!!Arthur Dent
[[caption-width-right:169: "I seem to be having tremendous difficulty with my lifestyle."]]
-> Played in the radio and TV series by Simon Jones; in the film by Creator/MartinFreeman

* AchievementsInIgnorance: In ''Life, the Universe, and Everything,'' Arthur stumbles across the technique for unassisted flight (which turns out to be principally psychological).
* ActionSurvivor: Has survived many crazy science fiction adventures.
* AntiHero: In the befuddled sense.
* BadassLongRobe: His PajamaCladHero getup does include a long dressing gown.
* ButtMonkey: Nothing ever goes his way.
* CatchPhrase:
-->'''Arthur''': So this is it. We're all going to die.
** And some variation of: "Where's the tea?"
* TheComicallySerious
--> "Now, I am the first to appreciate a joke," said Arthur and then had to wait for the others to stop laughing.
* DeadpanSnarker: Clearest and strongest in the original radio drama, where his sarcasm actually makes him famous among the bird people of Brontitall. In other versions this side of him is usually downplayed quite a bit, but he still occasionally gets in a few sarcasms.
-->'''Ford''': How would you react if I said I'm not from Guildford after all, but from a small planet somewhere in the vicinity of Betelgeuse?\\
'''Arthur''': I don't know. Why, do you think it's the sort of thing you're likely to say?
* EarnYourHappyEnding: He was due the huge break life gave him in ''Literature/SoLongAndThanksForAllTheFish''. Too bad it didn't stick. (Though it does in the radio version.)
* FantasticRacism: Ford, Trillian, and Marvin are the only ones who don't call him "Earthman" or "Monkeyman". [[CosmicPlaything Why they call Trillian by her name and not him is just another one of the universe's cruel tricks.]]
* GenreSavvy: Arthur always suspects the worst will happen, fitting considering he's a character in a [[SlidingScaleOfIdealismVersusCynicism very cynical]] series.
* HeroicNeutral: Arthur shares this with most of the characters, which is one of the reasons Adams found the books so difficult to write: all Arthur really wants out of life is a nice cup of tea and maybe his planet back, so he has to be forced to have adventures. Arthur in the film is a bit more impetuous and hot-blooded than the diffident Arthur of the book/radio/TV.
* HeterosexualLifePartners: With Ford. Even if they don't always act like the best of friends, Arthur is very happy to see Ford at the beginning of {{Literature/Life the Universe and Everything}}.
* HowDoIShootWeb: When he learns to fly in ''Literature/LifeTheUniverseAndEverything''.
* {{Iconic Item}}: His dressing gown and his towel.
* LastOfHisKind: Apart from Trillian, anyway. Subverted when the Earth reappears in ''Literature/SoLongAndThanksForAllTheFish'' and later with Random, though this fact is important to her origin.
* LimitedWardrobe: He's stuck in his pyjamas and dressing gown until ''Literature/SoLongAndThanksForAllTheFish''.
* NoRespectGuy: He saves the ''Heart of Gold'' from missiles, but Zaphod brushes this off immediately when Arthur tells him [[ExactWords "it was nothing really."]] Justified in that Zaphod is from Betelgeuse, where they don't have sarcasm, and presumably lack other figures of speech too:
-->'''Zaphod''': That was good thinking, Earthman. You just saved your lives!
-->'''Arthur''': Oh, well, it was nothing really.
-->'''Zaphod''': Oh, was it? Oh, well, forget it then.
** Averted later on Lamuella when he becomes the Sandwich Maker: the blacksmith and baker both consult his wisdom in matters related to cutlery and baking, and everyone appreciates his mad sandwich-making skillz.
* PajamaCladHero: Despite his dressing gown being iconic, Douglas Adams himself didn't realise that Arthur would logically still be wearing it after leaving Earth until the TV series was made, meaning that Arthur's pajama clad status was not mentioned in the radio series or the first two books.
* ScreamsLikeALittleGirl: Not very often, but lets out unusually high shrieks at times in the radio series.
* SpotOfTea: A RunningGag is his inability to get a cup of tea.
* SupremeChef: When he gets stranded on Lamuella in ''Mostly Harmless'', having nothing better to do with his time he becomes a supremely brilliant sandwich maker, revered by the local community.
* UnfazedEveryman: The former TropeNamer.
* UnknownRival: [[spoiler:Agrajag, a reincarnating being who Arthur has unknowingly killed many, many times over. Agrajag is understandably annoyed.]]
* UnwittingInstigatorOfDoom: When standing around in Slartibartfast's office, Arthur casually remarks he "seem to be having tremendous difficulty with [his] lifestyle". Through a freak of probability, a small wormhole momentarily passes through the room, carrying Arthur's words through time and space to where the heads of two armies are about to go to war over a grievous insult. As it turns out, "I seem to be having tremendous difficult with my lifestyle" is the most hideous insult in Vl'hurg language, kick-starting a long and bloody war that eventually results in both fleets being eaten by a small dog. All without Arthur ever knowing.
* TheWatson: He's new to the whole universe thing. Bonus points for being played by ''Creator/MartinFreeman'' who played the TropeNamer on ''Series/{{Sherlock}}''.

