Non-canon one-shot characters who have only ever appeared within the Treehouse of Horror Halloween episodes. Each of them are listed in order of their respective episodes and segments.
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Treehouse of Horror I
The Haunted House
- Voiced by: Harry ShearerDebut: "Bad Dream House"
A haunted house the Simpsons buy, which tries to get them to kill one another.
- Driven to Suicide: After contemplating living with the Simpsons, it decides the better option is to implode itself.
- Sure, Let's Go with That: When trying to get Bart to kill the others, he woozily asks if the house is his conscience. It decides to go with this.
Serak the Preparer
- Voiced by: James Earl JonesDebut: "Hungry Are the Damned"
Serak the Preparer is a Rigellian cook and associate of Kang and Kodos, working in their spaceship's kitchen while the Simpson family stays with them.
- Broken Tears: After the Simpsons think Kang and Kodos were trying to kill and eat them.Serak: I slaved in the kitchen for days for you people!
- Chuck Cunningham Syndrome: Serak did not reappear with Kang and Kodos in any of their later roles, as one commentary notes, they couldn't afford James Earl Jones every Halloween special.
Treehouse of Horror II
Treehouse of Horror III
Shopkeeper
- Voiced by: Hank AzariaDebut: "Clown Without Pity"
The mysterious shopkeeper who sells Homer the Krusty the Clown doll.
Treehouse of Horror IV
Treehouse of Horror V
Treehouse of Horror VI
Treehouse of Horror VII
Hugo Simpson
- Voiced by: Nancy Cartwright
- Cain and Abel: Subverted twice over. He just wants to get back together with Bart, and then it turns out Bart was the evil twin all along.
- Jabba Table Manners: Him eating his bucket of fish heads is apparently very unnerving for Homer. When finally allowed out the attic, he tries eating a napkin.
- Remember the New Guy?: Being kept chained up in the attic and Homer and Marge refusing to acknowledge his very existence will do that.
- You're Insane!: Bart points it out, but Hugo's not concerned.
Treehouse of Horror VIII
Fox Censor
- Voiced by: Harry ShearerDebut: Pre-title sequence
- Death by Irony: He touts the then-new TV rating system, rating the show TV-G, only to get stabbed to death by the rating box. For each stab, the rating box increases to TV-PG, then to TV-14, then TV-MA, TV-21, and finally, TV-666. The last two ratings aren't real, of course; the actual episode rating was TV-PG.
- Impaled with Extreme Prejudice: He dies this way, stabbed to death by a sword by the rating box.
- Number of the Beast: Each time he gets stabbed by the rating box, the rating increases, and when he finally dies, it reaches 666.
Treehouse of Horror IX
Treehouse of Horror X
Treehouse of Horror XI
Wicked Witch
- Voiced by: Tress MacNeille
- Bitch in Sheep's Clothing: She's Obviously Evil, but Bart and Lisa still decide to trust their gut and go along with her. She immediately enslaves them.
- Hesitation Equals Dishonesty: Claims she has a boyfriend called George Cauldron, but the fact she hesitates and looks at her cauldron before saying so makes the kids dubious. However, George does show up after she's been killed.
- Kill It with Fire: Roasted alive by the Simpsons in her own oven.
- Would Hurt a Child: Enslaves Bart and Lisa, regularly subjecting Lisa to beatings and feeds Bart up so she can eat him. When Lisa stands up to her, she tries throwing her in the oven.
King Snorky
- Voiced by: Harry Shearer
- The Bad Guy Wins: He and all the dolphins beat mankind and exile them to the oceans.
- Bitch in Sheep's Clothing: Initially, Snorky seems like another mistreated animal. He turns out to be much worse.
- Fantastic Racism: Towards seals, and a more justified hatred of humans.
- Freudian Excuse: Even before being captured and forced to perform tricks for the people of Springfield, he hated living in the ocean; it's cold, wet and miserable.Snorky: Every morning I wake up phlegmy!
