!! [[color:#c7a900:Sam Herbert]]

--> "Look, I don't want your 'help,' okay? I was just leaving!"

A sysadmin and the first character introduced. Hates to be around others and wants to get out as soon as possible. He has number '''[[color:#c7a900:0]]'''.

* AbusiveParents: [[spoiler:Subverted. He initially doesn't seem keen on his dad...but then we have a flashback and both he and the readers realize he [[GoodParents one of the most accepting and positive figures in his life]], if [[TheGamblingAddict a little neglectful]]. It's also mentioned that Sam's mother could be "scary" sometimes, but that she couldn't seem to help it.]]
* ButtMonkey
* ConspiracyTheorist: He's beginning to get some ideas about the hospital and the people he meets there.
* GolfClubbing: Though he hasn't played in a long time.
* HairTriggerTemper
* [[spoiler: HeroicBSOD: After gaining the realization that the hospital he and the rest of characters are trapped in is indeed a virtual one, he slowly makes his way to his bed and curls up in a confused mess.]]
* [[spoiler:IJustWantToHaveFriends]]
* JerkAss / JerkWithAHeartOfGold: Somewhere between the two. He honestly hates dealing with other people, but he's not malevolent, just suspicious and wants to avoid being taken advantage of.
* MessyHair
* MilkyWhiteEyes
* [[spoiler:MissingMom]]
* MyHeroZero
* [[spoiler:RageAgainstTheReflection]]
* [[spoiler:TheGamblingAddict: His dad.]]
* TheNapoleon: He's the shortest male in the cast, with a temper to boot.
* {{Nerd}}: Unattractive, dislikes socializing, good with computers.
* NiceJobBreakingItHero: [[spoiler:Eventually realizes that wiping the computer to cover his tracks and swiping the information from it without mentioning it to anyone has caused serious problems and delays for Grey.]]
* PerpetualFrowner
* ShockAndAwe: His associated element.
* SourOutsideSadInside
* TeensAreMonsters: He didn't like high school much.
* [[spoiler:{{Transsexual}}]]
* TwitchyEye: [[http://nixshadow.com/mspfa/?s=275&p=54 Has one]] when he gets annoyed.
* UnwittingInstigatorOfDoom: [[spoiler: Investigating the basement early and alone caused the situation to escalate severely.]]
* WouldHitAGirl: Quin learns first-hand that chasing and cornering Sam is [[http://mspfanventures.com/?s=275&p=731 not a good idea.]] It immediately lampshaded on the next page.
-->"What kind of twisted freak would hit a girl?!"

!! [[color:#c75900:Percy O'Neil]]

--> "Surely we could compare notes! Aren't you as confused as I?"

A nonfiction-novelist-slash-newspaper-columnist. Never seen without his notebook and is trying hard to figure out the hospital's mysteries. He has number '''[[color:#c75900:4]]'''.

* [[spoiler:AbusiveParents]]: [[spoiler:Percy's folks worked him to the bone, resulting in the overanxious perfectionist he is as an adult. His own Shadow is a personification of a critical, domineering parental voice.]]
* BigOlEyebrows
* CreatureOfHabit: Follows a pattern in that he always asks questions of every new person he meets and takes notes on every odd thing he finds.
* [[spoiler:DeniedFoodAsPunishment]]: [[spoiler:Shadow Percy mentions his parents refused him food until he'd done his work.]]
* DishingOutDirt: His associated element.
* ExpressiveMask: His glasses.
* EyeGlasses: It's an ongoing joke by the author that the glasses may as well ''be'' his eyes.
* HenpeckedHusband: If his flashbacks are to be believed.
* NeatFreak: He feels obligated to make his bed after he wakes up and closes doors in the hallway.
* RantInducingSlight: Eventually blows up at Rick.
* TheSouthpaw
* StealthPun: [[spoiler:Percy's Shadow is a literal "inner critic".]]
* SuperOCD
* WhyDidItHaveToBeSnakes: Has an [[http://nixshadow.com/mspfa/?s=275&p=28 irrational fear of monsters]].

