!!Arthur Dent
[[quoteright:169:http://static.tvtropes.org/pmwiki/pub/images/arthur1_6244.jpg]]
[[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 MartinFreeman

* AchievementsInIgnorance: How he managed to fly. You have to invoke this intentionally but Arthur stumbled across the technique by accident.
* ActionSurvivor: Has survived many crazy science fiction adventures.
* BadassLongRobe: His PajamaCladHero getup does include a long dressing gown.
* {{Butt Monkey}}: Nothing ever goes his way.
* CatchPhrase:
-->'''Arthur''': So this is it. We're all going to die.
* 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 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?
* GenreSavvy: Arthur always suspects the worst will happen, fitting considering he's a character in a [[SlidingScaleOfIdealismVersusCynicism very cynical]] series.
* 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}}.
* {{Iconic Item}}: His dressing gown and his towel.
* NoRespectGuy: He saves the ''Heart of Gold'' from missiles, but Zaphod brushes this off immediately when Arthur tells him [[ExactWords "don't mention it."]]
* 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.
* UnfazedEveryman: The former TropeNamer.
* UnknownRival: [[spoiler:Agrajag, a reincarnating being who Arthur has unknowingly killed many, many times over. Agrajag is understandably annoyed.]]

!!Ford Prefect
[[quoteright:143:http://static.tvtropes.org/pmwiki/pub/images/ford_3774.jpg]]
[[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

* 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.
* CheshireCatGrin: Smiles "a little too broadly, giving people the unnerving impression he was about to go for their neck."
* 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.
* TheHedonist: All he wants from life is to drink copious amounts of alcohol and dance with girls.
* {{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.
* LastOfHisKind: To some minor degree, according to a [[FootnoteFever footnote]], but he doesn't seem to let it get him down.
* NoNameGiven: "Ford Prefect" is an alias used on Earth due to Ford believing that cars were the dominant life form on the planet. His real name was only pronounceable in an obscure and extinct Betelgeusian tongue, and Ford's inability to pronounce it caused his father to die of shame. His schoolmates called him 'Ix', which meant [[TranslationYes "boy who is unable to satisfactorily explain what a Hrung is, or why it should collapse on Betelgeuse Seven"]], the cause of his original language's extinction.
* {{Race Lift}}: Appears to be, or is described as, white in all versions but the film, where he is black.
* SarcasmBlind: They don't have sarcasm in Betelgeuse. He eventually learns sarcasm in {{Literature/And Another Thing}}, to Arthur's pride.

!!Zaphod Beeblebrox
[[quoteright:254:http://static.tvtropes.org/pmwiki/pub/images/zaphod_127.jpg]]
[[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

* 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 of Zaphod added them himself for a multitude of reasons.
* 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.
* 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 of 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]]."
* ObfuscatingStupidity: Also quite capable of ''actual'' stupidity. Telling the difference is tricky.
* ScrewySquirrel: He is a complete scoundrel, will almost screw anything over for personal gain, and far from a role model. Practically the reason why he is the president of the galaxy in the first place, actually.
* 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
[[quoteright:259:http://static.tvtropes.org/pmwiki/pub/images/trillian_9227.jpg]]
[[caption-width-right:259: "It was either this or the dole queue again on Monday."]]
-> Radio: Susan Sheridan; TV: Sandra Dickinson; Film: Creator/ZooeyDeschanel

* 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.
* 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''.
* 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}}.
* {{Promoted to Love Interest}}: 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.
* {{Race Lift}}: 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.
* {{The Smurfette Principle}}: 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.''

!!Marvin "the Paranoid Android"
[[quoteright:217:http://static.tvtropes.org/pmwiki/pub/images/marvin123_3914.jpg]]
[[caption-width-right:217: "Life. Don't talk to be 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 [=H2H2=]. There's also his "Here I am, brain the size of a planet..." speeches.
* TheChewToy: He literally 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.
* {{Deadpan Snarker}}: 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.
* TheDragAlong: Being depressed at all times, he has to be dragged along by the other characters.
* 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.]]
* FlawedPrototype: Marvin was the unsuccessful prototype for the emotion 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: Well, he ''does'' have a brain the size of a planet...
* 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.
* 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!"
* 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
* 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."

!!Slartibartfast
[[quoteright:259:http://static.tvtropes.org/pmwiki/pub/images/slarti_8755.jpg]]
[[caption-width-right:259: "Hang the sense of it all and keep yourself busy."]]
->Radio: Richard Vernon (first and second series), Richard Griffiths (fourth, fifth, and sixth); TV: Richard Vernon; Film: BillNighy

* {{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.
* {{Wizard Classic}}: In the TV series, he looks a lot like Gandalf. While not an actual wizard, he looks and acts the part.

!!Vogons
[[quoteright:220:http://static.tvtropes.org/pmwiki/pub/images/vogon_7866.png]]
[[caption-width-right:220: "Bloody apathetic planet, I've no sympathy."]]

* {{Always Chaotic Evil}}: Subverted. According to the Guide itself, they are "''not actually evil, but bad-tempered, bureaucratic, officious and callous.''"
* EvolutionaryLevels: They're a species evolution forgot.
* {{Obstructive Bureaucrat}}s: That's right, [[PlanetOfHats the entire race]].
* RubberForeheadAliens: In the TV series. In the film, thanks to a much bigger budget, they look much more impressive and alien.
* PlanetOfHats: They're all unpleasant bureaucrats. Every last one of them.

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

* {{The Cameo}} [[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, therefore indirectly causing the Mongol's massacres.]]
* DeathSeeker: He would like nothing better than to finally die. He envies the dead and dying.
* EmbarrassingFirstName: As is revealed in ''And Another Thing,'' his first name is Bowerick. He stopped using it because people were calling him Bow-Wowbagger.
* {{Jerkass}}
* NoodleImplements: How Wowbagger became immortal involves a rubber band, a boxed lunch, and a high-powered particle accelerator. People who have attempted to recreate the circumstances that made him immortal have failed, looking very stupid (or very dead) in the process. Or both.
* 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.

!!Fenchurch
* 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.
* {{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.
* {{Dropped a Bridge on Her}}: 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.
* LookMaNoPlane: While entering the MileHighClub.
* {{Love Interest}}: To Arthur.
* {{Only One Name}}: Her surname is never given.
* {{Replacement Goldfish}}: In the sixth book, Arthur tries to replace her with a ship's hologram that takes on her appearance, with mixed results.
* [[UnfazedEveryman Unfazed Everywoman]]: She matches Arthur nicely here.

!!Random Dent
* BrattyTeenageDaughter: Extremely rude towards her father.
* LittleMissBadass
* 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: StephenFry

* EncyclopediaExposita
----