!!Ford Prefect
[[caption-width-right:143: "Hey, you sass that hoopy Ford Prefect? There's a frood who really knows where his towel is."]]
-> Radio: Geoffrey [=McGivern=]; TV: David Dixon; Film: Mos Def

* ArtifactAlias: Ford Prefect is so named due to a research error in which he mistook the name 'Ford Prefect' as an equivalent to 'John Smith', without realising that it was the name of a popular model of car, which his shoddy research had led him to believe was Earth's dominant species.[[note]]This is backed up in the Author's Note in The Ultimate Hitchhiker's Guide to the Galaxy, the one-volume compilation of the Trilogy, published well before the movie deal was finally struck.[[/note]] However, he continues to be called this (as opposed to his birth name, which is unpronounceable, or his childhood nickname, Ix) by everyone long after Earth is destroyed. Even characters who hadn't seen him since before he was stranded on Earth and would have [[FridgeLogic no way of knowing this pseudonym]], like childhood friend and semi-cousin Zaphod Beeblebrox. The explanation is apparently that the Galactic civil service has access to time machines - who doesn't? - and finds it easier to change his name so that it has ''always'' been "Ford Prefect" than it would be for them to maintain two records for the same person.
* BearerOfBadNews: When you tell everyone you meet that the world is going to end in a few minutes, you are indeed a bearer of bad news.
* TheBlindLeadingTheBlind: Anytime Ford tries to attempt {{Technobabble}}, it becomes abundantly clear he knows as little about it as Arthur, or sometimes less. One moment in the radio series had him try to explain TimeTravel with a wine bottle and a napkin.
* CheshireCatGrin: Smiles "a little too broadly, giving people the unnerving impression he was about to go for their neck." David Dixon in the TV series took this and ran with it.
* CreepyBlueEyes: In the TV series. The actor tried using purple contacts but they were just gilding the lily of his already creepily intense eyes. (In ''Literature/AndAnotherThing'' it's revealed that Ford finds it relaxing to not blink and can go for eight minutes without doing so -- he's timed it and wonders if it's a new record.)
* DeadpanSnarker: Actual verbal irony is not a concept they have on his planet, but he still manages to be a smart-ass without it.
* [[spoiler: DiedLaughing]]: [[spoiler: As the Earth is destroyed in Literature/MostlyHarmless.]]
* TheDragAlong: In ''Life, The Universe, and Everything'', Ford isn't too keen on the whole "saving-the-universe" thing, but is dragged along by Slartibartfast anyway.
* FashionDissonance: Ford wears tacky abstractions of Seventies fashion.
* {{Herald}}: Sends Arthur on an adventure, but far from a traditional example and in no way a mentor to the protagonist.
* HeterosexualLifePartners: With Arthur. Of all the humans to save from Earth's untimely destruction, Ford chooses his best mate in the hopes that they can bum around the galaxy together and have a laugh.
* HumanAlien: Despite presumably being the same species as Zaphod (they're semi-cousins) Ford doesn't have any extra appendages and looks perfectly human, give or take a disturbing smile.
** It should be noted that Zaphod's third arm is not a natural feature, but something he acquired (either to help with his "ski-boxing", or so he could fondle all three of famed prostitute Eccentrica Gallumbits' breasts at the same time).
* ItsAllAboutMe: Not as bad as Zaphod, but he was more concerned with his sacrifice of a pair of shoes than Arthur's daughter going missing.
-->'''Arthur''': [[LampshadeHanging I think we have different value systems.]]
-->'''Ford''': Mine's better.
* LastOfHisKind: To some minor degree, according to a [[FootnoteFever footnote]], but he doesn't seem to let it get him down.
* MrExposition: He tries to be this to Arthur, [[TheBlindLeadingTheBlind but barely knows as much as Arthur.]]
* NoNameGiven: "Ford Prefect" is an alias used on Earth due to Ford believing that cars were the dominant life form on the planet. A footnote reveals that Ford is the last remaining survivor of the Great Collapsing Hrung Disaster on Betelgeuse VII, and his original name was thus lost. His schoolmates on Betelgeuse V nicknamed him 'Ix', which in ''their'' language means [[TranslationYes "boy who is unable to satisfactorily explain what a Hrung is, or why it should collapse on Betelgeuse Seven."]]
* PurpleEyes: For the TV version, David Dixon put in purple contacts to make his eyes look stranger. For filming, they decided his eyes looked plenty strange enough, thank you very much.
* RaceLift: Appears to be, or is described as, white in all versions but the film, where he is black.
* ReallySevenHundredYearsOld: According to the books, he is approximately two-hundred years old.
* RummageSaleReject: In the TV series, he wears a carefully clashing outfit involving a striped cricket blazer and an Argyle sweater.
* SarcasmBlind: They don't have sarcasm in Betelgeuse. He eventually learns it in ''{{Literature/And Another Thing}}'', to Arthur's pride.

