The Servant's True Name is unknown.
A cherubic young girl dressed in exotic clothing. Her arms and legs are prosthetic limbs, and she has rainbow eyes.
The Boy Among the Stars
Nostalgic City Shinjuku
Erice runs into the girl while she is shopping and pretending to be a normal human.
She flooded the upper levels of the Colosseum with seawater, and was able to make both her and Anubis disappear with the water as well, their figures collapsing into splashes. She can also create water clones of herself and Anubis.
Her prosthetic limbs can transform into snakes.
She is also able to conceal her presence entirely, making her completely undetectable even when she's walking around in the open and appearing as a normal girl shopping. Erice assumes she does this via a Noble Phantasm, as it is too perfect to be magecraft.
- Fate/Requiem Volume 1: The Boy Among the Stars - Chapter 7