- "Amy, I can hurt you and your family in a hundred ways."
The Big Bad of the "Night Of The Living Dummy" series of books and currently the one reoccurring character to appear in the most books.
- Adaptation Dye-Job: Is a redhead in the TV series, unlike the books where his hair was dark brown.
- Adaptational Heroism: Especially in the second movie. He was genuinely helpful to Sonny and Sam and did seem to really want to be a part of the family. He only hurt bad people who hurt them (Tommy) or made Sarah upset (Tyler). He was completely nice to them until Sarah tried to get them to turn him off. Even when he's bringing Halloween to life he's still way more sympathetic and even still seems to consider them his family. He's also a considerably nicer boss to Walter compared to how his book and especially TV counterpart treat their minions.
- Adaptational Badass: Is far more competent and powerful in The Movie than he ever was in the books.
- Advertised Extra: Features prominently on the cover for Night of the Living Dummy, despite his appearances being cameos until the very end and Mr. Wood being the main antagonist.
- Affably Evil: In the second movie, even when he starts bringing Halloween to life, he's still kind to the Quinn family and considers them his family.
- Ambigious Situation: At the end of the first book when he comes alive and grabs Kris asking is "that other guy gone." If Slappy came alive after Mr Woods spirit was destroyed and became evil or if he was alive the whole time and was nice at first before turning evil due tot he spirit is unknown. The author interview says Mr Woods death made Slappy twice as evil and since nobody read the words when he was around it implied he was a nice dummy before Mr. Wood died. "I Am Slappy's Evil Twin" seems to show that he and Snappy are not hostile towards their creator unlike Mr. Wood.
- Anti-Hero: In "Slappy's Nightmare", "The Streets of Panic Park" and "The Dummy Meets the Mummy"
- Ascended Extra: Didn't come to life (or at least didn't show he was alive due to being non-hostile) until the very end of Night of the Living Dummy, after the heroes destroyed the main antagonist, Mr. Wood. The sequels obviously focus on Slappy, though he occasionally shares the spotlight with other dummies.
- The Bad Guy Wins: The only times he's able to get a leg up on the protagonist in the end are in Son of Slappy and The Ghost of Slappy.
- Big Bad: Of his mini-series and both of the movies. Could be conisdered this of the franchise as a whole as he appears the most more than any other villain.
- Big Bad Wannabe: He may be the face of the franchise, but Slappy is actually a small fry compared to other, more powerful antagonists. His plans are usually thwarted by other dummies, and in the "Horrorland" series, he's just another minion of the Menace. Averted in The Movie; the other monsters obey him without question because he released them from their books.
- Bad Boss: The way he treats his intended "slaves" should say enough, but he also acts this way to Rocky. Subverted in the second movie.
- Benovelent Boss: Towards Walter in the second movie.
- Berserk Button: From The Movie: don't call him a dummy. It has also started cropping up in the Slappyworld books.
- Breakout Villain: Arguably the most well known villain of the series. He is also the main Big Bad in The Movie.
- Demonic Dummy: Well, obviously
- Demonic Possession: Happens at the end of Bride Of The Living Dummy, and possibly at the end of the TV adaptation of Night Of The Living Dummy III.
- Determinator: His owners are always in for a surprise when they try to get rid of him.
- The Dreaded: In the movie, it quickly becomes clear that Stine — who comes across as a pretty scary person himself — is scared of him in a way that he doesn't see his other creations.
- Enemy Mine: In "The Streets of Panic Park" and "The Dummy meets the Mummy" where he teams up the main characters against eviler threats (The Meance and Arragotus respectively).
- Evil Redhead: Only in the TV show. He's a brunette in the books and The Movie.
- Eviler Than Thou: Meets one in Slappy's Nightmare, another ventriloquist dummy trying to take his place. This is also the case in "Bride of the Living Dummy" and "The Streets of Panic Park" The Dummy Meets The Mummy!, with the titular mummy.
- Expy: Of Chucky from Child's Play.
