The daughter of King Aeetes, holder of the Golden Fleece, she was taught Magecraft by the moon goddess Hecate. Taken from her country by the hero Jason, after a long, aimless journey, she was branded the Witch of Betrayal and left this world.

One of the two Koyanskayas split off during Lostbelt: Beast IV's investiture. Koyanskaya of Darkness. She's now more wicked than she was when posing as an apostle of the Alien God. She mocks the Human Order and is harsh on humanity. Her aspects as a Tamamo no Mae with no desire to be a good wife (ignore the point that she's not really Tamamo no Mae for a moment), a destroyer, and an evil (nature) spirit are stronger.

A mysterious Servant who appeared in Chaldea to celebrate the 6th anniversary, because she's a sensible woman who is always a step ahead of the game. An S-P-Y whose powers and charms remain shrouded in mystery. Anyone can tell at first glance that she's Koyanskaya, Chaldea's former enemy, but she's claiming she's no longer a Beast in the making, just a hypercompetent sexy secretary (of light), so...?

A happy-go-lucky space☆cheerleader who marches to the beat of her own drum, hailing from the Servant Universe. She loves anything new, and she never sweats the small stuff. How little does she care? Well, so little so that she tends to forget the grudges or debts made even a day ago. "Huh? You dropped your phone in that crevasse over there? Leave it to me! Let's start with explosives☆"