!!Zaphod Beeblebrox
[[caption-width-right:254: “If there's anything more important than my ego around, I want it caught and shot now.”]]
-> Radio and TV: Mark Wing-Davey; Film: Creator/SamRockwell

* AdaptationDyeJob: Blonde in the books, dark hair in the TV series.
* AmnesiacDissonance: He erased some inconvenient memories so he could become President, resulting in a new persona who finds he's not really on-board with his past self's machinations.
** We get to see his past self briefly in {{Literature/Young Zaphod Plays It Safe}}. He's got more moral scruples than the Zaphod we know.
* BizarreAlienBiology: Two heads and thee arms. Depending on the version of the story, they're either natural for his species or Zaphod added them himself for a multitude of reasons.
* CorruptPolitician: He is mentioned as being one of the most successful Presidents the Galaxy has ever had, having already spent two years of his ten-year term in prison for fraud.
* TheFool: Mostly because many of his apparently random impulses are actually related to memories he erased from his mind years ago. He'd rather not think about it too hard.
* GeniusDitz: He's a hedonistic, self-absorbed thrill seeker but he has moments of brilliance. His past self was much smarter, given the master plan he cooked up to meet and confront the ruler of the universe.
* TheHedonist: Just like Ford.
* InferioritySuperiorityComplex: He claims to be insecure, but he's possibly just doing it for the attention.
* InformedAttribute: Voted the worst dressed sentient being seven years running. Quite a few characters compliment his outfit.
* JerkWithAHeartOfGold: In more than one way. He is a jerk, but is a nice guy at heart. Also, his ship is called The Heart of Gold.
* LargeHam: Especially the Sam Rockwell Zaphod.
* TheLoad: In [[Film/TheHitchhikersGuideToTheGalaxy the movie]], he spends the latter half somewhere between this, TheMillstone, and vaguely useful, because he's missing one of his heads. Ford actually has to drag him around in one or two scenes. Also, when they're getting shot at, he apparently thinks it's a dance party. Fortunately, Vogon soldiers make even the ImperialStormtrooperMarksmanshipAcademy look good by comparison.
* MultipleHeadCase: Subverted in most adaptations (where there's no distinction between the two heads), pretty much played straight in the movie, and zigzagged in the sixth novel, where the second head has a distinct personality after being removed and attached to the Heart of Gold.
** In the film, Zaphod's second head often sports a SlasherSmile while making serious threats, like promising to pull Arthur's spleen through his mouth.
* MyOwnGrampa: Apparently there was "[[NoodleImplements an accident with a contraceptive and a time machine]]."
* {{Narcissist}}: Oh so very much:
-->"If there's anything more important than my ego around, I want it caught and shot now."
* ObfuscatingStupidity: Also quite capable of ''actual'' stupidity. Telling the difference is tricky.
** And sometimes it's a case of BrilliantButLazy: he's quite capable of figuring it out for himself but wants someone else to spare him the bother.
* ReallySevenHundredYearsOld: According to the books, he's two-hundred years old.
* ScrewySquirrel: He is a complete scoundrel, will screw almost anything over for personal gain, and is far from a role model. Practically the reason why he is the president of the galaxy in the first place, actually.
* SmallNameBigEgo: Downplayed in that he's a Big Name, Big Ego.
* ThatManIsDead: In the back story he lobotomised himself to keep his plans secret even from himself. However, turns out that the 'new him' hates the old one and actively works against those plans.

