Magus Sisters

The Magus Sisters are a running gag in the series. They are named Sandy, Cindy, and Mindy.

Final Fantasy IV
They first appeared as a boss in Final Fantasy IV at the top of the Tower of Zot, where they were minions to Valvalvis of the Air, one of the Four Fiends of the Elements. They would attack using their Delta Attack, in which Sandy would cast Wall on Cindy, and Mindy would use a level two spell or Virus on Cindy, reflecting it back on to Cecil's party.

Final Fantasy X
The Magus Sisters make an appearance as an Aeon that is found in Remiem Temple. To obtain them, the player must find the Flower Sceptre and the Blossom Crown and use them to open the back door of the Temple, where the sisters rest. Unlike most Aeons, they attack as three separate players. Their actions cannot be controlled. Sandy's special attack is called Razzia, Cindy's is called Camisade, and Mindy's is called Passado, which really does fifteen consecutive attacks. Their Overdrive is Delta Attack, and is only used when all three of their gauges fill up.