- Failure Is the Only Option: His goal is to find human slaves, which he has made no progress with since his first appearance even if he doesn't exactly lose by the end of the book. Finally averted in Goosebumps Most Wanted: Son of Slappy. After Jackson spends the entire book trying to fight off Slappy's hypnotic control, he defeats Slappy and hides him... only for his bratty sister, Rachel, to find Slappy, team up with him, and they ''both'' end up controlling him and making him do terrible things. The reason? Because Rachel was tired of her "perfect brother" making her look bad. Also averted in Ghost of Slappy.
- Flash Step: Gains this in the movie, able to move incredibly fast between flashes.
- For the Evulz: Besides getting "slaves", this is pretty much his only motivation. He even says "Evil is its own reward" in Son of Slappy.
- Somewhat averted in The Movie, as while a lot of his mayhem is still For the Evulz, his biggest motivation is to kill Stine for keeping him trapped in his book and trying to put him back. The rest is just icing on the evil cake.
- Once again subverted in the second movie, where he only wants to have a family of his own and a "mother".
- From Nobody to Nightmare: It's heavily implied Slappy was alive all along but was a friendly dummy in his first apperance. After Mr Wood died he changed and became the biggest villain of the franchise.
- Hate Sink: Despite Slappy's Breakout Villain status, he really doesn't have many charming, funny, or impressive qualities, coming more as a smug, callous bully who thinks he's way cooler than he actually is. His sense of humour is tasteless, he makes life miserable for everyone around him (sometimes to the point where his few allies turn on him), and pathetically begs when his enemies gain the upper hand. What's more, he doesn't even have Blue and Orange Morality as an excuse, since Slappy's Nightmare reveals he apparently has a human soul. Subverted In the second movie.
- I Have You Now, My Pretty: His interactions with his female owners are pretty disturbing to read as an adult.
- Iconic Sequel Character: While he did appear in the first Night of the Living Dummy book, Mr. Wood was the main antagonist—the fact that Slappy is also alive was just the Twist Ending. He would go on to be the Big Bad of the whole series, though, while Mr. Wood only merited a mention in Slappy's origin story.
- Jerkass: He mocks people incessantly, smacks them around and threatens to kill them when they defy him, commits petty acts of vandalism and mischief, and enjoys turning friends and relatives against each other.
- Jerkass Ball: He usually just insults or beats up the kid he meets but never attempts to murder them. But in "Slappy New Year!" he tries to murder a kid with garden clippers.
- Joker Immunity: Gets destroyed (or at least disposed of) at the end of most books, yet always returns for another sequel. Lampshaded in the second movie.
- Karma Houdini: Even if he doesn't win there are books where he does not entirely lose. In his first appearance the book ends with him grabbing Kris and asking if the other guy is gone. Or in "Night of the Living Dummy 3" where the main character gives him to her cousin at the end of the book and he ends up winking at her.
- Kick the Dog: Constantly. One notable example is in Night Of The Living Dummy 2 where he crushes a little girl's hand until it's all red and swollen.
- Laughably Evil: He's still a prick, but he's much more playful and mischievous than outright sadistic.
- Lesser of Two Evils: Many times such as "Bride of the Living Dummy", "Slappy's Nightmare" and "Streets of Panic Park" but best example is in "The Dummy Meets the Mummy!". Slappy only wants to enslave the main characters wile Arragotus wants to outright kill them. This is why the kids bring Slappy to life so he can fight the mummy, which he does and he does help them, but not for noble reasons.
- Nominal Hero: In "The Streets of Panic Park" where he helps the main characters defeat The Meance only so that he and the other villains don't become slaves to the Meance as well.
Slappy: Don't worry, everyone! Don't worry! I'm going to save you kids—save you for ME! Hahahaha!
- In The Dummy Meets the Mummy! The protagonists bring Slappy back to life in the ill-conceived belief that he can help them against the rampaging Arragotus. Slappy initially doesn't care about the mummy, but when Arragotus attacks him, the two get into a fight, with Slappy being the lesser evil (sort of, he wants to enslave everyone, whereas Arragotus just wants to kill everyone). Slappy, strangely enough, does actually try to to defeat Arragotus and does not betray the kids at least until the Mummy is defeated. That being said e doesn't mind not helping them with the bugs he brought alive attack the kids.
- Pick on Someone Your Own Size: While Slappy is at least hundreds of years old and his victims are usually 12 years old, by default he is still tormenting people 20 feet taller than him.
