One of the Servants in Fate/Zero, being one of the multiple persona that the male Assassin created, but with a female build. Known as "Hassan of the Hundred Faces" in Fate/Grand Order. This particular persona tends to be the gestalt's primary spokesperson, going by the nickname Asako.
Please note that Female Assassin is NOT a genderswap of Assassin.
This tag implicates assassin_(fate/zero) (learn more).