Viluy

Her animated design mirrors the one drawn for the comics. In daily life she passes through Mugen Academy as a brilliant student under her human name, giving no sign of the witch she really is.

She places her trust in computers and cold calculation above everything, and she holds nothing but contempt for Kaolinite, resenting how the older woman does little beyond flirting with Professor Tomoe, at one point even shoving her to the floor. Her faith rests wholly in her nanomachines, which she steers through the Nanocuff and her Mosaic Buster technique. That same devotion to machinery over the heart becomes the theme that seals her doom.

Her whole arc plays out over one episode. After matching Ami for the highest exam score, she rigs her master computer to drain the Pure Hearts of every student who sat the test. Sailor Mercury confronts her inside Mugen Academy, and Viluy's assault pulls in Haruka and Michiru, who transform into Sailor Uranus and Sailor Neptune. When the rest of the team arrives, Sailor Moon's Rainbow Moon Heartache damages the Nanocuff without Viluy noticing. She sets off her attack once more, but the wounded device turns the nanomachines against her; she frantically screams that they have the wrong quarry, to no effect. As she sinks to her knees, Sailor Mercury throws Viluy's own words about heartless machines back at her, and the Guardians look on in silence while the swarm devours her. Mercury retrieves the fallen cuff, remarks that trusting only computers and turning away from love earned Viluy her fate, and then the cuff crumbles too, leaving nothing behind. She stands out as the only member of her group neither slain by nor guilty of slaying a fellow witch.