Yzma is a character from ENG, KNG and ENS, known for her terrible ugliness (see the picture) and owner of a secret lab. She is the main antagonist and Kuzco's enemy. Their conflict started when Kuzco fired Yzma in the movie because she was taking the throne when he wasn't looking. Since this happened, Yzma is thirsty for revenge. Her only possible friend is Kronk, who works for Yzma in the movie and the series (despite Kronk is a kind person). Yzma's focus on life is defeat Kuzco and become Empress of the Incas. For that reason, she tried to poison Kuzco in the movie, but accidentaly transformed him in llama (because of Kronk's mistake). Also, during the series, she assumed the identity of "Ms. Amzy" and became director of Kuzco Academy. So, she begun to always make attempts to defeat Kuzco in a new way: Make him fail in the school. This would cause Kuzco to not get the power, and Yzma was the only option left, so, they would need to put her in the throne and she would become Empress.