Virzoeve Eclairouer, known as Viro, presents as a young girl with long purple hair, blue eyes, and large glasses. She deliberately acts clumsy and air-headed, a facade enabling her to infiltrate the group traveling with Coud Van Giruet and Reverie Metherlence without raising suspicion. Created as an artificial Edel Raid by the organization Chaos Choir, her mission is to spy on the group and specifically target Ren.

During her time embedded with them, Viro develops conflicted loyalties. She forms a genuine attachment to Coud due to his kindness, causing her to hesitate in fulfilling her mission. This internal struggle culminates in her openly confessing her feelings for Coud. However, his reaffirmed commitment to Ren leaves her heartbroken. In combat, she reacts with Coud to transform into a large, bluish drill-like weapon attached to his right arm.

Her story concludes differently across media. In the anime, she sacrifices herself to protect Coud from an attack by Gladius, an act remembered and referenced by the characters later. The manga depicts a darker outcome: despite Rowen's attempts to save her and his confession of romantic feelings, she betrays the party. She disintegrates into dust after her core stone shatters. During this disintegration, she reveals that "Viro" is a designation for all human women implanted with artificial Elemental Gelades, not her personal name. The manga also discloses her saliva is poisonous to other Edel Raids.