Praxina and Mephisto (more commonly known as The Twins) are the main antagonists in the animated series LoliRock (aside from Gramorr) and its comic book adaptation. They were biological twins from the planet Ephedia who were sent to Earth to steal the Oracle Gems and destroy the Princesses. Praxina is voiced by Kelly Sheridan, and Mephisto is voiced by Vincent Tong.