I do know of one Gilgamesh swap but he's rigged over Firion though which IMO isn't a good fit for the King of Heroes. I'll make a replay later and you can judge for yourself.
Yeah, I agree, Firion really isn't a good fit for Gil at all. The way he moves and scamper around, such rolling around are bellow one such as THE KING.
...
Okay, the only character I can think of whose fighting style fit is actually Ultimecia.
So the Servant character is going to be Nero then? The Trailer isn't available in my country, so do we know who the Master is going to be? Or which route they'll use?
I don't really mind this all that much. Fate/EXTRA has an interesting story and hopefully this means that they'll eventually get to animating Tamamo's route.