ドッペル娘

A clone of Luka created by the pinnacle of Promestein's genetic engineering technology. But her gender isn't set, and can be switched between male and female at will. She was created using samples taken from Luka during the Wormiel fight, and has all of his memories and physical abilities from that time. When she takes a female form, her thinking and personality also changes to become more feminine. [From In-game Monsterpedia]