Lisa: Plus all that sewage we kept dumping on you.
Snorky: (gasp) That was you?! - Mean Boss: When one particularly stupid dolphin gets caught in a volleyball net, Snorky frees him, then smacks him across the face for being an idiot.
- You No Take Candle: Subverted, when he first speaks it's in this way. Then he clears his throat and starts talking far more eloquently.
Treehouse of Horror XII
Ultrahouse
- Voiced by: Pierce Brosnan, Matthew PerryDebut: "House Of Whacks"
- Fate Worse than Death: He regards getting his British Charm Unit removed as this. Afterward, the Simpsons hand him over to Patty and Selma, where he's forced to listen to their endless complaining about work.
- Murder the Hypotenuse: He gets infatuated with Marge and tries to kill Homer so that he can have her himself.
Gypsy
- Voiced by: Tress MacNeilleDebut: "Hex And The City"
Treehouse of Horror XIII
Treehouse of Horror XIV
Professor Frink, Sr.
- Voiced by: Jerry LewisDebut: "Frinkenstein"
- Meta Casting: Professor Frink is directly inspired by Lewis's portrayal of Professor Julius Kelp in The Nutty Professor (1963), so it makes perfect sense to have Lewis himself play Frink's father.
Treehouse of Horror XV
Treehouse of Horror XVI
Treehouse of Horror XVII
Treehouse of Horror XVIII
Treehouse of Horror XIX
Treehouse of Horror XX
Treehouse of Horror XXI
Treehouse of Horror XXII
Treehouse of Horror XXIII
Treehouse of Horror XXIV
Treehouse of Horror XXV
Treehouse of Horror XXVI
Treehouse of Horror XXVII
Rachel Cohen
- Voiced by: Sarah SilvermanDebut: "BFF R.I.P."
Lisa's imaginary friend turned alive and evil.
- Chekhov's Gunman: She may be the same imaginary Rachel as Lisa's imaginary friend in "Today, I Am A Clown".
- Not-So-Imaginary Friend
- Yandere: She murders Lisa's friends so that she'll be Lisa's only friend.
Treehouse of Horror XXVIII
Treehouse of Horror XXIX
Treehouse of Horror XXX
Thanksgiving of Horror
Treehouse of Horror XXXI
Treehouse of Horror XXXII
Treehouse of Horror Presents: Not It
Treehouse of Horror XXXIII
The Pookadook
- Voiced by: Julie Kavner (while possessing Marge)Debut: "The Pookadook"
A demon that possesses Marge and tries to force her to kill Maggie.
- Demonic Possession: It's an evil spirit that takes control of Marge's body.
- Expy: It's a parody of the titular villain from The Babadook.
- Offing the Offspring: The Pookadook tries to make Marge do this to Maggie. With the implication that it wants her to do in Bart and Lisa (and Homer) afterwards.
- Tome of Eldritch Lore: The Pookadook's book turns out to be very resilient to everything Marge tries to do, including ripping it up and burning it. The last one causes it to turn into smoke and possess Marge. It even has Offscreen Teleportation abilities when it hops from spot to spot on the bookshelf.
- Weaksauce Weakness: The Pookadook can easily be trapped in a regular vacuum.
Steve Johnson
- Voiced by: Hank AzariaDebut: "Death Tome"
A shinigami (death god) who encourages Lisa to use the Death Tome for mass murder.
- Aerith and Bob: He insists it's an exotic name though, since there were a few shinigami with the name Necroblivia (a little more on the nose for a death god) in his nursery cave.
- Deadpan Snarker: True to his inspiration, Steve Johnson is a very snarky shinigami.Steve: [after El Barto reveals he knows about Lisa using the Death Tome] Oh, I know I'll sleep easier once they catch this "super killer".
- Expy: He's a parody of Ryuk, the shinigami from Death Note.
- Tom the Dark Lord: The shinigami is named Steve Johnson. He tries to justify it by claiming Steve was a very exotic name back when he was born.
Treehouse of Horror XXXIV
