I agree with everyone who says Herry is going to be the most bitter. Even now he acts bitter about what everybody does around the house, while he's still there, and its only going to get worse when he's evicted. I think the bitterness will stem from three things: a sense of entitlement, a lack of self awareness (both of which has been mentioned by everyone here), and an angry temper. He seems to explode very easily, and it could take one little thing to get him going, and sometimes he just doesn't stop.

The least bitter: Libra. I never really liked, and wanted her out of the house badly, but she seems to have a good head on her shoulders, and knew that what she and everyone else was doing was part of the game.