!! [[color:#c700c7:Ava von Hall]]

--> "This place is spooky! I thought I was soooooo alone here!"

A college dropout and waitress. Appears to care more about flirting and socialization than her new situation. She has number '''[[color:#c700c7:50]]'''.

* AttentionWhore
* [[spoiler:DisappearedDad: Was a one-night stand with her mother.]]
* [[spoiler:DrivenToSuicide: Thinks her birth due to her mother's one-night stand broke up her family, which eventually led her down the "if I didn't exist..." line of reasoning.. Subverted as she didn't go through with it.]]
* GenkiGirl
* GoodBadGirl
* [[spoiler:HeroicBastard]]
* [[spoiler:HeroicBSOD: Undergoes a ''major'' one where she goes dangerously close to the DespairEventHorizon and get possessed by her Shadow.]]
* LightEmUp: Her associated element.
* MaleGaze: Seems to be [[InvokedTrope going for this]] with her unbuttoned shirt.
* NoSenseOfPersonalSpace
* [[spoiler:StepfordSmiler]]
* TheVonTropeFamily
* {{Tsundere}}: Gets huffy when her charms fail on others.
* {{Tsurime Eyes}}
* [[spoiler:TheUnfavorite: Especially as she's an illegitimate child.]]
* YouthfulFreckles

!! [[color:#0000c7:Cherry Trau]]

--> "Uh... never... nevermind... "

A college biology student. Ridiculously shy and has a [[SpeechImpediment stuttering problem]], but tries to be helpful. She has number '''[[color:#0000c7:82]]'''.

* ExtremeDoormat
* EyeTake: She's [[http://nixshadow.com/mspfa/?s=275&p=127 fond]] [[http://nixshadow.com/mspfa/?s=275&p=211 of]] [[http://nixshadow.com/mspfa/?s=275&p=221 these]].
* HugeGuyTinyGirl: With Rick.
* {{Meganekko}}
* MakingASplash: Her associated element.
* MoralityPet: To Rick.
* NonIndicativeName: Is not the red person, nor does she like cherries.
* ShrinkingViolet
* SpeechImpediment: Has a fairly severe stutter, though this may be due to anxiety rather than a genuine speech impediment.
* StutterStop: She seems to speak more clearly when she gets upset enough that she briefly stops being nervous.
* TookALevelInBadass: She manages to gather the courage to [[spoiler:push Louis off a cliff when he starts torturing Ava.]]
* WhoNamesTheirKidDude: She regrets her own name.
** And [[http://mspfanventures.com/?s=275&p=442 Rick]] eventually [[LampshadeHanging brings it up]].

!! [[color:#c70000:Red Diamond]]/[[color:#c70000:Louis]] [[spoiler:Russell]] [[color:#c70000:Stone]]

--> "I don't take kindly to being shoved around."

A stockbroker who introduces himself with an alias. Skeptical and calm, until [[BerserkButton others get on his nerves.]] He has number '''[[color:#c70000:7]]'''.

* AGlassOfChianti: WordOfGod says Louis is very fond of (and knowledgeable about) wine.
* AgentScully
* AmbiguouslyEvil: Is he really that much of a dick or is the hospital just getting to him?
* CastingAShadow: His associated element.
* DisabledSnarker: Apparently has hearing problems.
* DisneyVillainDeath: [[spoiler:At the hands of [[TookALevelInBadass Cherry]]. [[PlayingWithATrope Time will tell if he actually dies.]] His shadow, at least, has resurfaced as a continuing threat.]]
* DissonantLaughter: Laughs as Rick punches him out.
* DoNotCallMePaul: [[spoiler:He does not like being called [[http://mspfanventures.com/?adv=275&id=1122 Russell]]]]
* GoodIsBoring: Seems to follow this line of thinking, purposefully inducing a fight just to get some excitement.
* IHaveManyNames: We only know one, but according to him he has many aliases.
* JerkAss: Even moreso than Sam.
* KickTheDog: So much. One such moment was when he [[spoiler:took Rick's graduation invitation and slowly ripped it in half right in front of him.]]
* [[spoiler:SerialKiller: His father(?), who killed his own co-workers and boss before the events of the story.]]
* SlasherSmile: [[http://nixshadow.com/mspfa/?s=275&p=314 Hello Louis]].
* SmugSnake

!! [[color:#6300c7:Rick L. Worth]]

--> "You must not have run into many good people, but never fear. You've ran into the best possible option."

