Miss crone

Headmistress Crone with her cat Clawford.

 Headmistress Crone is the commander of Gravedale High. She has a prostechic hand made of iron, which implies she rules Gravedale High with an iron fist. Her grandfather founded Gravedale High School in order to give monsters a formal education, and the headmastership has been passed down through three generations. Her monster classifiation is unspecified. Although she resembles the Bride of Frankenstein, another monster teacher was shown to be based off her. Her relationship with Mr. Schneider is a relatively strong one, as she realized he was able to discipline the worst class in Gravedale, something none of the monsters were able to accomplish.