Man, I'd hate for us to turn out evil. I can't even think of a reason for it to happen to us, like if we were to we start out as well-intentioned extremists that get progressively worse. We're a bunch of mostly-good-at-heart soldiers and mercenaries just trying to earn a living and are more than eager to be rid of this current job.
Supported. I am quite sure if they knew what they were doing they would give up right away. And Tantallos would probably punch himself for the rest of his life for killing the wrong ones.
You know, I have a morbid curiosity to see the reactions of all our characters if we just blew up the world, caused a doomsday, or killed TONS of innocents by accident or something.
Seyena would have a BSOD, right then and there, just completely shut down.
What about everyone else? How would your character react?
Gregor would...probably react the same way, at least at first. What happens after that would rely on the circumstances behind our moment of infamy. If, for example, we were manipulated or lied to, he'd be determined to hunt the person responsible down and reveal the person's crime.
Remember, he just had a minor BSOD because of the events immediately before this battle, so if something terrible occurred and he felt himself responsible...he might not recover without serious help.