What Larian did with Patch 2 was to suck out her vivacious and upbeat attitude and replace it with a somber, downer attitude that doesn't fit her at all.
I agree that keeping the drama is important, but it can't be at the expense of the character.
Wow, I guess you should be issued a formal apology from Karlach because her attitude shifted when faced with certain death. How dare she?! As the game is right now, she's dying. Maybe accept some mood changes? I dunno I'm not a relationship counsilor.