Characters who appear only in the Goosebumps novel Night of the Living Dummy III. Tropes relating to Slappy can be found at Goosebumps: Night of the Living Dummy Saga.
Dan and Trina O'Dell
Portrayed By: Blair Slater and Erica Fairfield (TV)
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.
- Adaptation Dye-Job: Trina in the book has curly red hair, but has blonde hair in the television adaptation.
- 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.
Zane O'Dell
Portrayed By: Hayden Christensen (TV)
Trina and Dan's wimpy cousin.
- Adaptational Heroism: In the book, he's on bad terms with his cousins from start to finish, whereas in the TV series he befriends them and joins them in fighting back against Slappy.
- 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 Slappy destroyed heavily implying Slappy killed him.
- 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.
