Hollywood Pudgy: The main characters have a running joke of calling the rail-thin Tom fat. Tom never understands the joke and is completely mystified by how they could think he's overweight. Even the narrator gets in on the joke by claiming that, for a thin man, Tom is extremely fat.
Lawful Neutral: Big Chris just does the job he is paid to do by Hatchet Harry, which happens to involve violent retrieval of money. He is fair to the protagonists, and even informs them of the true value of their guns. He is also not a sadist, and only loses his cool when Dog pushes his Berserk Button by threatening Little Chris.
Moral Event Horizon: The execution of the two drug dealers in Dog's first scene does it for him - they've already told him everything he wants to know, and are tied up, terrified, and begging for their lives. That earns them neither sympathy nor mercy. Even Dog's own crew, who are hardly saints themselves, disapprove of this.