Calaveras

Calaveras is the second eldest of the four Ayakashi Sisters and an ally of Sailor Stellar's.

Bishoujo Senshi Sailor Moon R (Original Timeline)
Calaveras's only appearance was in Act 18, where her mission was to hypnotise the people of Tokyo that the White Moon will bring calamity upon Earth, entitling this plan "Operation Rebirth". She was killed by Sailor Moon.