelacanth Coelacanth]], fish that were thought to be extinct until ''twenty four years'' after the events of the movie.
%%* CoolOldGuy
* CrazyPrepared: Puts together all the equipment and convoy needed for the journey. Including a gyro-evac balloon, bi-planes, digger, trucks, sub-pods, submersible carriers and the SS Ulysses itself. And he even takes care of all of Milo's prior living details before he even accepts the (admittedly awesome) deal.
%%* EccentricMillionaire
* HonestCorporateExecutive: A tremendously successful businessman who is very proud of the fact that he's going to the afterlife with a clear conscience.
* LotusPosition: While performing some ridiculously flexible yoga exercises. He even shakes Milo's hand with his foot.
* NiceGuy: If every rich and powerful person in the world were like this guy, the world would be a ''much'' better place.
* ThePromise: Wishes to fulfill his life-long friend's desire to discover Atlantis posthumously by supporting Thaddeus's grandson in every way he possibly can.
* PursuingParentalPerils: Encourages Milo to follow in his guardian's footsteps and discover the unknown.
%%* ReasonableAuthorityFigure
* SecretTestOfCharacter: When he gives Milo the Shepard's Journal, he's at first very dismissive of the possibility of finding Atlantis and points out how Milo won't get any support. When Milo shows his conviction, Mr. Whitmore smirks and presents the full deal.
* TheSkeptic: Has shades of this, but gives Thaddeus and his grandson in turn every resource required to find the proof they need to uncover Atlantis. By the end, he is thrilled to see that they were right all along.
* TheTeamBenefactor: There'd be no expedition without him. And the SteamPunk tech employed by the team is of his company's creation.
* UnclePennyBags: As rich as Scrooge [=McDuck=] and definitely not afraid to use his vast wealth for seemingly insane purposes. Having funded more than one trip to recover lost artifacts, including the Shepherd's Journal itself.
* WallOfWeapons: Of the antique, collector variety.