-> Played by Tommy Wiseau
* AteHisGun: Shoots himself in despair after he locks himself in the titular room and trashes the place.
* BettyAndVeronica: The Betty to Mark's Veronica for Lisa's Archie
* {{Catchphrase}}:
** Oh hai, X.
** That's the idea!
** "Don't worry about that/it." Says this to things people would typically worry about, with variations.
* ColdHam: Thanks to Wiseau's horrible acting. Even when Johnny is screaming and going over the top, he sounds bored with his dialogue.
* DullSurprise: "I did not hit her, it's not true. It's bullshit, I did not hit her! I did NAAAGHT... Oh hi, Mark."
%%* FourTemperamentEnsemble: The Melancholic.
* EyesAlwaysShut: His eyes are usually halfway closed for whatever reason.
* FlowersOfRomance: He buys roses for Lisa so much he's the flower shop's favourite customer.
* {{Gonk}}: Tommy Wiseau isn't as attractive as he thinks he is.
* TheHero: Or at least, this is what Wiseau conceived of him being.
* HongKongDub: A lot of his lines obviously don't match up with his mouth movements.
* TheHyena: "Ts-Hahahahahahahahaha."
* LargeHam: Somehow manages to overlap this with DullSurprise.
* LooksLikeCesare: Black hair, and an appearance that suggests he doesn't go outside much.
* NiceGuy: He apparently buys Lisa a dozen red roses every time they make love, or at least often enough to be the flower shop lady's favorite customer, and would do anything for Lisa. He pays for Denny's college and tuition without asking for anything in return, and is incredibly nice to all his friends and seems to only want to make Lisa happy. From an objective point of view, there's really no logical reason for Lisa to cheat on him, or hate him the way she does.
* TheTeetotaler: The exception being the [[GargleBlaster Scotchka]] scene.
* TooGoodForThisSinfulEarth
* TookALevelInJerkass: Towards the end of the movie, starting with the fight between him and Mark as he discovers that Lisa is cheating on him during his birthday party.
* UnstoppableRage: The scene where Lisa leaves him, causing him to go into a rage and trash his entire apartment, including mustering the strength to throw a massive CRT television (those things are heavy!) straight out the window.
* WhatTheHellIsThatAccent: Especially funny since it's Tommy Wiseau's natural accent.
* YouNoTakeCandle: Slips into this at times, most notably "Everybody betray me! I fed up with this world!"

-> Played by Juliette Danielle

* BeautyIsBad: She's as pretty as she is reprehensible.
* BigBad: Drives the plot by TEARING JOHNNY APART!
* BitchInSheepsClothing: She seems nice, at first. Then we find out that she's cheating on her loving [[InsistentTerminology future spouse]] because she's ''bored'' with him.
* BrainlessBeauty: Her schemes aren't very well thought out.
* {{Catchphrase}}:
** "I don't want to talk about it"
** "Don't worry about it."
* CharacterShilling: Many characters will stop whatever momentum the movie has in order to talk about how great Lisa is.
* TheChick: Right down to being in a LoveTriangle with TheHero and TheLancer.
* {{Determinator}}: Juliette Danielle is, at least. Knowing all the abuse, degradation, and humiliation she endured while making the film, it's truly amazing that she got through it at all.
* DisproportionateRetribution: She's cheating on Johnny because ''she thinks he's boring''.
* DumbBlonde: In a way. Most notably not caring about the fact that if she continues cheating, she's going to destroy Johnny, despite Stevens serious words to her.
%%* FourTemperamentEnsemble: The Choleric.
* HelloNurse: Barely a scene goes by where someone doesn't comment on her attractiveness.
* InformedAttractiveness: Lisa's actress isn't ugly, but she still does not quite live up to how beautiful all the men act like she is.
* ItsAllAboutMe: Case in point, after her future spouse [[spoiler:commits suicide]], her first action is to tell the guy she was cheating on him with (who also happened to be his best friend) that they can finally be together. Mark rightfully calls her out on this.
* {{Jerkass}}: Cheats on her loving future spouse with his best friend because she's bored with him, was implied to have just been using him for money in the first place, lies about him abusing her to justify it and [[spoiler:''tells his best friend that there is nothing between them after Johnny kills himself'']]. At the end, Mark finally grows a spine and tells her off for it.
* ManipulativeBitch: Dear God, Lisa. Mark flat-out lampshaded this.
* PetTheDog: Despite her nastiness, Lisa seems to genuinely care for Denny.
* SatelliteLoveInterest: As the girlfriend, her scenes are limited to having sex and sitting on a pedestal. As the antagonist, she's the axis of the whole film.
* TheSociopath: Peter speculates that she is one based on her behaviour.
* SmugSnake: Sure Lisa, be all secretive and paper thin with your lies and cheating. Johnny will ''[[SarcasmMode never]]'' find out.
* StupidEvil: She makes quite a few mistakes during the movie.
* TheUnfairSex: {{Inverted|Trope}}; everyone acts like the affair is her fault while downplaying Mark's role. Though she was the one throwing it in people's faces.
* YourCheatingHeart: Cheating on Johnny with Mark.