- Pintsized Powerhouse: Despite being a small wooden dummy, he's considerably strong and can hold his own against people twice his size.
- Politically Incorrect Villain: Besides being a raging misogynist, he also mocks people's weight and age. At least he avoids racism and homophobia.
- They Killed Kenny Again: No matter how many times Slappy gets destroyed, he always comes back in the next story inexplicably repaired.
- Villain Protagonist: Zigs the line between this and a Nominal Hero in Slappy's Nightmare which is told from his perspective. Stine makes him slightly more sympathetic by pairing him with an even worse antagonist.
- We Used to Be Friends: With R. L. Stine in The Movie.
- Weak, but Skilled: Being a ventriloquist's doll, he's not much of a physical threat, but Slappy knows how to take advantage of his seemingly innocent state to cause chaos and turn people at each other's throats. This, coupled with his mean fighting style, durability, and ability to somehow rebuild his body when broken makes him more of a force than he has any right to be.
- Would Hurt a Child: Even someone like a preschooler.
Kris and Lindy Powell
The original protagonists of the Night of the Living Dummy series, two twin sisters who share a rather intense sibling rivalry that gets enflamed when Lindy finds Slappy abandoned in a nearby dumpster and gains newfound popularity with her ventriloquist act.
- Anything You Can Do, I Can Do Better: Pretty much their rivalry in a nutshell. Seemingly the main reason Kris wants a dummy of her own is to show up Lindy.
- Aw, Look! They Really Do Love Each Other: Are borderline antagonistic to each other for much of the novel but show genuine concern for each other's well being and team up when Mr. Wood is shown to be very much alive and terrorizes them both.
- Bait-and-Switch: At first seems like the Big Reveal is Lindy was the "villain" all along after it's revealed she was behind all of Mr. Wood's strange behavior... until Kris reads aloud an odd phrase tucked into Mr. Wood's pocket that actually brings him to life and leads to the dummy's genuine reign of terror.
- Big Sister Bully: It's never stated who's the older twin but Lindy seems to take on this role to a milder degree, mostly just coming across as a bit overly smug, patronizing and bossy... until it's revealed she was Gaslighting Kris into thinking Mr. Wood was actually alive and creating escalating levels of mischief simply out of spite that Kris was sharing her newfound passion.
- Break the Cutie: It's pretty much one continuous Trauma Conga Line for Kris, a mold-setter for much of the series later protagonists.
- Cannot Tell a Joke: Kris struggles to find a funny routine to use with Mr. Wood.
- The Glorious War of Sisterly Rivalry: Probably the most intense in the entire series, which makes sense as they're sisters who share nearly everything (including their room), which only gets exacerbated when they both get dummies and sinister trouble starts to brew.
- Green-Eyed Monster: Kris's jealousy starts growing after seeing how much attention and praise Lindy gets with her and Slappy's ventriloquism act.
- Here We Go Again!: After finally getting rid of Mr. Wood for good they return to their room only to find a relieved Slappy is also very much alive (as well as also seeing them as his "slaves").
- Kick the Dog: Hoo boy.. Lindy's whole "Joke" with the dummy, as it was clearly NOT meant to be funny (other than maybe to her) and scaring the shit out of your sister until she breaks down crying is abusive by any meaningful definition.
- Laser-Guided Karma: One could say to Lindy when Mr. Wood actually does come to life and torments the family, though Kris gets all the blame.
- Long Hair Is Feminine: Subverted, as the short-haired Kris is the much more feminine of the two.
- Sanity Slippage: What Kris's parents begin to expect of her after Mr. Wood's nasty stunt at the auditorium.
- Trauma Conga Line: Kris. Not only does she get tricked into thinking Slappy is alive in a cruel "prank" by Lindy (which reduces her to tears by the end and makes her question her sanity), she later has to deal with Mr.Wood coming alive and tormenting her and Lindy. And at even at the end when they kill Mr.Wood, Slappy then comes alive for real to try to enslave them poor girl..
