User blog comment:ZokeiR/Possible Grand Servants/@comment-29543192-20170427211542

This is really out there but for Grand Caster, I think Tamamo no Mae might have a chance? I mean in FGO, she has only 3 of her 9 tails. She also is the incarnation of the God Amaterasu. Though this is just a Tamamo fan saying this, so favoritism shines the most here. lol

For Grand Berserker, who is the embodiment of madness, actually I thought of someone who might interestingly enough, fit this class very well. I think, Lovecraft. Yes, the authur. His liturature is about human madness. He is the first person to me besides a great warrior that comes to mind. I can't see him as being all that powerful as a fighter, but imagine him being a support Berserker though.

Also fun fact, the tentacles and other bizzare creatures like Lahmu in FGO actually fit his literature quite well.