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".

Despite his bullying nature the Gromble is very learned and powerful, being one of the few monsters who can hear the Pool of Elders — the source of monster existence that is made of the very substance of fears (though Ickis can also do this, which is somewhat ironic considering Ickis is sweet-natured and lovable, a direct opposite of the cruel Gromble).

Although undoubtedly cruel and malicious it is worth noting the Gromble is actually doing his duty as a monster, seeking to train his students in the ways of scaring humans so that they may become "real" monsters. He is also capable of being pleasant towards those who do well in their tasks (for example he views Oblina as one of his best students and treats her accordingly).