Yzma

Yzma is a hideous old woman who wants to usurp the throne by murdering emperor Kuzco. She has a strong, but rather stupid henchman named Kronck. She appears in the Disney comedy The Emperors New Groove.

Her Plan
She originally planned to dispose of the emperor by turning him into a flea..."A harmless, little flea." Then she would put it in a box, put that in another box, mail it to herself, then smash it. But then she decides to poison him. This backfires when the potion meant to poison him was actually a potion that turns people into llamas.