- Troubling Unchildlike Behavior: Lindy shows some potentially alarming signs of this when it's found out she was Gaslighting Kris into thinking Mr. Wood was actually alive, much of of which included outright verbal and physical abuse through the conduit of the dummy itself as well as destroying all the family groceries and other property as part of the extended "prank", and shows little remorse or regret when Kris reveals how much it genuinely scared and upset her).
- The Unfavorite: Not as blatant as most examples, but it's more than hinted at Kris lives a bit in Lindy's shadow.
- Villain Ball: Lindy seems to get it when she plays her terrifying "prank" on Kris as while she's not exactly nice to her sister for the most part, nothing else she does is anywhere near as mean.
The original living dummy from early in the series. Mr. Wood was given to Kris after her sister Lindy found Slappy, and he was the one who initially came to life and tormented the girls. He was killed off in the book's ending and hasn't appeared since in any of the other books.
- Adapted Out: Was never featured in the TV adaptation.
- Ax-Crazy: The trading card depicts a scene of him lunging at Kris, tackling her down a flight of stairs while also trying to strangle her.
- Demoted to Extra: His only other appearances in the franchise beyond Night of the Living Dummy were in the trading card series and as the player character for the Horrorland website's games, as well as a cameo in I Am Slappy's Evil Twin
- Evil Redhead: Has a mop of red hair.
- Flat Character: He's a more vicious version of Slappy who loves tormenting his owners. That's pretty much all we know about him, and given his demise, it's likely all we ever will.
- Jerkass: He makes Slappy look pleasant by comparison. Let that sink in.
- Knight of Cerebus: An unusual example in that he came before his more comical brother. While Slappy is more of a trickster, Wood is outright homicidal and revels in how much intimidation and suffering he can inflict on his owners. At one point, he even tries to murder the family dog, and threatens to go after Kris and Lindy's parents next.
- Killed Off for Real: And unlike Slappy he really has stayed true to this trope when he died at the end.
- Posthumous Character: Slappy's Nightmare has him haunt Slappy's dreams and try to sabotage his brother's attempts to be good. He's not really back, of course, but this implies his influence still looms over his brother. Bonus material in the Goosebumps Classics reissue of Night of the Living Dummy also supports this, as it notes that Mr. Wood's destruction made Slappy twice as evil and a thousand times ruder.
- Politically Incorrect Villain: While usually a lot more serious and threatening than Slappy, his insults he frames Kris for during her ventriloquism act are beyond cruel, possibly coming as offensive as possible with breaching the guidelines of children's literature.
- Predecessor Villain: Not only did he come before Slappy, but it's implied that his malice and evil energy is what made the creep what he is today.
- Small Name, Big Ego: Judging by all his spiel about powers and other threats, Wood seems to think he's bigger than he appears. Fittingly, he's crushed like a peanut by a steamroller and the world doesn't give a shit.
- Stupid Evil: Before he came to life proper, Lindy adored him and might have been easier to manipulate if he acted nicer. Instead he bullies, blackmails, and wrecks havoc, which only draws attention to himself, to the point where her parents decide to take him back to the store next Monday. He then continues to be a controlling little bastard, and it leads to his deservingly pathetic demise.
- Starter Villain: Of the Night of the Living Dummy books.
- Undignified Death: Gets randomly squashed by a steamroller, whose driver initially mistakes him for a little kid. Then his remains are swept up and forgotten by the rest of the series. Can't say he didn't earn it.
- We Hardly Knew Ye: Cracked like an egg in his first appearance.
- "Anyway, I'm the one with the most problems on Family Sharing Night. Because I'm not really talented the way Sara is. And I'm not a total goof like Jed. So I never really know what to share."
The protagonist of Night of the Living Dummy II. Amy is the middle child of the Kramer family and never seems sure on what exactly she wants to share on Family Sharing Night. She is also an avid ventriloquist who often uses her old dummy, Dennis, for her act, only for the latter's head to pop off every time she performs with him. So she ends up with Slappy instead, who caused mischief for Amy and gets her in trouble with her family, who believes that their middle child has totally lost it.
- Aw, Look! They Really Do Love Each Other: She's jealous and bitter towards her sister for most of the book, but they hug when Sara admits she was also jealous of her.
- Break the Cutie: This happens to her when her family begins to blame her for Slappy's mischief.
