Talk:Lady Reines Case Files/@comment-27904100-20190429143322/@comment-32856683-20190429160458

Since the question is about the Pseudoservants we can summon (as opposed to Demiservants where a Heroic Spirit is grafted onto a living human), they went out of their way to explain it in the case of Ishtar:

Yes, they are for intents and purposes Servants with a magical body. In Babylonia it is mentioned that when summoning Ishtar, she randomly grabbed a compatible human from a random timeline and had the idea of that personan while possessed by herself summoned into the Servant vessel in order to game the system that usually wouldn't allow gods. It is distinctly not a real person from the Chaldea universe who gets possessed.

The best other example would be Lord El-Melloi II in the Fate/Zero collab. He remembers the events of Fate/Zero despite them never happening in the FGO timeline thanks to Olga Maria's dad winning the Third Grail War and the Grail never getting tainted in the first place. Therefore Zhuge Liang must have grabbed this version of El-Melloi from the main timeline.