Ernesta Kühne (エルネスタ・キューネ) is a student of Arlequint Academy and the head of the Pygmalion Faction.
Ernesta has light chestnut hair that is held in a ponytail, and "almond-shaped" sea green eyes. She wears what appears to be two large clips near her ponytail. She wears the uniform top of Arlequint Academy, black shorts, thigh high boots, and a lab coat.
Ernesta is shown to be peppy intellectual who enjoys a challenge, has a dark sense of humor, and is quite manipulative. She likes toying with her opponents as well as with her research subjects, giving them handicap without hesitating just for the fun of it.
After Silas's defeat, it is revealed that she was the one who had employed him.
High Intelligence: Ernesta is incredibly intelligent and has an exceptional talent for researching and creating puppets. She entered two puppets, AR-D and RM-C, that she developed alongside Camilla Pareto into the Phoenix which placed second overall.
Genestellar (星脈世代): As a Genestellar, Ernesta has enhanced physical ability and an aura known as prana.
- According to the author, Ernesta's birthday is October 31st, her horoscope is Scorpio, and her blood type is AB.