Maledictus T. Maggot is the supervisor for the wizards, Bubonic and Tyrannia.
His appearance is similar to humanoid bug and hates it when wizards get his name wrong. His name is not Mr. Slug or Mr. Larva.
In the TV program, he would usually request a spell to be done by his least favorite wizards and punishes them when the spell does not remain permanent.
Mr. Maggot has different methods of travel, including stepping inside of his briefcase. In the TV program, he has a wife.
In the novel, he only visits on New Year's Eve. The wizards made a devilish deal in the past that gave them powers, but now they have to hold their end of the bargain.