!!Tricia [=MacMillan=]/Trillian Astra
[[caption-width-right:259: "It was either this or the dole queue again on Monday."]]
-> Radio: Susan Sheridan; TV: Sandra Dickinson; Film: Creator/ZooeyDeschanel

* AbsoluteCleavage: Her red outfit in the TV series.
* AdaptationDyeJob: She has dark hair in the books, blonde in the TV series.
* AdaptationalNationality: She's American in the TV series and the film.
* AdvertisedExtra: In the radio version.
* AmbiguouslyBrown: In the books, where she's "darkish", with black hair and brown eyes and a "vaguely Arabic" appearance when she wears a headscarf, although her actual ethnicity is never mentioned.
* BadassDriver: Having grown up on Earth and having spent what can only have been a couple of weeks aboard the ''Heart of Gold'', Trillian becomes such a good pilot that she successfully evades two guided missiles for several minutes. After one especially spectacular manoeuvre:
-->'''Ford''': Where the hell did you learn that, Trillian?
-->'''Trillian''': Going around Hyde Park Corner on a moped.
* BrainyBrunette: Originally an astrophysicist and mathematician.
** Directly in contrast to the DumbBlonde from the TV-series and her ''Tricia [=MacMillan=]'' reporter-self from ''Literature/MostlyHarmless''.
* InformedAbility: Trillian is described by Arthur as "devastatingly intelligent" and has a degree in maths and another in astrophysics, but she doesn't get to show it very often. In ''Life, The Universe and Everything'' she argues skilfully with the Krikkit War Council, but most of the time Trillian is just slightly more intelligent than everyone else.
* [[LastOfHisKind Last Of Her Kind]]: After the Earth is blown up, she's the last female Earth person. Again, subverted later.
* MarriedToTheJob: As a reporter in ''Literature/MostlyHarmless''.
* MyBiologicalClockIsTicking: At the time she had Random.
* OnlyKnownByTheirNickname: "Trillian" is just a "spacy" nickname Zaphod gave her based on her real name, Tricia [=McMillan=].
* ParentalNeglect: Her MarriedToTheJob lifestyle means she is a pretty neglectful mother towards Random.
** She becomes less neglectful in {{Literature/And Another Thing}}.
* PromotedToLoveInterest: In the film, she's Arthur's love interest. In every other version, Arthur tried unsuccessfully to flirt with her at a party before the events of the story and that was that.
* RaceLift: Described as "vaguely Arabic" in the first book, implying she has South Asian ancestry. Played by white actresses in both the TV series and the film. In the comic book, she has the same pale skin as Arthur and brown hair instead of the black she has in the books.
* TheSmurfettePrinciple: The only female character of note until Fenchurch and Random came along in the fourth and fifth books, respectively.
* WomenAreWiser: She gives the impression of having her act together even when she doesn't. She's easily the most sensible and mature person aboard the ''Heart of Gold.'' (And there's an OverlyNarrowSuperlative if there ever was one.)

