She has many classic zombie traits:
* Green skin: A hallmark of most zombies.
* Brains: While she's very intelligent, she literally carries her brain around in a jar!
* Slow and deliberate movements: Ghoulia is not as fast as some of the other Monster High ghouls.
* A craving for brains: Although in Ghoulia's case, it's more of an academic interest than a need to eat them.
While she's sometimes called a "zombie girl," that's just a shorthand way to describe her. She's a zombie through and through!