-> Played by Greg Sestero

%%* BeautyIsBad
* BettyAndVeronica: The Veronica to Johnny's Betty for Lisa's Archie
* DullSurprise: His reaction every time Lisa invites him over "[[IsThatWhatTheyreCallingItNow to talk]]" and then winds up trying to sleep with him. As he explained in ''Literature/TheDisasterArtist,'' there was no way for Greg to make his performance seem convincing, so he didn't even try.
* FlatCharacter: [[WordOfSaintPaul Greg Sestero himself]] views Mark this way. [[https://www.reddit.com/r/IAmA/comments/1nbna6/oh_hai_mark_greg_sestero_mark_from_the_room_here/cch41ra?context=1 According to him, any time he tried to add any depth to the role, Tommy would accuse him of trying to be king of the world.]]
* FourTemperamentEnsemble: The Phlegmatic.
* ImAManICantHelpIt: The presumed explanation for TheUnfairSex below.
* ImportantHaircut: Subverted. He shaves his beard and everyone makes a big deal out of it, but it doesn't signal a change in character.
* TheLancer: He's Johnny's ''best friend''.
* MarijuanaIsLSD: Becomes uncharacteristically violent and belligerent after taking just a couple hits from a joint.
%%* MrFanservice
* TheStoner: A hilariously ill-written variation. See MarijuanaIsLSD above.
* {{Tuckerization}}: Attempted. According to ''Literature/TheDisasterArtist'', Tommy named Mark after the lead actor of Film/TheTalentedMrRipley "[[Creator/MattDamon Mark Damon]]".
* TheUnfairSex: {{Inverted|Trope}}; everyone acts like the affair is entirely Lisa's fault.

-> Played by Philip Haldiman

* AmbiguousDisorder: His behavior is... incredibly bizarre for someone who is likely pushing his twenties. Even Tommy Wiseau has admitted the character makes more sense if you think of him as mildly retarded.
* CompressedVice: His drug dealings with Chris-R are brought up once and then never again afterwards.
%%* FourTemperamentEnsemble: The Sanguine.
* KidAppealCharacter: The only kid-like character in the movie (he is implied to be around the age of 18 but looks and acts ''much'' younger). Not that kids are even supposed to be seeing this movie, which is rated R, making him even more inexplicable.
* ManChild: To a degree. He keeps trying to go upstairs with Johnny and Lisa when he knows they're going to have sex, and presumably wants to join in, then follows them upstairs and jumps on the bed. He also talks about how he's "in love" with Lisa like a 7-year old, and fawns over her to a creepy effect.
* NoSocialSkills: "I just like to watch you guys."
* PhraseCatcher: "Oh hai, Denny!"
* PrecisionFStrike: Against Claudette.
* TagalongKid: Denny doesn't have much importance to the plot.

-> Played by Carolyn Minnott

* AngerBornOfWorry: She tears into Denny after she discovers that he was nearly killed by a drug dealer that he owed money to, though she seems to care for Denny's well being in the end.
* AudienceSurrogate: Probably unintentional, but she asks questions the viewers are probably wondering, such as asking [[LeaningOnTheFourthWall "What are these characters doing here?"]] when she [[CoitusUninterruptus walks in on Mike and Michelle making out]], and asking Denny numerous questions about his relationship with Chris-R (none of which are ever answered).
* BrutalHonesty: She flat-out admits to Lisa that she hated her ex-husband, who happens to be Lisa's father.
* GoldDigger: She certainly believes that women should aspire to be this and more or less states that it's the only reason she married Lisa's father.
** She even mentioned how she tried to sponge off Johnny.
* HypocriticalHumour: She states in one sentence how much she [[StrawFeminist dislikes men]], and states in the next sentence that men and women exploit each other.
* TheMentor: The closest thing this movie has to one. Naturally, she's very bad at it.
* OnlySaneWoman: She may be an immoral, self-absorbed hypochondriac, but she's also the only character in this movie who seems even remotely aware of how absurd the plot is.
* PragmaticVillainy: She wants Lisa to marry and be faithful to Johnny so that she can [[GoldDigger live off]] a stable life with him. This ends up with an extreme case of VillainHasAPoint: [[spoiler: If Lisa had listened to her mother, it would have been for the better for ''everyone involved!'' [[DrivenToSuicide Johnny wouldn't have committed suicide]], he and Mark would still be friends, Denny would still receive college tuition, Lisa would, again, live a good life, [[ArsonMurderAndJaywalking and the flower shop would still have their favourite customer]].]]
* StrawFeminist: She has a very low opinion about men, but she's at least open-minded enough to know that women can also be manipulative.
* WhatHappenedToTheMouse: Her breast cancer. It comes up once, then is never mentioned again.
--> "They have cures for everything."
** WordOfGod confirms that [[spoiler:she'll live through it]].

