In the anime, Viluy is handed the task of gathering pure hearts after Tellu's death. She collects the pure hearts from the students using a supercomputer, controlled by her wristband. She overpowers Sailors Mercury, Uranus and Neptune using nano machines controlled by her wristband. Sailor Moon damages Viluy's wristband and the Witch ends up being consumed when her Mosaic Buster rebounded on her.
Viluy also appears in the stage musicals. She is voiced by Yoshino Takamori in the original anime and by Rina Hon'izumi in Crystal. In the Cloverway Inc. English adaptation, her names were changed to "Byruit" and "Julie Bidoh" and is voiced by Daniela Olivieri. In the Viz Media English adaptation, she is voiced by Julie Ann Taylor (as name of 'Cricket Brown'). In the musicals, she is played by Nao Futatsugi, Yuka Kuwahara and Yui Hasegawa.