The Romantic fiction of Typemoon or rather the Romantic fiction that Nasu Kinoko is writing for Typemoon is often thought as "all in the same world," but it is fundamentally separated into two large groups that I have only hinted at.
There are the Fate worlds where Heroic Spirits are used a Servants and Tsukihime worlds where, dude, there's no way a mighty concept like a Heroic Spirit can be squeezed into an "autonomous familiar."
The difference is that the groundwork for Fate worlds thought of as "things that affirm human history" so Servants playing the leading roles; whereas the groundwork for Tsukihime worlds are "things that ■■ human history" so the leading role is played by the antagonists, Dead Apostles.
Therefore, in regards to a character in Tsukihime... the one the Church counts as part of the twenty seven ancestors.... became a powerful Dead Apostle after "an encounter."
However, in the Fate World, this "encounter" never happened in the first place, so while he became a Dead Apostle he never obtained the same level of power as the "one who was counted as an ancestor" and his mystery was deteoriated.
With these differences... the basis of the world is the same but the conditions are different so the characters are also different... I'm happy if you liked it.
"Grandpa, what about "Fake"? How does that random potluck work? That's been on my mind!"
"Hohohoho, well Hero Mashiro-chan who got Chacha to lv 80 in half a day after perma-ing her, the answer is "it's got both.""
"It's got both? So like if in Chou-han you called both odd and even? So that means,"
"Yes, Mahiro-chan who's Ilya and Kuro are level 100, it's therefore neither, one could say it's like a "FGO-like world." Like I expected, you a true hero. Take care of yourself once in a while okay?