My character is a "Goody two-shoes", an extreme one at that. My character is so disgustingly good that even the other good guys either think she's annoyingly good even by their standards or that she's simply... stupid. She always does good stuff, and she usually decline the reward if she can. I think there's only one time that she's ever done something that caused her karma to decrease. The rest of the time her karma has either remained the same or increased.
If I ever replay Fallout 3 though I'll probably play a character that's the opposite of my current character. He's going to be the fear of all the wasteland! *mohahahaha*
If I ever replay Fallout 3 though I'll probably play a character that's the opposite of my current character. He's going to be the fear of all the wasteland! *mohahahaha*