A football coach and PE teacher. Towers over the rest of the cast and readily talks about himself. He has number '''[[color:#6300c7:81]]'''.

* TheAce: He slathers this persona all over [[http://nixshadow.com/mspfa/?s=275&p=196 his intro]].
** [[spoiler:BrokenAce]]
* BerserkButton: [[spoiler: Having his graduation invitation ripped to pieces]] is enough to send him into a blind rage.
* EyeOpen: [[http://mspfanventures.com/?s=275&p=495 When]] [[spoiler:Louis rips up his graduation invitation.]]
* HugeGuyTinyGirl: With Cherry.
* [[spoiler:IJustWantToBeSpecial]]
* IgnoreTheFanservice: Much to Ava's shock.
* [[spoiler:InferioritySuperiorityComplex]]
* [[spoiler:KickTheMoralityPet: Subverted. He rears back like he's going to hit Cherry after being sent into a HeroicBSOD after encountering his Shadow's BlackBugRoom...then notices she's cowering and backs off, [[PetTheDog apologizing for scaring her.]]]]
* LanternJawOfJustice
* LargeHam
* [[spoiler:ManlyGay / StraightGay]]: Much to Cherry's surprise.
* {{Narcissist}}
* PermaStubble: [[http://mspfanventures.com/?s=275&p=197 Intentionally maintained.]]
* PlayingWithFire: His associated element.
* TopHeavyGuy
* VoodooShark: PlayedForLaughs; His catch-all explanation of the strange occurrences as supernatural only raises more questions.
* [[spoiler:WhenYouComingHomeDad: His parents didn't attend his graduation.]]

!! [[color:#00c713:Juliet Ross]]

--> "I've been expecting you!"

A telephone psychic who has been obsessively painting pictures across the hospital. She has number '''[[color:#00c713:22]]'''.

* BackgroundHalo: In her [[http://nixshadow.com/mspfa/?s=275&p=349 introduction page]].
* BigGood: Early on, she's the one leaving messages and guiding the others. This doesn't last, as the messages are destroyed by the hospital's ChaosArchitecture and the others write her off as a crackpot after meeting her in person.
* BiTheWay: Pansexual, specifically.
* BlowYouAway: Her associated element.
* CouldntFindAPen: Instead, uses milk-based paint.
* CloudCuckoolander: Besides her fingerpainting, she doesn't seem the least bit concerned about her predicament.
* [[spoiler:DespairEventHorizon: Ends up hitting this despite Grey's attempts to reach out to her.]]
* DoesNotLikeShoes
* FourthWallObserver: Addresses the reader directly. [[spoiler: As if they're a voice in her head.]]
* FortuneTeller
* PstandardPsychicPstance: [[http://nixshadow.com/mspfa/?s=275&p=354 Seen here.]]
* [[spoiler:PhonyPsychic: According to Vivian, her Shadow.]]
* StealthHiBye: Pulls one when Sam and Quin leave her big meeting.[[spoiler:It's the result of Vivian taking over.]]
* [[spoiler:SplitPersonalityTakeover: Is unable to face and win against Vivian, and ends up losing control of her virtual body. In the end, they're both destroyed by this.]]
* VaguenessIsComing: Talks about the hospital in this fashion.
* [[spoiler: WrongGenreSavvy]]

!! [[color:#808080:Quin Orwell]]

--> "You're really great at first impressions!"