!!Marvin "the Paranoid Android"
[[caption-width-right:217: "Life. Don't talk to me about life."]]
-> Radio: Stephen Moore; TV: voiced by Stephen Moore, body of David Learner; Film: voiced by Creator/AlanRickman, body of Creator/WarwickDavis

* CatchPhrase: "I think you ought to know I'm feeling very depressed", "Life? Don't talk to me about life." some of the first two lines he says when introduced in every continuity of [=H2G2=]. There's also his "Here I am, brain the size of a planet..." speeches.
* TheChewToy: He gets treated like crap (or makes himself believe he is, at times) by almost everything in the entire universe. The fact that he is several times older than the universe itself in the later books doesn't help much, either.
* TheConstant: And he's ''not'' happy about it.
* CuteMachines: More than anything, you can't help but want to hug him.
* DeadpanSnarker: You'd be snarky too if you hated everyone and everything. Unlike most examples of the trope however, Marvin gets no pleasure from his sarcasm. Crosses over into ServileSnarker.
* TheDragAlong: He has to be dragged along by the other characters: he'd much rather lie somewhere, moping.
* TheEeyore: Alive and not happy about it.
* EyeLightsOut: [[spoiler: His death at the end of {{Literature/So Long and Thanks for all the Fish}}, after he sees God's final message to His creation.]]
* FamousLastWords: [[spoiler:[[OOCIsSeriousBusiness "I think I feel good about it."]] This was his response to God's last message to His creation: "We apologize for the inconvenience."]]
* FlawedPrototype: Marvin was the unsuccessful prototype for the personality chip. Everything else that has it is irrepressibly cheerful all the time-- including Eddie, a ship AI who will cheerfully tell you you're about to be vaporized by nuclear missiles, and even the ''individual doors'' which all thank you for passing through them. Marvin hates them all.
* ImageSong: He had four such songs sung by Stephen Moore, his actor from the original radio and TV series.
** [[http://www.youtube.com/watch?v=5I83bVvD8Fw Marvin]].
** [[http://www.youtube.com/watch?v=YX-IPyjFmuQ Reasons To Be Miserable]].
** [[http://www.youtube.com/watch?v=owr2sbcUHwA Metal Man]].
** [[http://www.youtube.com/watch?v=5ImiqaXBMkM Marvin I Love You]]
* InsufferableGenius: He's ten thousand times smarter than everyone else, and regularly insults and shoots down at other people's suggestions.
* IntelligenceEqualsIsolation: Marvin often ends up alone by himself- not just to sulk, but because most everyone he interacts with gets bummed out by his depressing worldview and either leaves him alone or, in two cases, kill themselves.
* LongLived: Played UpToEleven. By the end of ''So Long, and Thanks for All the Fish'', [[spoiler:he reveals that, thanks to time-travel, he is no less than 37 times older than the universe itself]].
* MundaneUtility: Marvin has a brain the size of a planet, and he's only assigned simple household tasks.
* PersonalityChip: As stated above: A flawed prototype.
* PetTheDog: He's unfailingly critical of all life forms, as well as all robots (including himself, except in the area of intelligence). But he does have a kind word for Trillian's deductive ability in ''Life, the Universe and Everything:''
--> '''Marvin:''' That girl is one of the least benightedly unintelligent life forms it has ever been my severe displeasure not to be able to avoid meeting.
* RidiculouslyHumanRobot: Subverted. While ''humanoid'', his emotion chip is supposed to emulate real emotions. Unfortunately, it does that ''[[GoneHorriblyRight too]]'' well, and only with depression.
* RobotBuddy: Under certain [[WithFriendsLikeThese definitions]] of the word "buddy". The marketing division of the Sirius Cybernetics Corporation was probably referring to a different robot when it advertised "Your Plastic Pal Who's Fun To Be With!"
* SecondLawMyAss: Marvin is a low-grade version of this trope: he'll obey, but he won't like it, and he'll never let you forget it.
* SlidingScaleOfRobotIntelligence: Easily of DeusEstMachina levels intelligence, but it's ''never'' put to full use.
** At one point he is put in charge of all the computing for a robotic army and fleet that can take on the whole galaxy at once, and is still so under-challenged that he composes little poems to keep himself occupied.
* SuperPoweredRobotMeterMaids: Brain the size of a planet, and yet they only ask him to do [insert menial task here]? How very depressing.
* TimeAbyss: Oh so very, very much. In one instance he stays in one spot from approximately 1980 until ''the end of the universe''. By the end of the series he is, by virtue of TimeTravel, six times older than the universe itself! He is then brought back to life again because numerous characters that lived when he was created were still alive, and [[InsaneTrollLogic that went against the Lifetime Insurance Policy]] of Sirius Cybernetics Corporation.
--> "The first ten million years were the worst. And the second ten million, they were the worst, too. The third ten million I didn't enjoy at all. After that, I went into a bit of a decline."
* TinmanTypist: Marvin sometimes uses vocal commands. In the TV version he opens the black spaceship's airlock by saying "Abracadiodularservosystems". It would be hard to judge whether he would find a plug in or voice control easier. He'd certainly be depressed by either option. In the novels, on the one occasion he directly interfaced with another AI it was DrivenToSuicide, so it's probably justified.