- Brilliant, but Lazy: Her teacher writes on her report card that she's smart but doesn't work to the best of her ability, and she talks to her friend on the phone when she's supposed to be doing homework. She also helps formulate a plan to defeat Slappy and convince her parents of his existence.
- Butt-Monkey: And how! Starts out as The Unfavorite of her family, subject to constant abuse from her siblings, poor grades in school, and her dummy Dennis' head falling off constantly. Then when Slappy is brought intot he picture, she gets framed for many terrible things, like insulting the family during her ventriloquism act, commiting horrifying acts of vandalism in Sara's room, and having Slappy break a three year old girl's hand. By the third act, her family starts treating her with aloofness and are prepared to send her to a child therapist. Not to mention how, in the tv adaptation, Slappy destroys her friendship with Margo.
- Cannot Tell a Joke: Downplayed. As shown in the beginning of the book, Amy is not very good at telling more creative jokes. She does, however, at least come up with more simplistic "knock knock" jokes to entertain the younger children.
- Cassandra Truth: Right when Amy tells her family that Slappy is responsible for the vandalism in Sara's room, no one believes her, and her parents admonish her for blaming the dummy for the mischief they blindly think she's committed. As a result, they punish her and even consider getting her help, as they instantly believe she's gone nuts. It isn't until Sara tells Amy that she knew this whole time Slappy was alive and was able to convince Mr. and Mrs. Kramer this fact when they finally witnessed Slappy walking on his own in the end.
- Clear My Name: Amy constantly gets blamed for vandalizing her sister's bedroom and tries to convince her family that Slappy did it. They don't believe her until the end of the story.
- Dismissing a Compliment: When her dad praises her stories on Family Sharing Night and says she's going to grow up to be a famous writer, she assumes he's just saying it to be a good parent, as Sara is the really talented one in the family.
- Don't You Dare Pity Me!: She has this reaction towards Sara when the latter tries to comfort her after Amy started crying over the butchered party thanks to Slappy.
- The Glorious War of Sisterly Rivalry: Downplayed. Amy doesn't really have much of a rivalry with Sara as much as she's just simply envious of her. Mutually, Sara shares Amy's envy towards her as well for different reasons. Amy is the more popular sister while Sara is the more studious, smart one.
- Green-Eyed Monster: Amy is very jealous of Sara's talent at art, as well as her perfect report card. It later becomes inverted when she learns that Sara was also jealous of Amy due to Amy having a sense of humor, something Sara makes up for lacking with her artistic talent.
- I Just Want to Be Special: Being The Unfavorite of the family, Amy wishes she had something special to show for Family Sharing Night.
- Inelegant Blubbering: She does this twice, once when her mother accused her of vandalizing Sara's room and the second time when Slappy squeezed and injured a three-year-old's hand.
- Made a Slave: Or at least that's what Slappy tried to do to her.
- Middle Child Syndrome: Amy feels this way. She isn't as talented as her older sister or even funny like her younger brother.
- Ms. Vice Girl: Again, she's a nice girl who just happens to have a jealousy problem.
- Mutual Envy: Amy is shocked to discover that Sara was also jealous of her as well.
- Nice Girl: Envy aside, she's still a kind, well-mannered girl.
- The Storyteller: She shares her stories on Family Sharing Night. Her parents assume she's just creating new ones when she keeps swearing Slappy's alive.
- The Unfavorite: She hardly receives any support for anything she shares at Family Sharing Night, such as her music collection since no one in her family shares her taste in music.
- Ventriloquism: Well, this is the case with all the NOTLD books, really, but Amy has taken this even before Slappy came around, with her original dummy, Dennis.
Sara and Jed Kramer
Amy's older sister and younger brother in Night of the Living Dummy II. The former is a talented painter while the latter is an obnoxious prankster.
- The Ace: Sara is an amazing painter as well as doing good in her studies and getting perfect report cards.
- Aloof Big Sister: Sara mostly just focuses on her paintings and is rather distant towards Amy and Jed.
- Annoying Younger Sibling: Jed due to his love of pranks, though more towards Amy. Sara doesn't seem to mind him too much, that is unless he tampers with her paintings.