A photographer who was found on the roof. Gets irritated easily. She has number '''[[color:#808080:83]]'''.

* AnIcePerson: Her associated element.
* DarkSkinnedBlond: WordOfGod says it's bleached.
* [[spoiler: DisappearedDad: He died saving her from drowning in a frozen lake. Needless to say it's left her pretty messed up.]]
* {{Fingore}}: Quin's missing part of her pinky finger on her left hand. [[spoiler: She lost it to hypothermia when she fell into frozen water as a kid]].
* GenderBlenderName: Though her first name is Deirdre, she goes by her more androgynous middle name.
* HairTriggerTemper
* LadyLooksLikeADude
* MoodSwinger
* {{Tsundere}}
* WhyDidItHaveToBeSnakes: She has a phobia towards lakes.

!! [[color:#00adc7:Helen Bixby]]

--> "We have to stick together, okay?"

A well-to-do homemaker who is afraid of being alone. After her number was called by Juliet through the intercom, she woke up on a bed in the middle of a forest within Room 2310. She has number '''[[color:#00adc7:6]]'''.

* BlackBeadEyes
** TaremeEyes
* ExtremeDoormat: Has a really hard time making decisions by herself.
* GreenThumb: Her associated element.
* HappilyMarried: At the very least, she considers her husband wonderful.
* LostWeddingRing: She notices after waking up that her wedding ring has disappeared.
* TeamMom: Doesn't want there to be any fighting.

!! [[color:#111111:Darrel Grey]]

A doctor who was woken up by Helen. He is currently "checking a few things", as per his words. He has number '''[[color:#111111:20]]'''.

* {{Asexuality}}: According to WordofGod
* {{Expy}}: Looks very much like one [[VideoGame/HalfLife Dr. Freeman]].
* ExtraOreDinary: His associated element.
* HatesBeingTouched
* NoSocialSkills
* TheStoic
** TheQuietOne: Doesn't disclose much, even to the audience.
* OpaqueLenses
* WalkingSpoiler: WordOfGod confirms Grey will eventually become this.

!! -the shadows

A group of monsters who patrol the hospital, seeming to be the [[EnemyWithout embodied self-destructive impulses]] of the characters. They have the ability to take the form of a mass of black tentacles or a colored outline of the character they're pursuing at the time. They also seem to have some control over the hospital itself, being able to create doors to surreal {{Black Bug Room}}s which may or may not be the Shadows themselves.

* AChatWithSatan: Their purpose. Some of them are even quite personable to people other than "themselves".
* {{Big Bad}}s: As of yet, or at least the real one's CoDragons.
* BreakingTheFourthWall: [[spoiler:Percy's Shadow gets into his notes, which are also a representation of the out of character Records. He proceeded to vandalize those with nightmarish graffiti until Percy got the notes back.]]
* BreakThemByTalking: Their ''modus operandi''.
* CombatTentacles
* [[spoiler:DarkIsNotEvil: Sam's Shadow turns out to be fairly nice when dealing with people not Sam, even showing Quin and Ava to where he is. He also explains that each Shadow is a representation of a person's repressed personality traits, which means they can represent positive aspects as well.]]
** [[spoiler:Shadow Ava is pretty similar, though she turns more malevolent when faced with Ava and is incredibly clingy.]]
* [[spoiler:DemonicPossession: Seem to be able to hitch a ride with their respective characters when they choose to embrace their negative qualities. They don't seem to be able to influence actions beyond needling their counterparts, but they can make hosts look ''really creepy''.]]
* HearingVoices: ''They're'' the voices.
* {{Jerkass}}: [[spoiler: Shadow Percy and Shadow Cherry]]
* NothingIsScarier: They have a tendency to stalk the characters in "black squiggle" form. They don't notice it, but the audience does.
* [[spoiler:SecretTestOfCharacter: Their goal is to make their normal versions accept the personality traits they represent. This is not a bad thing.]]
* VoiceOfTheLegion: They speak with their respective character's color, in all lower case, on a black highlight.