The devilish Iru is the first of Utau's two Character Guardians introduced in the story. Iru is mean and unkind, but dislikes nagging. During Character Transformation, Utau becomes Lunatic Charm, with the attack Nightmare Lorelei and later, Dueling Trident. When Iru felt lonely because Eru wasn't there for her to tease and when she felt that Utau was ignoring her because of Diamond, she Character Transforms with Amu, becoming Amulet Devil. In the anime television series, Iru is voiced by Hiromi Konno.