The Princess of Sweet Rhyme is a princess that was stuck in the Castle in the Air. She was freed by Milo after he passed through the Mountains of Ignorance. Her sister is The Princess of Pure Reason. She and her sister were adopted by King Azaz and the Mathemagician's father when they were infants. They were in the Castle in the Air when they couldn't help them with their argument. In the film, she is pink with a pony tail and has no face like the Terrible Trivium.