- Aw, Look! They Really Do Love Each Other: Sara is rather distant towards her sister for most of the book and lets the family think she's crazy when Sara knows Slappy is alive, but also is the first to hug her when she tells her about Slappy.
- The Baby of the Bunch: Jed thinks he's cute and can get away with being annoying because he's the youngest.
- Brainy Brunette: Sara is described as having straight black hair and is a straight-A student.
- Bratty Half-Pint: Amy says that she sometimes spells Jed B-R-A-T.
- Broken Ace: Sara becomes this when she tells Amy that she relies on her talent to hide her own jealousy towards her.
- Cool Big Sis: Sara becomes this towards Amy after admitting she knows that Slappy is alive and helping Amy get rid of the dummy.
- Disproportionate Retribution: Jed's reason for pranking Amy by putting her dummy's head on her window was that she didn't stick up for him after ruining Sara's painting.
- Foolish Sibling, Responsible Sibling: Jed is the foolish, less serious one who enjoys playing practical jokes to Sara's more responsible, diligent attitude who often takes her work of art very seriously.
- The Glorious War of Sisterly Rivalry: Downplayed. Aside from the fact that Sara herself isn't aware of Amy's jealousy towards her, she's never really saw her relationship with Amy as a rivalry as much as she was just simply jealous of Amy's sense of humor. Sara is the more smart and serious sister while Amy is more popular due to her natural sense of humor.
- Green-Eyed Monster: Part of the reason Sara didn't speak up when she knew Amy was being tormented by Slappy was because she was jealous of her due to her natural sense of humor and because she was better at making friends than her, while Sara had to focus on painting to get attention.
- Insufferable Genius: Sara shows off her perfect report card to the family and is very serious about her paintings, even causing Amy to lose sympathy for her when she calls one of them a "work of art" after Jed ruins it.
- Jabba Table Manners: Jed really has no manners at the dinner table, as one chapter has him opening his mouth wide enough to show Amy his chewed-up food, covering himself with spaghetti sauce, and sticking carrots up his nose to emulate a walrus.
- Jerkass: Jed, who is an obnoxious prankster who proceeds to share gross things such as loud belches during Family Sharing Night and would even go as far to butcher Sara's painting she worked real hard on out of spite while casually shrugging it off like it was no big deal.
- Mutual Envy: Sara towards Amy, as the latter was jealous of the former's talent of art and perfect GPA while the former was jealous of the latter's sense of humor.
- Nice Mean And Inbetween: Of the three siblings: Amy is the nicest (even if she's not without her faults.) Jed is the mean, being an obnoxious brat who defaces Sara's painting and decided once to humiliate Amy by reading a personal note she got from a guy. With Sara as the in-between, as while she's a nice enough person (and tries to comfort Amy when she's really upset at one point) she is kind of stuck up and is secretly jealous of Amy for being "normal" and not having to work hard to impress everyone all the time.
- Not Me This Time: After Sara's room is vandalized, the family shifts the blame towards Jed, who protests he didn't do the damage and points fingers at Amy, who is instantly given the blame instead.
- The Perfectionist: Sara is this in regards to her paintings, being distraught when Jed ruins one.
- The Prankster: Jed often shares his pranks in Family Sharing Night.
- Smarter Than You Look: Despite being the family goof-off, Jed apparently does well in school, even managing to get a much better report card than Amy.
- Stepford Smiler: Sara, who needs to paint to impress everyone since she's jealous that Amy has it much easier than her.
- Youthful Freckles: Jed is the only family member who has these.
Amy's dummy, who is falling apart. He's just an ordinary dummy with no special powers. Or is he?
- Ambiguously Evil: He somehow becomes a living dummy himself at the end, but it's implied that he does so to save Amy from Slappy. It's never made clear if he did this for her sake or just to get rid of Slappy.
- Ambiguous Situation: In the book, it's only implied that he came to life and defeated Slappy. In the episode, it's made explicit.
- Good Counterpart: Provided he isn't actually a villain, he's likely this to Slappy.
- Undying Loyalty: Possibly to Amy, which he proves by essentially bringing himself to life through sheer willpower to save her from Slappy. It's not clear if this was out of genuine loyalty or if he just wanted Slappy out of the picture.
