Centaurs

Centaurs are made to have the upper body of a human and lower body half as a horse. They are Greek monsters that are mythical creatures often said to have been born of Ixion and Nephele. Another version, however, makes them children of a certain Centaurus, who mated with the Magnesian mares. Also, this Centaurus was either himself the son of Ixion and Nephele, but that is unknown. Like minotaurs and harpies, they are meant to be half/part human, part/half animal. This is different from werebeasts like werewolves and werecats who can transform traditionally, only not in the Monster High franchise.