Koyanskaya, also known as Tamamo Vitch, is a major antagonist in the mobile game Fate/Grand Order. She is a Beast-class servant who operates under the alias of NFF Services, a mysterious and powerful organization. With a cunning and manipulative personality, Koyanskaya often presents herself as a businesswoman, but she harbors a hidden agenda. Her true identity is linked to the Tamamo Nine, a group of kitsune, or fox spirits, with connections to the mythical Tamamo-no-Mae. Koyanskaya's role in the series involves complex schemes and alliances, making her a formidable opponent.