" EMIYA  "

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Originally, he was not a Heroic Spirit.
An individual who murdered many people as an assassin, but his existence has not been carved in the Throne of Heroes.
A "mock Heroic Spirit" also called guardian, and someone who does not exists in the proper human history.
This "if that might have been possible" exists only due the threat that attempts to destroy human history itself from its very foundation... in the Grand Order case alone.