Gavinmad
Mr. Poopybutthole
I really hope this Gilgamesh trial is as cutting edge as everyone is making it sound, because until this point, everything in game is trivialized by one single whale'ed dps unit, whether it's your own or a friends.
If Gilgamesh truly is "an hour+ long marathon fight" like JP players say, then Emperor (along with Olives -50% fire debuff) will actually be insanely good, dealing 3000% damage per round for free (he out-regens the cost), assuming he doesn't die to AoE damage because mage. If the people on reddit are full of shit and Gilgamesh dies in 5 rounds to whaled dps like all content so far, then team comp will matter a lot less.
My first Gilgamesh kill took me about 3 hours iirc. Most of that was a mix of my party not being very well optimized for the fight and me constantly stopping to read other stuff, but you also lose a huge amount of damage without a 6th party member. He really does have absurdly high defensive stats, I think people are going to be in for a rude awakening when they find out how much sustain you actually need to keep going if a fight lasts longer than 4-5 turns.
It's also incredibly likely that he will be buffed for GL. My guess is that he gets another 500k/1m hps.