Utau's first Guardian Character to appear is Il, a conflict-loving, devilish girl who dislikes peace. She becomes extremely bored in peaceful situations and once told El that a Guardian Character who doesn't even Character Transform is unnecessary. Shortly after, El left Utau, and Il grew so bored that she wished for El to return just so she could tease her. Il tends to be very rude, especially towards Yukari Sanjo, whom she called an old woman despite being in her 20s. Her and El's names are often pronounced as "Iru" and "Eru." The name "Il" also represents the last two letters of the word "devIL."
During Character Change with Il, bat wings sprout from Utau's back, allowing her singing to draw out X Eggs. However, the number of X Eggs she can extract is limited, and their owners must hear her sing live. This Character Change also enables Utau to fly and unleash a powerful wave of butterflies as an attack.
When Utau transforms with Il, she becomes the devilish character Lunatic Charm, representing the rougher and more cunning side of her personality. This transformation first appears in Episode 22 of the anime.