- Walking Spoiler: He's hiding a secret of his own...
Trina and Dan O'Dell
The protagonists of Night of the Living Dummy III, two siblings with a father with an interest in ventriloquism who acquires a certain dummy, around the same time as their cousin comes to visit them.
- Age Lift: Trina says she's twelve in the book, but is portrayed by then seventeen-year old Erica Fairfield in the tv adaptation.
- Crying Wolf: Their parents assume they're pranking Zane with the dummies due to their past behavior, no matter how much they deny it. It turns out it was actually Zane himself doing so to get them in trouble.
- Disproportionate Retribution: Trina gives Zane Slappy when he asks for a ventriloquist dummy as payback for him getting her and Dan grounded for the summer.
- Embarrassing Nickname: Trina occasionally calls Dan "Mouse".
- Significant Green-Eyed Redhead: Trina has red hair and green eyes and is the protagonist.
Trina and Dan's wimpy cousin.
- Butt-Monkey: His skittish, easily scared persona makes him an easy target for pranks and teasing from his cousins, who go out of their way to scare him whenever he visits.
- Camera Fiend: He takes up an interest in photography when visiting Trina and Dan, even forcing his cousins to stay indoors to help him find the exact angle to take photos.
- Deathby Adaptation: In the "Bride of the Living Dummy" TV show his dummy head is seen with Slappy's rivals that he destroyed.
- The Dog Bites Back: He decides to mess around with Trina and Dan using the dummies as payback for all the times they pranked him.
- Easily Forgiven: Aside from being momentarily angry, Trina and Dan very quickly forgive him and offer a truce when they learn that he was the one creating mischief with the dummies, even conceding that they probably deserved it for all the times they pranked him.
- Laser-Guided Karma: When Trina gives him Slappy as a parting gift after he tattles to their parents and gets them grounded for the summer.
- Puppet Permutation: Gets turned into a dummy himself by Slappy in the tv adaptation.
- The Stool Pigeon: He rats Trina and Dan out to their parents after assuming they were planning a trick involving the dummies.
A doll owned by Jillian's little sisters, who take her everywhere they go but seem to be afraid of her and are always claiming that she does bad things. It turns out she's really alive and forces the girls to do things for her. And now she wants Slappy for a husband.
- Abhorrent Admirer: Slappy prefers Jillian as a bride, but she's insistent he pick her.
- Creepy Doll: She plays it straighter than Slappy in that she's an actual doll, not a dummy.
- Disproportionate Retribution: She reacts to Jillian disliking and resenting her by terrorizing her family.
- Eviler Than Thou: She's somehow even worse than Slappy in that she's been more successful in controlling young kids to do her bidding. Katie and Amanda are terrified of her, and in the TV show Katie explicitly tells Jillian that Mary-Ellen has threatened to kill her family if she didn't do what she wants.
- Expy: Of Tiffany from Bride of Chucky. She even sounds like her.
- Unholy Matrimony: What she wants with Slappy, but he's not interested.
- Woman Scorned: When she finds out Slappy wants Jillian for his bride, she flips out and tries to kill him. What makes her especially mad, in the book at least, is that she was the one who revived him in the first place.
Britney Crosby's annoying younger cousin who comes to visit her, and brings a certain dummy with him.
- Bratty Half-Pint: He incessantly pesters and kicks Britney and her friend Molly.
- Clashing Cousins: He fights with Britney constantly. In fact, she mentions that last time he came to visit, they got into a fistfight.
- Parental Neglect: His parents were sick for a long time and couldn't take care of him, which is implied to be the reason for his misbehavior.
- Spoiled Brat: Britney's parents let him get away with all of his misbehavior while blaming Britney for his actions because they feel bad about his absent parents.
- Troubling Unchildlike Behavior: When it's revealed he was using a remote to control Slappy's actions, which included insulting and physically assaulting people, damaging his cousin's property, and even pushing her down the stairs and almost seriously injuring her at one point.
- "It's a lot easier to be good than bad."
The protagonist of Son of Slappy. Jackson finds Slappy in his possession, only for Slappy to then start possessing him.
- The Ace: He's a near perfect kid, much to his sister's annoyance.
