Calaveras is shown to be a petty woman who indulges in relentlessly teasing her other siblings, especially Petz. She also appears unwilling to do anything for herself. She never accepts a single mission and instead tags along on several of Petz' missions and also follows Petz on one occasion to steal credit for Berthier's final mission. Even her final mission is one of Petz', in which the elder sister was asked to use a powerful stick to kill the Sailor Senshi and her now purified siblings Cooan and Berthier. While on the mission, Calaveras urges Petz to go ahead and kill the other two girls, but Petz, corrupted by the stick, decides to kill all three of them. Shocked by Petz's betrayal, Calaveras is shown pity by Sailor Moon and eventually comes to understand human love. She then tells the other Sailor Senshi about the stick's power. When Rubeus arrives and uses the stick to create a time-vacuum on the bridge, Calaveras stops Petz from falling into the vortex by catching her using her whip. After the Sailor Senshi destroy the stick, Calaveras accepts purification and becomes a normal human woman.