User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-31726296-20170716021510/@comment-31726296-20170718155432

Yes Hitsuji Mamoru I am implying that Caster is Shirou in Ilya's body.

Also Heaven's Failure was based of the end of Heaven's Feel so maybe that is the reason why it sounds similar.

True Name Revealed: Emilya Von Einzber Aka Shirouko.

I hope you guys enjoy the sheet and concept!