Nightmare Bitters Edit
- Main Article: Nightmare Bitters
- Nightmare Bitters is the Nightmare version of Miss Bitters, and seemed to be the ultimate authority in the Nightmare Realm.
Nightmare Dib Edit
- Main Article: Nightmare Dib
- The Nightmare version of Dib. He was locked in the Nightmare Version of the Crazy House for Boys, and has a lobotomy scar on a head that's even bigger than that of his "real-world" counterpart. For most of his time onscreen, he remained in the darkness, only revealing his face once.
Nightmare Membrane Edit
- Main Article: Nightmare Membrane
- Nightmare Membrane is the Nightmare version of Professor Membrane. Dib encountered him in the Nightmare Version of his own house, along with Nightmare Gaz.
Nightmare Gaz Edit
- Main Article: Nightmare Gaz
- Nightmare Gaz is the Nightmare version of Gaz, and was seen in Dib's Nightmare House, whilst drinking "Dark Poop" soda.
Nightmare White Coats Edit
- Main Article: Nightmare White Coats
- Nightmare White Coats were the Nightmare Versions of the White Coats, who work worked in the Crazy House for Boys.
Nightmare Nny Edit
- Main Article: Nightmare Nny
- Nightmare Nny is a Nightmare version of the real Johnny C and due to his appearance in the Nightmare realm, it can be implied that Dib and Nny met off-screen.
Nightmare Keef Edit
- Main Article: Keef
- Exactly the same as normal Keef. "He was already scary enough to begin with" - Jhonen Vasquez
Minor Halloweenies Edit
Hummelflesh, Destroyer of Worlds Edit
- Main Article: Hummelflesh, Destroyer of Worlds
- He seemed to be the leader of the Halloweenies (after Nightmare Bitters) until he failed in bringing Dib to Nightmare Bitters.
- Main Article: Yolk
- He was the Halloweenie who was sent by Nightmare Bitters to capture Dib after Hummelflesh failed.
The Enigma Edit
- Main Articles: The Enigma
- He was the Halloweenie who attempted to reassure Nightmare Bitters when she felt stupid after saying "Let the head... thingy... start!"
Stock Halloweenies Edit
Other Halloweenies are:
- The Admiral
- Bobby Joe Ray Billy Sue
- Bride of Mortïs
- Cage Monster
- Dancing Skeletons
- Gordon Peterson and Gordon Peterson Jr.
- Mr. Pinchy
- Puncher of Heads
- Simon Rikkis