Ghoulia Yelps (vocal effects provided by ) is the bespectacled daughter of a couple and Cleo's and best friend. She is also a zombie. She has a pet baby blue owl named Sir Hoots-a-Lot. The smartest ghoul at Monster High, Ghoulia is a shy and bookish girl, but Cleo de Nile refuses to let her be the wallflower at a party. She can only speak in the zombie language (moans and groans) due to physical limitations that all zombies have. Ghoulia's social life has improved greatly since befriending Cleo. She is the shortest girl at Monster High. Part of this may be because as a zombie, she never stands up straight.
Ghoulia Yelps is a 2010-introduced and all-around character. She is a z and the smartest student at . Ghoulia used to be a wallflower until took her under her wing and helped her get out of her shell, being one of the few to enjoy Cleo's complete trust. Other than Cleo, Ghoulia particularly favors the company of other zombies, with and being her main zombie friends. When she's not studying, inventing, or experimenting, Ghoulia is most likely to be found enraptured by a comic book or writing and drawing her own. She is in particular a fan of and regularly cosplays as her OC, Ms. Dead Fast. As an expert on comic book culture, Ghoulia also writes for the and is the paper's default reporter. Her video game username is MHMissDeadFast.
Yelps, real name Dimwit, is a cheerful and wealthy 35-year-old businessman who ran the , a special wheel that rewarded adventurers with prizes every day. He describes himself as the richest, smartest and smallest goblin to ever live, and appears to have an obsession with spinning wheels and being punched. Due to this, most of the other goblins dislike him, and himself apparently despised him.