User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-32599925-20170717034056/@comment-32599925-20170719205953

Gender-bended. The original is technically a shape-shifter stated to have almost no limits on his form (essentially letting the author and anyone else have free reign to insert him anywhere in the mythos) but his first appearance was as a foreign man of great power... something the author, a (very bigoted against foreigners, esp. immigrants) horror writer, probably feared very much.

The fact that the author described the inspiration coming from a vivid dream is what made me decide to link the above Servant to dream-walking and Kaleidoscope magic.

This is a case similar to that of Artoria, where it's: male literary character-> female Fate character, but in my Fate-ified backstory, it goes female individual->male character->female Servant... who's quite annoyed about how her original literary representation is utterly evil.

However, this won't be the first gender-bending of said character, as a relatively recent anime series did feature a female version. Thus, things might be a bit confusing if someone's seen some pop-culture representations of this character, but isn't aware of the source material.