To make reading easier, this page is split up in two sections:
Miscellaneous characters - Every character or group of characters that cannot readily be placed on the student or adult subpages.
Dead Fast cast - In addition to the above, there is a handful of characters that are fiction even in the fiction of Monster High. So far, they are all part of the Dead Fast cast.
All characters within a section are listed alphabetically.
As Monster High is about teenagers, obviously it has to reserve a spot for celebrities to idolize. To fill that spot, a number of celebrity backgrounders occasionally show up.
The Clouds are a trio of cloud-like figures that hang around Valentine and possibly live with him. For the most part, they act as his minions and partners-in-crime, but their compliance might be dependent on Valentine's powers.
The Tiki are a species of living wooden idols and the only indigenous inhabitants of Skull Shores.
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Dr. Igorable is a human former employer and current enemy of the comic book hero Dead Fast. Igorable hates naughty and icky stuff, which he considers zombies to be, and wishes to rid the world of them. He doesn't like it when Dead Fast misuses his name by calling him "Dr. Deplorable".