[[caption-width-right:259: "Hang the sense of it all and keep yourself busy."]]
->Radio: Richard Vernon (first and second series), Creator/RichardGriffiths (fourth, fifth, and sixth); TV: Richard Vernon; Film: Creator/BillNighy

* BeleagueredBureaucrat: Comes off as one in the 2003 film as played by Bill Nighy.
* {{Expy}}: Of [[Series/DoctorWho the Doctor]] in {{Literature/Life the Universe and Everything}} due to the book being an adaptation of a rejected Doctor Who serial by Douglas Adams, ''Doctor Who and the Krikkitmen.'' Both the Doctor and Slartibartfast are very old human-looking aliens who travel through space and time righting wrongs in a weird looking spaceship (a police box for the former, an Italian bistro for the latter). Ford and Arthur even act as [[TheWatson companion]] stand-ins.
%%* HumanAlien
* MrExposition: In both the first and third books, he gives out plot relevant information on galactic history and technology.
* NoNameGiven: Subverted. It's not important.
* WizardClassic: In the TV series, he looks a lot like Gandalf. While not an actual wizard, he looks and acts the part.

[[caption-width-right:220: "Bloody apathetic planet, I've no sympathy."]]

* AlwaysChaoticEvil: Subverted. According to the Guide itself, they are "''not actually evil, but bad-tempered, bureaucratic, officious and callous.''"
* BadBoss: A Vogon captain killing most of his crew in a violent rage is pretty normal for them.
* {{Determinator}}: By all indications, the Vogons were never supposed to survive, or become sentient (their brains are a badly misplaced liver). And yet, they're still around, being too damn stupid to kill.
* EvolutionaryLevels: They're a species evolution didn't so much forget, but rather completely gave up on the minute it saw them.
* GreenAndMean: Vogons aren't exactly known for their kindness.
* ObstructiveBureaucrat: That's right, [[PlanetOfHats the entire race]]. So much so that a Vogon won't lift a finger to save their own grandmother from a painful death without an overly elaborate amount of paperwork being signed first. In triplicate.
* PlanetOfHats: They're all unpleasant bureaucrats. Every last one of them.
** Except for the ones who just want to shout their way through life.
* RubberForeheadAliens: In the TV series. In the film, thanks to a much bigger budget, they look much more impressive and alien.
* SuckinessIsPainful: Vogon poetry can kill people. The mere ''threat'' of Vogon poetry can kill people. Only one or two creatures in the universe ever made worse poetry (including a human).

