"Pacha, the peasant llama herder, was not a heavyset middle-aged married man but a carefree, good-hearted 18-year-old who was a dead ringer for Emperor Manco. (In the final version, the character is renamed Kuzco following Fullmer's horrified discovery of the Japanese slang term "omanco" that politely translates into the word "vagina.") A young Owen Wilson provides the voice for Pacha.
Sting wrote "Walk the Llama Llama" that Pacha was to sing as he led his trio of llamas down the mountainside and into the marketplace. There was concern that Hartley's clever lyrics were too sophisticated for an unsophisticated peasant boy who would never use words and phrases like "panorama" and "the perfect fashion statement."
Manco (voiced by David Spade) had grown bored with being ruler of his mountain kingdom so when he discovers the kindly llama herder who is his doppelganger, he decides to get away from his duties of state by switching places. Unfortunately, a sorceress named Yzma who has her own agenda turns Manco into a llama who cannot talk so Pacha must continue the masquerade.
The situation becomes more complicated when Manco's betroved, the handmaiden Nina, finds the arrogant and haughty emperor is now kind and funny. She finds herself drawn to the seemingly transformed emperor. Pacha also finds himself falling in love with Nina even though she is promised to the emperor.
Sting wrote "One Day She'll Love Me" that was to appear midway through the movie where Pacha and Nina are at a party at the palace and the two teens fight their growing attraction to one another.
Yzma had once been an incredible beauty in the Incan royal court. However, time and the sun have cruelly robbed her of her good looks. Yzma begins dabbling in the dark arts in an attempt to revive her beauty although she firmly believes it is the sun that has robbed her of her beauty.
She wants to snuff out all light on earth by unleashing the demon, Supai who is a force of darkness, to block out the sun. In a world locked in perpetual darkness, Yzma feels that her great beauty will finally be restored."