- Demonic Possession: Slappy starts controlling his actions and making him act out.
- Foolish Sibling, Responsible Sibling: He's much more mature and well-behaved than his sister Rachel, who his parents call a problem child.
- Nice Guy: He tries his hardest to be this.
- O.O.C. Is Serious Business: His parents and teachers are shocked when Slappy makes him start committing bad deeds and insulting them, since he's such a good kid.
- Parental Favoritism: His parents clearly prefer his studious, mature nature over his more disobedient and aggressive sister.
The protagonist of the story, a boy whose life is turned upside down when he receives Slappy as a birthday present.
- Abusive Parents: His parents do nothing to stop his cousins bullying him and his father's idea of a "fun" birthday surprise is to hire actors to scare Ian.
- Be Careful What You Wish For: He's always wanted a ventriloquist dummy. Unfortunately, he gets Slappy.
- A Birthday, Not a Break: His birthday is the start of everything going wrong for him.
- The Chew Toy: He is often on the receiving end of physical abuse including his cousins choking him, getting a nosebleed when they smack him in the face, and being shoved through a glass fishtank by his sister.
- Clashing Cousins: His cousins delight in beating him up and lying to get him in trouble. He initially doesn't realize how dangerous Slappy is because he assumes his cousins are behind it as usual.
- Dangerous 16th Birthday: Or in this case, dangerous twelfth birthday (twelve being the default age of Goosebumps protagonists.)
- Only Sane Man: He's the only one who realizes that Slappy is responsible for everything; as well as being generally calmer than his cousins and sister.
- The Scapegoat: He's always blamed for any trouble his annoying cousins cause and, after receiving Slappy, that Slappy causes.
A doll given to Ian's sister.
- The Bad Guy Wins: She manages to put Slappy back to sleep with the right magic words then enslaves the protagonist and his family for her own ends.
- Creepy Doll: Molly is the only one who disagrees.
- Enemy Mine: Seemingly her attitude where Slappy is concerned.
- Greater-Scope Villain: She helps to defeat Slappy, only to immediately declare everyone her slaves.
- True Blue Femininity: She's a vintage doll that comes with a blue ballgown, probably considered a feminine color at the time she was made.
Snappy the Dummy
Slappy's twin brother, created by the same puppet maker. He's considerably nicer and wishes Slappy were as nice as him. Until it turns out that he was evil as well and was only pretending to be nice as a joke.
The protagonist, a nervous boy afraid of the ghost in his house.
- I See Dead People: He is the only person that can see Annalee.
- Kafka Komedy: No matter how hard he tries, nothing goes right for him and the entire universe seems to be against him. Even adults join in tormenting him.
- The Klutz: He's clumsy on top of his many other problems.
- Nerd Glasses: He and everyone in his family wear unflattering oversized glasses.
- Nervous Wreck: He is pretty much constantly in a state of fear and distress.
- Puppy Love: Has a crush on a classmate named Mary Jane.
- We Used to Be Friends: With Trevor until Shep accidentally broke Trevor's ankle while playing sports.
A ghost haunting the basement in Shep's home. He is the only person able to see her.
- Barred from the Afterlife: It turns out this is the case for her because she wasn't a good person when she was alive.
- Friendly Ghost: Played with. Shep thinks she wants to hurt him, but she was actually this trope - until she ultimately betrays him, annoyed that he refused to listen to her or help her.
- Icy Blue Eyes: According to Shep's description of her.
- Jacob Marley Apparel: She remains in the period clothing that she presumably died in.
- Mistreatment-Induced Betrayal: She is so offended by Shep running away from her all the time, that she tears up the magic words that put Slappy back to sleep, leaving Shep at the mercy of Slappy who Shep had just brought back to life.
- Not-So-Imaginary Friend: Others assume her to be Shep's imaginary friend, since he's the only one able to see her.
- Too Good for This Sinful Earth: Shep wonders if this was the case for her, since she obviously died when she was around his age. Subverted when it turns out that her spirit can't move on because she wasn't good.
- Unfinished Business: She is stuck as a ghost until she can do something good to redeem herself. Ultimately, she does manage to do something good - for Slappy.