!Reginald P. Linux
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/DoomHouseReginaldPLinux_7596.jpg]]

-> ''"I'm being terrorized! I'm being terrorized by this horrible doll!"''

* AgentScully: Linux constantly scoffs at Officer Cop's insistence that the doom house is real and that he should move, always repeating the words "doom house" with a sense of baffled bemusement and confusion.
* DarkAndTroubledPast: Reginald's wife died some time before the story takes place, and Reginald has been feeling depressed because of it ever since.
* TheDeterminator: No matter how much Reginald is terrorized by the evil of the doom house or advised by the police officer to leave the residence, he is determined to stay there and is eventually able to work out a gentleman's agreement with the house's horrors.
* FreakOut: Linux's inability to understand the anomalous nature of the CreepyDoll and his realization that the doll cannot be removed from the house or destroyed causes him to have a very epic one of these.
* LimitedWardrobe: The story takes place over the course of a few days and nights, but Reginald is only ever seen wearing a ''VideoGame/{{Cubivore}}'' T-shirt and black shorts, occasionally accessorized with a rayon Hawaiian shirt and a baseball cap (again, only one type of each item).
* MysteriousMiddleInitial: P.
* RidiculouslyAverageGuy: He's just an ordinary guy, caught up in an unordinary situation.
* [[spoiler: SoleSurvivor]]

!Police Officer (a.k.a. Officer Cop) / [[spoiler: The Terrorist]]
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/DoomHouseOfficerCop2_2717.jpg]]

-> ''"Reginald P. Linux, I heard you needed a cop."''

* AgentMulder: When Officer Cop first arrives at the house, he is quick to conclude that a paranormal occurrence is the only possible explanation and that the house must be a doom house.
* AppealToAuthority: Constantly reminds Reginald after everything he does or suggests should be done that he is a cop and trained as such, [[spoiler: but this is just a lie intended to win over Reginald's trust.]]
* [[spoiler: BigBad]]
* [[spoiler: DetectiveMole]]: He arrives at the doom house to help Reginald P. Linux [[spoiler: and turns out to be the one responsible for the horror Linux is experiencing.]]
* [[spoiler: FaceHeelTurn]]: [[spoiler: Initially thought to be a friendly police officer, he turns out to be a terrorist.]]
* AFateWorseThanDeath: [[spoiler: Being bored.]]
* GreatDetective: Is able to recognize a doom house after {{Sherlock Scan}}ning plastic baggies.
* LimitedWardrobe: Only wears a plain navy T-shirt and jeans. No shoes.
* NoNameGiven: His name is Officer Cop, as revealed in the Japanese anime series, but in the original ''Doom House'' this character is unnamed and only identified as "Police Officer" in the credits.
* StepfordSmiler: With blank, vacant eyes and muted emotions, his constant grinning appears all the more unsettling.
* [[spoiler: TerroristWithoutACause]]: [[spoiler: His focus is to harass a single person into leaving a house so he could reclaim a [[IndianBurialGround "Terrorist Burial Camp"]].]]

!The Doll
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/DoomHouseDoll_277.jpg]]

-> ''"You're going to '''die!''' I'm gonna cut your hair, and put it in a '''bowl!'''"''

* BlueAndOrangeMorality: Its actions and motivations cannot be understood through human logic or reasoning, but over time, Linux and the doll are somehow able to work out a "gentlemen's agreement", the exact terms of which are unknown.
* ClingyMacGuffin: It's an "odd-looking figurine" which haunts the doom house and constantly appears near Linux, even after he grinds it up in the garbage disposal.
* CreepyDoll: Just look at that thing!
* CutHisHeartOutWithASpoon: It seeks to cut off hair and place it within the confines of a bowl.
* EvilPhone: The device through which the doll communicates with occupants of the doom house.
* OffscreenTeleportation: How it moves around the doom house.
* [[spoiler: RedHerring]]: [[spoiler: At first, we're supposed to think that Linux is being terrorized by a horrible doll, but he is, in fact, being terrorized by a terrorist.]]
* TheSpeechless: Only heard speaking once, off camera and over a phone.

!Reginald P. Linux's Wife

* {{Backstory}}: Died in a tragic NoodleIncident.
* TheLostLenore: For Reginald.
* PlotTriggeringDeath: Her death is the catalyst for everything that follows afterward.
* PosthumousCharacter
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