Adding on a couple of the other characters: The Schofield Kid and Delilah. The kid believed all the outlaw stuff until he tried to do it, and pretended to be one until he actually became one.
The Schofield Kid : That was the first one.
Will Munny : First one what?
The Schofield Kid : First one I ever killed
.Will Munny : Yeah?
The Schofield Kid : You know how I said I shot five men? It weren't true. That Mexican that come at me with a knife, I just busted his leg with a shovel. I didn't kill him or nothing, neither.
Will Munny : Well, you sure killed the hell outta that fella today.
On the prostitute Delilah, she did one thing, and everything spun out of control. She laughed at the guy for having a small penis, he cuts her up. organized the other prostitutes to get the money to have the two cowboys killed (Delilah never took part in that.) She watches English Bob get beat to hell, William Munny get beat to hell, the guy that cut her and his friend get killed, Ned get killed, and finally her boss, the sheriff and several other men she knew get killed. You could see the anguish in her, knowing that because she laughed at the wrong time, a series of events started that spun out of control, and there was nothing she could do to stop it.