...Lilith, he's a hot mess. It's my personal head canon that he's not irredeemable, but if she knows a way to reform sociopaths (and he is, canonly, diagnosed with anti-social personality disorder, so it's serious business), I'm sure the entire psychological community would call her a saint, too.

More immediately effective involving Brian, anyway. xD He's... yeah, if someone aside from Dexter seems to care about him too much, he'll flip and try to push them away in the most violent means possible.