I'd like to use this window of opportunity to give props to whomever created David; TLOU's antagonist. Fiendishly polite, charmingly creepy and surprisingly resourceful. Dangerous. You get all that established in a span of five minutes, and all his worst atrocities are left to your own imagination. Look at the clip below to get a feeling of what I mean.
Edit: Had Abby had but a smidgen of characterization (beyond being a buff busy-body), I wouldn't mind playing as her. But, as it stands, she seems like a filler character made solely to advance the plot in general and to kill Joel in particular.