!!The Ruler of the Universe
->Radio: Stephen Moore

* CaptainOblivious: The Ruler has no idea that he rules the Universe. This makes him perfect for the job. He also has no idea that his table can't talk to him.
* CloudCuckooLander: He has some very interesting thought patterns.
* HairOfGoldHeartOfGold: Downplayed. He's blonde, and he's very, very polite to his guests and his cat. However, he never does any overwhelming acts of good and immediately forgets about Zarniwoop when he leaves the shack.
* {{Manchild}}: He really doesn't know... ''Anything.'' He refuses to accept anything he can't directly perceive right this second. This notably includes ''the past''.

!!Wowbagger the Infinitely Prolonged
->Radio: Toby Longworth

* TheCameo: [[spoiler: He shows up at the end of a Douglas Adams short story, {{Literature/The Private Life of Genghis Khan}}, and insults Khan to his face, thereby indirectly causing the Mongol's massacres.]]
* CompleteImmortality: Wowbagger is eternal.
* DeathSeeker: Subverted. While he envies the dead and dying, he knows there's no point in trying to emulate them.
* EmbarrassingFirstName: Revealed in ''And Another Thing:'' his first name is Bowerick. He stopped using it because people were calling him Bow-Wowbagger.
* {{Jerkass}}: Wowbagger has become entirely soured by his immortality. He doesn't like anybody. So he decided to tell them so. All of them. Everywhere.
* NoodleImplements: Wowbagger became immortal through a curious accident involving a rubber band, a boxed lunch, and a high-powered particle accelerator.
** The book throws in a DoNotDoThisCoolThing warning: "The precise details of the accident are not important because no one has ever been able to recreate the exact circumstances, and a lot of people have wound up looking very silly, or very dead, or both, trying."
* SelfImposedChallenge: He recognizes that his purpose in (eternal) life is meaningless and stupid, but he picked it as the only thing he could work up some interest in.
* WhoWantsToLiveForever: Best shown by the fact that he has watched every movie ever made at least thirty thousand times. He's utterly bored, leading to his impossible goal of personally insulting every living creature in all of time and space.

->Radio: Jane Horrocks; TV: uncredited

* BrickJoke: She is the subject of one, when the [[Literature/SoLongAndThanksForAllTheFish fourth book]] opens with a narration identical to that of the first book, then reveals that Fenchurch was the woman mentioned therein.
* ChekhovsGunman: She is revealed to have been the woman at the start of the first book who had the startling revelation.
* {{Distaff Counterpart}}: She's slightly awkward, very ordinary, extremely British and carries a great secret of the universe around in her head but she can't remember exactly what it is. Arthur without the Y chromosome, really.
* DroppedABridgeOnHer: She's removed from the narrative very quickly in {{Literature/Mostly Harmless}}. [[CreatorBreakdown Douglas Adams was having a miserable year.]] [[spoiler: She returns in ''And Another Thing'' but only very briefly as [[YankTheDogsChain poor Arthur is whisked away from her again.]]]]
* MeaningfulName: Named for the Fenchurch Street railway station, where she was conceived in the ticket queue.
--> '''Fenchurch:''' You would be astounded how bored people can become in that queue.
* LookMaNoPlane: While entering the MileHighClub.
* LoveInterest: To Arthur.
* OnlyOneName: Her surname is never given.
* ReplacementGoldfish: In the sixth book, Arthur tries to replace her with a ship's hologram that takes on her appearance, with mixed results.
* RetGone: At the start of ''Mostly Harmless,'' she suddenly never existed.
* [[UnfazedEveryman Unfazed Everywoman]]: She matches Arthur nicely here.