-> Played by Scott Holmes (credited as Mike Holmes in the film, due to Wiseau forgetting the actor's name)

* BetaCouple: With Michelle.
* BlatantLies: He had to run back into the apartment after being caught having sex with Michelle and get his ... book. (That is, his underwear.)
* HaveIMentionedIAmSexuallyActiveToday: In one scene, he tells the rest of the guys he has to leave so he can make out with Michelle.
* LargeHam: He's no louder than the rest of the cast, but his exaggerated facial expressions and non-stop mugging have to be seen to be believed.
* PluckyComicRelief

-> Played by Robyn Paris

* BetaCouple: With Mike.
* ChocolateOfRomance: Which she feeds to Mike.
* [[OnlySaneMan Only Sane Woman]]: The most level-headed of the cast, along with Peter. She knows how destructive Lisa's infidelity is and tries to talk her out of it several times.
** Also the only character who doesn't say "don't worry about it" or "everything's going to be fine".
** And she's the only female character who seems to be a decent person.

-> Played by Dan Janjigian

* TheAggressiveDrugDealer: Aggressive both in how he talks and how he threatens people with weapons.
* ChandlersLaw: He starts the first violent part of the movie.
* ClusterFBomb: "Where's my FUCKIN' MONEY DENNY?!"
* GangstaStyle: How he holds his gun.
* GiantSpaceFleaFromNowhere: He isn't even referenced until he shows up to try and get Denny to pay him. [[WhatHappenedToTheMouse After that, he is never mentioned or referenced again]].
* HotBlooded: Definitely not an even-tempered guy.
* LargeHam: According to ''Literature/TheDisasterArtist'', Dan gave what's considered the most passionate performance in the movie.
* NoIndoorVoice: To be fair, he was outside when he was doing all his yelling. Though presumably being inside wouldn't have stopped him.
* SirSwearsalot: All the dialogue in his one scene is a ClusterFBomb.
%%* SleevesAreForWimps

-> Played by Kyle Vogt

* BusmansHoliday: Is still "playing the psychologist" even when he's off-duty.
* ChuckCunninghamSyndrome: Mysteriously disappears midway through the movie, and is never mentioned again. This is because the actor had to leave to do another movie. Rather than film the important party scenes on his last day, Tommy instead filmed the pointless "football in tuxedos" scene.
* IgnoredExpert: Johnny asks him for some advice about his relationship, which he gives him (for free, even!) and then Johnny gets annoyed and doesn't follow it because he doesn't feel like it. He also tells Mark that he should lay off the drugs, which he doesn't do for the same reason. On top of that, he also (probably correctly) diagnoses Lisa as a sociopath, which doesn't go anywhere either.
* OnlySaneMan: [[TookTheBadFilmSeriously Even in real life]].
* RememberTheNewGuy: Not as much as his replacement below, but he still comes out of nowhere without being properly introduced, halfway through the movie.
* SmartPeopleWearGlasses: The most highly educated character and also the only one in the male cast who wears glasses.
* WhatHappenedToTheMouse: His actor quit mid-movie, so he disappears and Steven takes his place.

-> Played by Greg Ellery

* AllThereInTheScript: His name is only known by the credits.
* EleventhHourRanger
-->[[Podcast/RiffTrax "Um, I'm sorry. Should we know who you are? Hello?"]]
%%* LargeHam
* RealLifeWritesThePlot: He only exists because Peter's actor quit.
* TheReasonYouSuckSpeech: He exists solely to give one of these.
* RememberTheNewGuy: An impossibly lazy example. With about 20 minutes left in the movie, a new character suddenly appears and becomes deeply involved in the plot. Presumably, we're not supposed to notice that he suddenly appeared from nowhere without an introduction. WordOfGod is that Steven is supposed to be a replacement for the psychologist character Peter (whose actor left the production), but the audience is given no hint of this; indeed, Steven looks nothing like Peter.
* SuspiciouslySimilarSubstitute: Originally, Peter had Steven's role, but his actor quit during filming, leading to Steven's creation.

-> AsHimself

* ADogNamedDog: A Doggie named Doggie, specifically.
* AsHimself: Tommy didn't notice him until during the middle of a take. Later, he would ask the dog's owner if it was a 'real thing', perhaps not convinced it was a real animal.
* PreciousPuppy

!!Flower Shop Lady
-> AsHerself
* AsHerself: The owner of the flower shop in real life (it has since closed). She was allowed to appear as herself, as Tommy didn't have any extras to spare for the scene.
* FailedASpotCheck: She fails to recognize Johnny until he takes off his sunglasses.


Claudette's brother (and Lisa's uncle), who wants her to give him a share of her house. Claudette is less than willing to do this.

* TheGhost: Along with Shirley Hamilton.
* {{Jerkass}}: According to Claudette.

!!Shirley Hamilton

Claudette's friend, who wants to buy a new house. Claudette asks Johnny to help her with a down payment, only for him to tell her it's an awkward situation. She expected him to be more generous. The only character in the entire movie to have a surname, yet she's entirely offscreen.

* TheGhost: Along with Harold.