Nico, who was beaten by both his father, brother and teachers as kid because he never lived up to their expectations of him, then took to drinking as an escape. The drinking meant framing him for the murder of his family and the woman he loved was easy and belivable, to the extent that he himself believes it for a while. As a part of the frame up, he'd gotten the blood of his family and Adela all over his hands and clothes, and he is left sitting with that blood on him until Dina shows up. And that's just within the first 60 pages.
Rose, who gets beaten and blamed for everything by her Big Brother Bully and is ostracized for being illegetimate.
Dina, who is very lonely and has been friendless for years because almost no-one dare look her in the eyes.