Princess of the Crystal is a mysterious and regal figure in the anime series Mawaru Penguindrum. She appears as an alter ego of Himari Takakura after a fateful encounter with a magical penguin hat. Commanding the Takakura brothers to seek the elusive Penguindrum, she acts as both guide and manipulator, driving the plot's central quest. Her enigmatic presence, flamboyant personality, and cryptic motivations add layers of intrigue, blurring the line between reality and fantasy within the series.