!!Random Frequent Flyer Dent
-> Radio: Samantha Béart

* ApocalypseMaiden: Random's actions lead directly to the annihilation of the Earth. (The second one.)
* BrattyTeenageDaughter: Extremely rude towards her father.
* DeadpanSnarker: In one line towards the Guide Mark II:
--> 'Oh, great. A laser show,' said Random fractiously. 'Never seen one of ''those'' before, except at about five million rock concerts.'
* {{Foreshadowing}}: Unintentionally; there's a throwaway line Arthur makes near the beginning of the story about [[BeCarefulWhatYouWishFor wishing he had a daughter so he could forbid her to marry a Vogon.]] The stage adaptation treats this as a BrickJoke.
* LittleMissBadass: Well, she does like to throw rocks at people who annoy her. And keeps a specially sharpened one in her pocket for the right occasion, which she can "cause a lot of trouble with".
* PerpetualFrowner: Never smiles. Ever.
* UnwittingPawn: [[spoiler:Being manipulated by the Guide Mk II.]]

!!The Hitchhiker's Guide to the Galaxy ("The Book")
-> Radio: Peter Jones (first and second series), William Franklyn (third, fourth, and fifth); TV: Peter Jones; Film: Creator/StephenFry

* CozyVoiceForCatastrophes: Particularly Peter Jones. In one particularly stressful scene in the television series, he assures the main characters' safety in advance while pleasant images appear on the screen.
* EncyclopediaExposita: Is constantly quoted throughout the story on every subject in the galaxy the audience needs (or doesn't need, for that matter) to be told about- PlayedForLaughs, of course.
* EveryoneHasLotsOfSex: As far as The Guide's editors are concerned. The guide justifies it on the grounds that there's nothing else to do.
* FootnoteFever:
** The glossary, since it's ripped off a cereal box (which ripped off The Guide thanks to TimeTravel).
** According to a scene in the TV series, the glossary itself is actually larger than the rest of the guide put together.
* InsaneTrollLogic: Used to prove that the universe is actually not populated at all. To whit - the universe is infinite. While there could be an infinite number of worlds, they can't all be inhabited. Any finite number divided by infinity is next to zero as makes no odds, so all those people out there are actually the result of a deranged imagination.
* KnowNothingKnowItAll: The Guide proclaims to be definitively accurate, even though it has many glaring omissions, and contains much that is apocryphal. The Guides' creators eventually stated that the Guide ''was'' accurate, and it was reality that was getting it all wrong.
* PhraseCatcher: "Oh, that thing."
* StrangeMindsThinkAlike: On the subject of the marketing division of the Sirius Cybernetics Corporation, the Guide states that they're "a bunch of mindless jerks who'll be the first against the wall when The Revolution comes". A copy of the Encyclopedia Galactica which had fallen through a time warp from a thousand years in space said much the same, only it states they ''were'' the first against the wall when The Revolution came.

!!Deep Thought

* {{Anticlimax}}: In-universe. It took Deep Thought seven and a half million ''years'' to work out The Answer. It came out with "42". Its creators were not exactly impressed.
* GiverOfLameNames: [[spoiler:Nobody was impressed when it dubbed its creation "the Earth".]]
* InsistentTerminology: Immediately after being turned on, Deep Thought declares itself the ''second'' greatest computer of all time, because there is another, far greater computer which it knows it will one day create.
* LargeHam: The radio, and TV versions especially, what with having Valentine Dyall's booming voice.
* LiteralGenie: Seven and a half million years were spent working out the Answer to Life, the Universe, and Everything. At the end of it, Deep Thought proclaimed the answer was "42". After some incredulous responses, Deep Thought points out they never once bothered to think what the Question was.
* MasterComputer
* SmallRoleBigImpact: Deep Thought only appears in a flashback, but that flashback reveals it helped kick-start the plot, [[spoiler:what with creating Earth and all.]]
* SophisticatedAsHell: Deep Though speaks exactly as you'd expect a computer made by a hyperintelligent race of pan-dimensional beings to be... except briefly while pointing out to Broomfondle and Magicthighs how they could benefit while waiting for the Answer.
-->'''Deep Thought:''' So long as you keep violently disagreeing with one another, and slagging each other off in the papers, and so long as you have clever agents, you can keep yourselves on the gravy train ''for life''.
* ThisIsGonnaSuck: Before giving The Answer, Deep Thought pauses, and tells the people its giving the answer to that they're not going to like it.