Prospera Mercury is the main antagonist of Mobile Suit Gundam the Witch from Mercury and the deuteragonist of its prologue. Formerly a Vanadis Institute test pilot named Elnora Samaya, she was forced into hiding after the institute was attacked and is currently the CEO of the Shin Sei Development Corporation. She was the loving mother of the Samaya family. The Vanadis Incident left her with a deep hatred for Delling Rembran, the president of the Benerit Group, who was responsible for ordering the attack as well as the "witch hunt" for all the Gundams. So great is this hatred that she is willing to use her own daughter to get close to Delling through the man's sole daughter, Miorine Rembran, under the ruse of letting her enjoy her life at school.