I never listened to what the bosses said, unfortunately (in the cutscenes, yes, but I couldn't hear what they said at the beginning of the fights because the music was over it so much). Then I beat them up and tried to hear what they said when they died, but sometimes I still couldn't hear. But hey, The Last Hope was a good game with great characters and entertaining boss fights. I look at the game every now and again and I realize Meracle's outfit it a whole lot more skimpy than Myuria's. Seriously; compare the two.
The Apostle of Creation had some pretty cool lines.
"I am the mouth piece of all life, all worlds, all existence!" and "Witness the quintessence of my catastrophic powers!"
I remember really liking the main boss music and the bonus boss music, "I do therefore I am" and "incarnation of the devil (next-gen remix) respectively. I admit, I liked fighting Gabriel Celeste but with Ethereal Queen, the shit you have to go through to get to her takes all the fun out of the fight. She herself spams Divine Wave constantly too.