The Gromble

The Gromble is the main antagonist of the popular cartoon Aaahh!!! Real Monsters and although technically the headmaster of the school in which the main protagonists attend he is nevertheless the one most often responsible for making their lives miserable.

The Gromble is a very mean-spirited monster and a bit of a bully, taking delight in torturing his students both through physical and psychological abuse - though he seems to believe that his methods are justified as he leaves most of his truly wicked abuse for those who perform poorly at their "scare tactics".